CN115933241A - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN115933241A
CN115933241A CN202110930429.0A CN202110930429A CN115933241A CN 115933241 A CN115933241 A CN 115933241A CN 202110930429 A CN202110930429 A CN 202110930429A CN 115933241 A CN115933241 A CN 115933241A
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China
Prior art keywords
display panel
liquid crystal
compensation film
polarizer
layer
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CN202110930429.0A
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Chinese (zh)
Inventor
石侠
郭远辉
郭磊
张培培
张维
杨晓光
黄晓宇
陈创
韩杰
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BOE Technology Group Co Ltd
Wuhan BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Wuhan BOE Optoelectronics Technology Co Ltd
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Priority to CN202110930429.0A priority Critical patent/CN115933241A/en
Priority to PCT/CN2022/110852 priority patent/WO2023016401A1/en
Publication of CN115933241A publication Critical patent/CN115933241A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising 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

Abstract

The embodiment of the present disclosure provides a display panel and a display device, the display panel including: the liquid crystal display panel comprises a first polarizer, a first liquid crystal panel, a second liquid crystal panel and a second polarizer which are sequentially stacked; wherein at least one of the first polarizer and the second polarizer is provided with an optical modulation structure, the optical modulation structure comprising: any one of an optical compensation film configured to change a polarization state of light obliquely incident to the optical compensation film and a microstructure configured to change a propagation direction of light incident to the microstructure.

Description

Display panel and display device
Technical Field
The embodiment of the disclosure relates to but not limited to the technical field of display, and particularly relates to a display panel and a display device.
Background
Liquid Crystal Display (LCD) panels have features such as small size, low power consumption, and no radiation, and have been rapidly developed in recent years. However, the double-layer display device is limited by the influence of factors such as pixel design, scattering of materials, process limitations, and the like, and the actual contrast loss of the current double-layer display device is serious.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
In a first aspect, an embodiment of the present disclosure provides a display panel, including: the liquid crystal display panel comprises a first polarizer, a first liquid crystal panel, a second liquid crystal panel and a second polarizer which are sequentially stacked; wherein at least one of the first polarizer and the second polarizer is provided with an optical modulation structure, the optical modulation structure comprising: any one of an optical compensation film configured to change a polarization state of a light ray obliquely incident to the optical compensation film, and a microstructure configured to change a propagation direction of the light ray incident to the microstructure.
In a second aspect, an embodiment of the present disclosure provides a display device, including: in the above embodiment, the display panel and the third polarizer are located between the first liquid crystal panel and the second liquid crystal panel, and the first liquid crystal panel includes: the liquid crystal display panel comprises a first array substrate, a first opposite substrate and a first liquid crystal layer, wherein the first array substrate and the first opposite substrate are oppositely arranged, and the first liquid crystal layer is arranged between the first array substrate and the first opposite substrate; the second liquid crystal panel includes: the liquid crystal display panel comprises a second array substrate, a second opposite substrate and a second liquid crystal layer, wherein the second array substrate and the second opposite substrate are oppositely arranged, and the second liquid crystal layer is arranged between the second array substrate and the second opposite substrate; wherein the content of the first and second substances,
the optical axis direction of liquid crystal molecules in the first liquid crystal layer is 0 degree;
the optical axis direction of liquid crystal molecules in the second liquid crystal layer is 0 degree;
the optical axis direction of the first polarizer is 90 degrees;
the optical axis direction of the second polaroid is 90 degrees;
the optical axis direction of the third polarizer is 0 degree.
The display panel and the display device provided by the embodiment of the disclosure can change the polarization state (polarization state) of oblique incidence light (side viewing angle light) through the optical compensation film arranged in at least one of the first polarizer and the second polarizer, so that the oblique incidence light cannot be emitted from the display panel in a dark state, the dark state brightness of the display panel can be reduced, and further, the contrast of the display panel can be improved. Or, the microstructure arranged by at least one of the first polaroid and the second polaroid can reduce the scattering phenomenon of light rays in the display panel, reduce the dark state brightness of the display panel and further improve the contrast of the display panel.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. Other advantages of the disclosure may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Other aspects will be apparent upon reading and understanding the attached drawings and detailed description.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure. The shapes and sizes of various elements in the drawings are not to be considered as true scale, but rather are merely intended to illustrate the present disclosure.
FIG. 1A is a schematic diagram of a dual-layer display device;
FIG. 1B is a schematic view of the absorption axis of the polarizer of the liquid crystal panel;
FIG. 1C is a schematic diagram of contrast distribution of a liquid crystal panel at different viewing angles;
FIG. 1D is a schematic diagram of analysis of different light contrasts;
fig. 2 is a schematic diagram of a first structure of a display panel in an exemplary embodiment of the disclosure;
FIG. 3 is a diagram illustrating a second structure of a display panel according to an exemplary embodiment of the disclosure;
fig. 4 is a schematic diagram of a third structure of a display panel in an exemplary embodiment of the present disclosure;
fig. 5 is a schematic diagram of a fourth structure of a display panel in an exemplary embodiment of the disclosure;
FIG. 6 is a schematic diagram of a fifth exemplary configuration of a display panel according to an exemplary embodiment of the disclosure;
fig. 7 is a schematic view of a sixth structure of a display panel in an exemplary embodiment of the present disclosure;
FIG. 8 is a schematic view of different orientations of an optical compensation film in an exemplary embodiment of the present disclosure;
fig. 9 is a schematic diagram of a seventh structure of a display panel in an exemplary embodiment of the disclosure;
fig. 10 is an eighth structural schematic diagram of a display panel in an exemplary embodiment of the present disclosure;
fig. 11 is a schematic structural view of a first microstructure in an exemplary embodiment of the disclosure;
fig. 12A is a first schematic structure of a second microstructure in an exemplary embodiment of the disclosure;
fig. 12B is a second schematic structure of a second microstructure in an exemplary embodiment of the disclosure;
fig. 13A is a schematic view of a ninth structure of a display panel in an exemplary embodiment of the present disclosure;
fig. 13B is a tenth structural schematic diagram of a display panel in an exemplary embodiment of the present disclosure;
fig. 13C is an eleventh structural diagram of a display panel in an exemplary embodiment of the disclosure;
fig. 14 is a schematic structural diagram of a display device in an exemplary embodiment of the present disclosure.
Description of reference numerals:
11-a first polarizer; 12-a first liquid crystal panel; 13-a second polarizer;
14-a second liquid crystal panel; 15-a third polarizer; 16-a first optical compensation film;
17-a second optical compensation film; 18-a third optical compensation film; 19-a first microstructure;
20-a second microstructure; 191-a first projection; 192-a first substrate layer;
193-first spaced apart regions; 201-a second projection; 202-a second substrate layer;
203-a second spacer region; 111-a first protective layer; 112-a first support layer;
113-a first polarizing layer; 114-a second support layer; 115-a first adhesive layer;
131-a second protective layer; 132-a fourth support layer; 133-a second polarizing layer;
134-a third support layer; 135-a second adhesive layer; 151-third adhesive layer;
152-fifth support layer; 153-a third polarizing layer; 154-sixth support layer;
30-a fourth adhesive layer; 40-a fifth adhesive layer; 161/171- + B type compensation film;
162/172- -type B compensation film; 121-a first array substrate; 122-a first opposing substrate;
123-a first liquid crystal layer; 141-a second array substrate; 142-a second opposing substrate;
143-a second liquid crystal layer; 144-color film layer.
Detailed Description
Various embodiments are described herein, but the description is intended to be exemplary, rather than limiting and many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the exemplary embodiments, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
In describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps herein, the method or process should not be limited to the particular sequence of steps. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present disclosure.
In the drawings of the present disclosure, the size of each constituent element, the thickness of a layer, or a region is exaggerated for clarity in some cases. Therefore, one mode of the present disclosure is not necessarily limited to the dimensions, and the shape and size of each component in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes, numerical values, and the like shown in the drawings.
In the exemplary embodiments of the present disclosure, ordinal numbers such as "first", "second", or "third" are provided to avoid confusion of constituent elements, and are not limited in number.
In the exemplary embodiments of the present disclosure, the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner" or "outer" and the like indicating the orientation or positional relationship are used for convenience to explain the positional relationship of the constituent elements with reference to the drawings, only for convenience of description and simplified description, and do not indicate or imply that the device or element referred to has a specific orientation, is configured and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction in which each constituent element is described. Therefore, the words described in the specification are not limited to the words described in the specification, and may be replaced as appropriate.
In the exemplary embodiments of the present disclosure, the terms "mounted," "connected," or "connected" are to be construed broadly unless otherwise explicitly specified or limited. For example, it may be a fixed connection, or a detachable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The meaning of the above terms in the present disclosure can be practically understood by those of ordinary skill in the art.
"about" in the disclosed embodiments refers to a numerical value that is not narrowly defined, but is within the tolerances allowed for the process and measurement.
In the embodiments of the present disclosure, "stacked in sequence" means that a plurality of film layers are stacked in one direction, but does not mean that the film layers are attached to each other two by two.
The main structure of the LCD includes a Thin Film Transistor (TFT) array substrate and a counter substrate of a CELL (CELL), liquid Crystal (LC) molecules are filled between the array substrate and the counter substrate, and an electric field for driving the Liquid Crystal to deflect is formed by controlling a common electrode and a pixel electrode, thereby realizing gray scale display. According to the display mode, the LCD can be classified into: a Twisted Nematic (TN) display mode, a Vertical Alignment (VA) display mode, an In Plane Switching (IPS) display mode, and an Advanced Super Dimension Switching (ADS) display mode, and the like. The ADS and the IPS belong to a horizontal electric field type display device, and have the advantages of wide viewing angle, high aperture ratio, high penetration rate, high resolution, high response speed, low power consumption, low chromatic aberration and the like. The BD Cell display technology can perform finer brightness adjustment in a submillimeter-order range by superimposing two liquid crystal panels together, using a Local backlight modulation (Local dimming) technology that divides the liquid crystal panel into millions of individual areas.
Fig. 1A is a schematic structural view of a Dual-layer display device, as shown in fig. 1A, which is a two-layer display panel attachment structure, and in a plane perpendicular to the display device (i.e., a third direction DR 3), the Dual-layer display device may include: the liquid crystal display panel comprises a first polarizer 11, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14 and a second polarizer 13 which are sequentially stacked. The first liquid crystal panel 12 may also be called a sub-display panel (sub-cell), and has no Color Filter (CF) layer; the second liquid crystal panel 14 may also be called a main display panel (main cell) and has a color film layer (not shown). The first polarizer 11, the second polarizer 13, and the third polarizer 15 are configured to control a polarization state of light. For example, the transmission axis of the first polarizer 11 is parallel to the transmission axis of the second polarizer 13, and the transmission axis of the third polarizer 15 is perpendicular to the transmission axes of the first polarizer 11 and the second polarizer 13.
As shown in the following equation (1), the contrast ratio CR of the dual-layer display device is defined as L255 (bright state) luminance of the dual-layer display device divided by L0 (dark state) luminance of the dual-layer display device, that is, the contrast ratio of the dual-layer display device is equal to the contrast ratio of the main display panel multiplied by the contrast ratio of the sub display panel. The contrast ratio of the measured single-layer ADS display panel is generally between 1000 and 2000, so the theoretical contrast ratio of the BD Cell can reach over a million level. However, actually, the contrast loss of the currently manufactured dual-layer display device is severe, which only reaches a hundred thousand levels and has a large difference from a theoretical value due to the influence of factors such as pixel design, scattering of materials, and process limitation.
Figure BDA0003210421240000061
In the formula (1), CR represents the contrast of the double-layer display device, br L255 L255 luminance, br, of a two-layer display device L0 Denotes L0 luminance, br, of a two-layer display device BLU Denotes the luminance, tr, of a backlight Unit (BLU) Sub-L255 Shows the L255 transmittance, tr, of the sub-display panel Sub-L0 Represents the L0 transmittance, tr, of the sub-display panel Main-L255 Represents the L255 transmittance, tr, of the main display panel Main-L0 Indicating the L0 transmittance of the main display panel.
The inventor of the present disclosure found that: for a dual-layer display device, the side-view angle light contrast has a large influence on the overall contrast, resulting in a contrast of only one hundred thousand levels in the current dual-layer display device. The reason why the contrast ratio of the dual layer display device is low is analyzed with reference to the accompanying drawings.
As shown in fig. 1A, when the optical probe is perpendicular to the liquid crystal panel in the dual-layer display device, the light captured by the optical probe is theoretically a front-view angle light, and there should be no side-view angle light, but the optical probe captures a part of the side-view angle light due to the refraction effect and the total reflection effect inside the display panel.
As shown in fig. 1B and 1C, in the case of the liquid crystal panel in the dual-layer display device, light leakage may occur in the liquid crystal panel at a side view angle due to a non-vertical state of the absorption axis of the polarizer in the dual-layer display device at the side view angle. Wherein, in fig. 1B, the left side shows a state of an absorption axis of the polarizer under a front viewing angle, and the right side shows a state of the absorption axis of the polarizer under a side viewing angle; in fig. 1C, the contrast levels are illustrated by colors of different gray scales, the left circular area in fig. 1C represents the contrast distribution of the panel at different viewing angles, the numerical values around the circular area represent different viewing angles, and the unit is degree, and the right rectangular area in fig. 1C represents the corresponding contrast levels by colors of different gray scales, as illustrated by the contrast of the liquid crystal panel in the two-layer display device being between 0 and 1187.
As shown in fig. 1D, the light ray 1 is a collimated light ray which is emitted by the backlight module and is perpendicular to the liquid crystal panel, the light ray 2 is an oblique light ray (side view angle light ray) which is emitted by the backlight module and has a certain angle with the liquid crystal panel, the distances traveled by the light ray 1 in one liquid crystal panel are D1, and the distances traveled by the light ray 2 in one liquid crystal panel are D2. As shown in the following formula (2), the L0 brightness of the liquid crystal panel is proportional to the scattering coefficient of the liquid crystal, i.e., the larger the scattering coefficient of the liquid crystal, the higher the L0 brightness, and the lower the contrast. It can be seen that the longer the path that the light ray travels in the liquid crystal, the greater the brightness of L0, and the lower the contrast, i.e. the contrast of light ray 2 is lower than that of light ray 1. The light emitted by the backlight module or the first liquid crystal panel (also referred to as a sub-display panel) has a certain proportion of light 1 and a certain proportion of light 2, and then the larger the proportion of light 2 is, the lower the contrast of the panel is.
Figure BDA0003210421240000071
In the formula (2), L0 Lum Indicating the L0 brightness of a liquid crystal panel, S indicating the scattering coefficient of liquid crystal, deff indicating the distance traveled by a light ray in a liquid crystal panel, Δ n indicating the difference between the refractive index of the liquid crystal for extraordinary ray e and the refractive index of the liquid crystal for ordinary ray o, n e Denotes the refractive index, n, of the liquid crystal to the extraordinary ray e 0 The index of refraction of the liquid crystal with respect to the ordinary ray o light, K the elastic constant of the liquid crystal, and oc the direct ratio.
The disclosed embodiment provides a display panel, which may include: the liquid crystal display panel comprises a first polaroid, a first liquid crystal panel, a second liquid crystal panel and a second polaroid which are sequentially stacked; wherein, at least one in first polaroid and the second polaroid is provided with the optical modulation structure, and the optical modulation structure includes: any one of an optical compensation film configured to change a polarization state of light obliquely incident to the optical compensation film and a microstructure configured to change a propagation direction of light incident to the microstructure. So, the optical compensation film through at least one setting in first polaroid and the second polaroid can change the polarization state (polarization state) of the light (side view angle light) of oblique incidence for the light of oblique incidence can not follow display panel and jets out when dark state, can reduce display panel dark state luminance, and then, can promote display panel's contrast. Or, the microstructure arranged by at least one of the first polaroid and the second polaroid can reduce the scattering phenomenon of light rays in the display panel, reduce the dark state brightness of the display panel and further improve the contrast of the display panel. For example, the inventors of the present disclosure have found through experiments that the ratio of side view angle light rays (e.g., light ray 2) can be reduced, the ratio of collimated light rays (e.g., light ray 1) can be increased, the contrast of the display panel can be increased to 20 ten thousand or more, and a high-contrast display panel can be realized.
In an exemplary embodiment, the display panel may further include: and the third polaroid is positioned between the first liquid crystal panel and the second liquid crystal panel. For example, the third polarizer may be provided with an optical compensation film. For example, the optical compensation film may include: one compensation film or two compensation films.
In one exemplary embodiment, the first polarizer may be provided with an optical compensation film. For example, the optical compensation film may include: one compensation film or two compensation films.
In one exemplary embodiment, the second polarizer may be provided with an optical compensation film. For example, the optical compensation film may include: one compensation film or two compensation films.
In one exemplary embodiment, both the first and second polarizing plates may be provided with an optical compensation film. For example, the optical compensation film may include: one compensation film or two compensation films. Therefore, the optical compensation film can change the polarization state (polarization state) of the oblique incidence light (side viewing angle light), so that the oblique incidence light cannot be emitted from the display panel in the dark state, the dark state brightness of the display panel can be reduced, and the contrast of the display panel can be improved.
In one exemplary embodiment, the first polarizer may be provided with a first microstructure, and the first microstructure may include: and the first convex parts are arranged at intervals, wherein the cross section of each first convex part is rectangular in a plane perpendicular to the display panel. For example, the first microstructures are configured to collimate light emitted from the backlight module, so that the proportion of oblique light can be reduced, and the proportion of collimated light is increased. Thereby, can reduce the scattering phenomenon of light in display panel inside, can reduce the side view angle light leak that the polaroid leads to, can reduce display panel dark state luminance, and then, can promote display panel's contrast.
In one exemplary embodiment, the second polarizer may be provided with a second microstructure, and the second microstructure may include: and a plurality of second convex parts arranged at intervals, wherein the cross-sectional shape of the second convex parts is a triangle, a part of a circle or a part of an ellipse on a plane perpendicular to the display panel. So, the second microstructure can be configured to and disperses second liquid crystal panel outgoing light, can avoid side-looking at the angle luminance and hang down on the side, is favorable to the homogenization of second liquid crystal panel outgoing light to, can not influence display panel's luminance distribution under the different visual angles, can promote display effect.
In one exemplary embodiment, the first polarizer may be provided with a first microstructure, and the second polarizer may be provided with a second microstructure. Wherein the first microstructure may include: and a plurality of first convex parts arranged at intervals, wherein the cross-sectional shape of the first convex parts is rectangular in a plane perpendicular to the display panel. The second microstructure may include: and a plurality of second convex parts which are arranged at intervals, wherein the cross section of the second convex parts is a triangle, a part of a circle or a part of an ellipse on the plane which is vertical to the display panel.
In the exemplary embodiment of the present disclosure, the first direction DR1 may be a row direction, the second direction DR2 may be a column direction, and the third direction DR3 may be a light emitting direction of the display panel, a thickness direction of the display panel, a direction perpendicular to a plane of the display panel, or the like. The first direction DR1 intersects the second direction DR2, and the first direction DR1 intersects the third direction DR 3. For example, the first direction DR1 and the second direction DR2 may be perpendicular to each other, and the first direction DR1 and the third direction DR3 may be perpendicular to each other.
The following is a display panel including: first polaroid, first liquid crystal display panel, third polaroid, second liquid crystal display panel and the second polaroid of establishing superpose in proper order are the example to use the optics modulation structure to include: the structure of the display panel provided by the embodiments of the present disclosure is described with reference to the drawings.
Fig. 2 is a first schematic structural diagram of a display panel in an exemplary embodiment of the disclosure, fig. 3 is a second schematic structural diagram of the display panel in the exemplary embodiment of the disclosure, fig. 4 is a third schematic structural diagram of the display panel in the exemplary embodiment of the disclosure, fig. 5 is a fourth schematic structural diagram of the display panel in the exemplary embodiment of the disclosure, fig. 6 is a fifth schematic structural diagram of the display panel in the exemplary embodiment of the disclosure, and fig. 7 is a sixth schematic structural diagram of the display panel in the exemplary embodiment of the disclosure. In fig. 2 to 5, the first polarizer 11 and the second polarizer 13 are illustrated as being provided with optical compensation films (for example, the first polarizer 11 is provided with the first optical compensation film 16, and the second polarizer is provided with the second optical compensation film 17); in fig. 6, the second polarizer 13 and the third polarizer 15 are illustrated as being provided with optical compensation films (for example, the second polarizer 13 is provided with the second optical compensation film 17, and the third polarizer 15 is provided with the third optical compensation film 18); in fig. 7, the first polarizer 11 and the third polarizer 15 are illustrated as being provided with optical compensation films (for example, the first polarizer 11 is provided with the first optical compensation film 16, and the third polarizer 15 is provided with the third optical compensation film 18).
In an exemplary embodiment, as shown in fig. 2, 3, and 7, the first optical compensation film 16 may be disposed on a side of the first polarizer 11 away from the first liquid crystal panel 12. Alternatively, as shown in fig. 4 and 5, the first optical compensation film 16 may be disposed on a side of the first polarizer 11 close to the first liquid crystal panel 12. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, as shown in fig. 2, 4 and 6, the second optical compensation film 17 may be disposed on a side of the second polarizer 13 away from the second liquid crystal panel 14. Alternatively, as shown in fig. 3 and 5, the second optical compensation film 17 may be disposed on a side of the second polarizer 13 close to the second liquid crystal panel 14. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the third optical compensation film 18 may be disposed on a side of the third polarizer 15 close to the second liquid crystal panel 14. Alternatively, as shown in fig. 6 and 7, the third optical compensation film 18 may be disposed on a side of the third polarizer 15 close to the first liquid crystal panel 12. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, as shown in fig. 2, the display panel may include: the liquid crystal display panel comprises a first optical compensation film 16, a first polarizer 11, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14, a second polarizer 13 and a second optical compensation film 17 which are sequentially stacked along a third direction DR3 (i.e. the light emitting direction of the display panel). Here, in fig. 2, it is illustrated that the first optical compensation film 16 is disposed on the side of the first polarizer 11 away from the first liquid crystal panel 12, and the second optical compensation film 17 is disposed on the side of the second polarizer 13 away from the second liquid crystal panel 14.
In an exemplary embodiment, as shown in fig. 3, the display panel may include: the liquid crystal display panel includes a first optical compensation film 16, a first polarizer 11, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14, a second optical compensation film 17, and a second polarizer 13, which are sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel). Here, in fig. 3, it is illustrated that the first optical compensation film 16 is disposed on the side of the first polarizer 11 away from the first liquid crystal panel 12, and the second optical compensation film 17 is disposed on the side of the second polarizer 13 close to the second liquid crystal panel 14.
In an exemplary embodiment, as shown in fig. 4, the display panel may include: the liquid crystal display panel comprises a first polarizer 11, a first optical compensation film 16, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14, a second polarizer 13 and a second optical compensation film 17 which are sequentially stacked along a third direction DR3 (i.e., the light emitting direction of the display panel). Here, in fig. 4, it is illustrated that the first optical compensation film 16 is disposed on the side of the first polarizer 11 close to the first liquid crystal panel 12, and the second optical compensation film 17 is disposed on the side of the second polarizer 13 far from the second liquid crystal panel 14.
In an exemplary embodiment, as shown in fig. 5, the display panel may include: the liquid crystal display panel comprises a first polarizer 11, a first optical compensation film 16, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14, a second optical compensation film 17 and a second polarizer 13 which are sequentially stacked along a third direction DR3 (i.e., the light emitting direction of the display panel). Here, in fig. 5, it is illustrated that the first optical compensation film 16 is disposed on the first polarizer 11 on the side close to the first liquid crystal panel 12, and the second optical compensation film 17 is disposed on the second polarizer 13 on the side close to the second liquid crystal panel 14.
In an exemplary embodiment, as shown in fig. 6, the display panel may include: the liquid crystal display panel comprises a first polarizer 11, a first liquid crystal panel 12, a third optical compensation film 18, a third polarizer 15, a second liquid crystal panel 14, a second polarizer 13 and a second optical compensation film 17 which are sequentially stacked along a third direction DR3 (i.e. the light emitting direction of the display panel). Here, in fig. 6, it is illustrated that the second optical compensation film 17 is disposed on a side of the second polarizer 13 far from the second liquid crystal panel 14, and the third optical compensation film 18 is disposed on a side of the third polarizer 15 close to the first liquid crystal panel 12.
In an exemplary embodiment, as shown in fig. 7, the display panel may include: the liquid crystal display panel comprises a first optical compensation film 16, a first polarizer 11, a first liquid crystal panel 12, a third optical compensation film 18, a third polarizer 15, a second liquid crystal panel 14 and a second polarizer 13 which are sequentially stacked along a third direction DR3 (i.e., the light emitting direction of the display panel). Here, in fig. 7, the first optical compensation film 16 is disposed on the side of the first polarizer 11 away from the first liquid crystal panel 12, and the third optical compensation film 18 is disposed on the side of the third polarizer 15 close to the first liquid crystal panel 12.
In one exemplary embodiment, the optical compensation film may include: one layer of compensation film and two layers of compensation film. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, an optical compensation film includes: one layer of the compensation film is taken as an example, and the one layer of the compensation film can be a + B type compensation film (also called a positive B type compensation film). Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, an optical compensation film includes: a layer of compensation film, and a layer of compensation film comprising: the + B type compensation film is exemplified, and the thickness of the + B type compensation film may be about 100 micrometers (μm) to 150 μm in the thickness direction of the display panel (i.e., the third direction DR 3). For example, the thickness of the + B type compensation film may be about 130 μm or 138 μm, etc. Here, the thickness refers to a length characteristic along the third direction DR3 (i.e., the light outgoing direction of the display panel, the Z-axis direction). The embodiments of the present disclosure do not limit this.
In one exemplary embodiment, an optical compensation film includes: a layer of compensation film, and a layer of compensation film comprising: the + B type compensation film is exemplified, and at this time, the + B type compensation film may have a refractive index satisfying the following inequality: nx > ny > nz, 0.001 yarn-woven fabric nx-ny <0.004, and 0 yarn-woven fabric ny-nz <0.05; as shown in fig. 8, nx is a refractive index of the compensation film in a direction of an X axis (which may also be referred to as a fast axis), ny is a refractive index of the compensation film in a direction of a Y axis (which may also be referred to as a slow axis) perpendicular to the X axis, nz is a refractive index of the compensation film in a direction of a Z axis (i.e., a thickness direction), the Y axis is perpendicular to the X axis, and the Z axis is perpendicular to the Y axis and the X axis. For example, the refractive indices in a single direction may each be between about 1.3 and 1.6, i.e., nx may have a value between about 1.3 and 1.6, nz may have a value between about 1.3 and 1.6, and ny may have a value between about 1.3 and 1.6. Here, the embodiment of the present disclosure does not limit this.
For example, an optical compensation film includes: when the + B type compensation film is set to a thickness of about 100 μm to 150 μm, for example, when the + B type compensation film is set to a thickness of about 138 μm, the refractive index of the + B type compensation film satisfies 0.001 and n x-ny <0.004, it is possible to ensure that a compensation phase difference Re = (nx-ny) = d between 190nm and 390nm (i.e., half wavelength of visible light), where d represents the compensation film thickness. And the refractive index of the + B type compensation film satisfies 0-ny-nz <0.05, which can ensure better viewing angle effect.
In one exemplary embodiment, an optical compensation film includes: for example, two compensation films may include: and a + B type compensation film and a-B type compensation film (also called as a negative B type compensation film) which are stacked, wherein in the two layers of compensation films, the + B type compensation film is positioned on one layer of the first polaroid close to the first liquid crystal panel or one layer of the second polaroid close to the second liquid crystal panel. For example, taking the case where the first polarizer is provided with two compensation films, the + B type compensation film is located on one of the two compensation films relatively close to the first liquid crystal panel. For example, taking the second polarizer provided with two compensation films, the + B type compensation film is located on one of the two compensation films relatively close to the second liquid crystal panel. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the optical compensation film may include: two layers of compensation films, and the two layers of compensation films comprise: the + B type compensation film and the-B type compensation film are stacked as an example, the thickness of the + B type compensation film may be about 1 μm to 10 μm in the thickness direction of the display panel (i.e., the third direction DR 3), for example, the thickness of the + B type compensation film may be about 6 μm, etc.; the thickness of the B-type compensation film may be about 15 μm to 25 μm, for example, the thickness of the B-type compensation film may be about 18 μm or 25 μm, etc. Here, the thickness refers to a length characteristic along the third direction DR3 (i.e., the light outgoing direction of the display panel, the Z-axis direction). Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, an optical compensation film includes: two-layer compensation film, and two-layer compensation film includes: the + B type compensation film and the-B type compensation film are stacked as an example, and at this time, the + B type compensation film may have a refractive index satisfying the following inequality: nx > ny > nz, 0.001 yarn-woven fabric nx-ny <0.004, and 0 yarn-woven fabric ny-nz <0.05, the-B type compensation film may have a refractive index satisfying the following inequality: ny < nx < nz, 0.002 are woven into nx-ny <0.004 and nz-ny >0; as shown in fig. 8, nx is a refractive index of the compensation film in the X-axis (also referred to as a fast axis), ny is a refractive index of the compensation film in the Y-axis (also referred to as a slow axis) perpendicular to the X-axis, nz is a refractive index of the compensation film in the Z-axis (i.e., a thickness direction), the Y-axis is perpendicular to the X-axis, and the Z-axis is perpendicular to the Y-axis and the X-axis. For example, the refractive indices in a single direction may each be between about 1.3 and 1.6, i.e., nx may have a value between about 1.3 and 1.6, nz may have a value between about 1.3 and 1.6, and ny may have a value between about 1.3 and 1.6. Here, the embodiment of the present disclosure does not limit this.
For example, as shown in fig. 9, the first optical compensation film 16 may include: two compensation films, and the second optical compensation film 17 may include two compensation films, and the two compensation films include a + B type compensation film and a-B type compensation film stacked as an example, one of the two compensation films of the first optical compensation film 16 relatively close to the first liquid crystal panel 12 is a + B type compensation film, the other of the two compensation films of the first optical compensation film 16 is a-B type compensation film, the one of the two compensation films of the second optical compensation film 17 relatively close to the second liquid crystal panel 14 is a + B type compensation film, and the other of the two compensation films of the second optical compensation film 17 is a-B type compensation film. Here, in fig. 9, it is illustrated that the first optical compensation film 16 is disposed on a side of the first polarizer 11 away from the first liquid crystal panel 12, and the second optical compensation film 17 is disposed on a side of the second polarizer 13 away from the second liquid crystal panel 14. The embodiments of the present disclosure do not limit this.
In one exemplary embodiment, the optical compensation film may include: a compensation film prepared by stretching a polymer film or a copolymer film. The copolymer may be a copolymer of a plurality of polymers (e.g., a copolymer of two polymers), among others. For example, the polymer film may include: a cycloolefin Polymer (COP) film, a polymethyl methacrylate (PMMA) film, and a cellulose Triacetate (TAC) film. For example, the copolymer film may include, but is not limited to, a Cyclic Olefin Copolymer (COC) film. The embodiments of the present disclosure do not limit this.
In one exemplary embodiment, in fabricating an optical compensation film (e.g., a first optical compensation film, a second optical compensation film, or a third optical compensation film), the polymer film before stretching may be prepared by solution casting or melt extrusion or any other film forming technique known in the art. After the polymer film is obtained, a desired optical compensation film can be obtained by stretching the polymer film (for example, an optical compensation film having a refractive index satisfying the following inequality: nx > ny > nz is obtained). For example, taking the polymer film before stretching as a COP film as an example, the COP film may be stretched in a first direction and the cycloolefin polymer film may be stretched in a second direction different from the first direction to form a biaxially stretched cycloolefin polymer film, that is, an optical compensation film is produced.
The following are included in a display panel: first polaroid, first liquid crystal display panel, third polaroid, second liquid crystal display panel and the second polaroid of establishing superpose in proper order are for the example to it includes to use the optical modulation structure: the structure of the display panel provided by the embodiments of the present disclosure is described with reference to the drawings as an example.
Fig. 10 is an eighth structural diagram of a display panel in an exemplary embodiment of the disclosure, and in fig. 10, the first polarizer 11 and the second polarizer 12 are both provided with microstructures (for example, the first polarizer 11 is provided with a first microstructure 19, and the second polarizer 13 is provided with a second microstructure 20) for example. As shown in fig. 10, the display panel may include: the first microstructure 19, the first polarizer 11, the first liquid crystal panel 12, the third polarizer 15, the second liquid crystal panel 14, the second polarizer 13, and the second microstructure 20 are sequentially stacked along the third direction DR3 (i.e., the light emitting direction of the display panel).
In one exemplary embodiment, the first microstructure may include: and a plurality of first convex parts arranged at intervals, wherein the cross-sectional shape of the first convex parts is a rectangle (for example, a rectangle or a square) in a plane perpendicular to the display panel. For example, as shown in fig. 11, the first microstructure 19 may include: the first substrate layer 192 and the plurality of first protrusions 191 arranged at intervals on the first substrate layer 192 on the side close to the first liquid crystal panel 12 may be rectangular in cross section in a plane perpendicular to the display panel. So, through the first microstructure that first polaroid set up, can change the propagation direction of the light of incidenting to first microstructure, with the light collimation that backlight unit sent, can promote the collimation degree of the light through first liquid crystal display panel to, can reduce the scattering phenomenon of light at display panel inside, can reduce the oblique light proportion, can reduce display panel dark state luminance, and then, can promote display panel's contrast. Here, the embodiment of the present disclosure does not limit this. For example, the first substrate layer in the first microstructure and the substrate layer in the first polarizer may be shared, so that an adhesive such as Optical Clear Adhesive (OCA) may not be used to bond the two film layers, which is beneficial to thinning the display panel.
In one exemplary embodiment, the refractive index of the material of the first convex portion may be about 1.4 to 1.6. For example, the refractive index of the material of the first convex portion may be about 1.5. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, as shown in fig. 11, the filling material in the region around the first protrusion 191 (i.e., the first spacing region 193) in the first microstructure may be an air medium (wherein the refractive index of the air medium is about 1) or other low refractive index material. In this way, the refractive index of the filling material in the region around the first protrusion 191 (i.e., the first spacing region 193) in the first microstructure can be made smaller than the refractive index of the material of the first protrusion, so that the collimation effect of the first microstructure can be improved.
For example, as shown in fig. 11, since the plurality of first protrusions 191 are arranged at intervals, the first microstructure may include: a plurality of first protrusions 191 and a plurality of first spacer regions 193 alternately arranged, wherein the first spacer regions 193 may refer to regions around the first protrusions 191 in the first microstructure. In this manner, the refractive index of the material of first projection 191 is set to be larger than the refractive index of the filler material in first gap region 193. Then, a side view angle light ray (e.g., light ray L11) among light rays incident on first protrusion 191 may be totally reflected and propagated within first protrusion 191 until being collimated in a direction (i.e., third direction DR 3) close to first liquid crystal panel 12 along an interface between first protrusion 191 and first partition region 193, and a side view angle light ray (e.g., light ray L12) among light rays incident on first partition region 193 may be totally reflected and propagated within first protrusion 191 until being collimated in a direction (i.e., third direction DR 3) close to first liquid crystal panel 12 along an interface between first protrusion 191 and first partition region 193 after passing through first partition region 193 and the refracted light ray emitted after being incident on first protrusion 191. As can be seen, the first microstructures 19 can collect light, convert most of the light incident on the first microstructures 19 into collimated light, and collimate and emit the collimated light from the light emitting side (toward the direction close to the first liquid crystal panel 12) of the first microstructures 19. Therefore, since the first liquid crystal panel 12 is disposed on the light-emitting side of the first microstructure 19, the collimation of the light passing through the first liquid crystal panel 12 can be improved, the scattering phenomenon of the light inside the display panel can be reduced, the dark-state brightness of the display panel can be reduced, and the contrast of the display panel can be improved.
In one exemplary embodiment, the material of the first microstructure may include: any one or more of COP material, PMMA material and TAC material. For example, the material of the first base material layer may be a TAC material, the material of the first protrusion may be a PMMA material, and the filling material of the first spacing region may be an air medium. Therefore, the air medium is used as a low-refractive-index material to realize the collimation of light together with the first microstructure, and the collimation effect of the first microstructure on the light can be improved. The embodiments of the present disclosure do not limit this.
In an exemplary embodiment, the plurality of first protrusions may be arranged periodically along at least one of the first direction DR1 and the second direction DR 2. For example, the plurality of first protrusions may be arranged in an array. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, for example, in the case that the plurality of first protrusions are periodically arranged in at least one of the first direction DR1 and the second direction DR2, as shown in fig. 11, at least one of a distance d4 between adjacent first protrusions 191 in the first direction DR1 and a distance (not shown) between adjacent first protrusions 191 in the second direction DR2 may be about 4 micrometers to 6 micrometers, and the second direction DR2 crosses the first direction DR 1. For example, a pitch of adjacent first protrusions 191 in the first direction DR1 may be about 5 micrometers, and a pitch of adjacent first protrusions 191 in the second direction DR2 may be about 5 micrometers. Here, the embodiment of the present disclosure does not limit this. Herein, the pitch of the adjacent first protrusions 191 in the first direction DR1 may refer to a minimum distance between two adjacent first protrusions 191 in the first direction DR1, and the pitch of the adjacent first protrusions 191 in the second direction DR2 may refer to a minimum distance between two adjacent first protrusions 191 in the second direction DR 2.
In an exemplary embodiment, as shown in fig. 11, the thickness h2 of the first protrusion 191 may be about 5 to 20 micrometers in the thickness direction of the display panel (i.e., the third direction DR 3). For example, the thickness h2 of the first protrusion 191 may be about 5 μm, 6 μm, 10 μm, 15 μm, 20 μm, or the like. Here, the embodiment of the present disclosure does not limit this. Wherein, the thickness may refer to a length characteristic along the third direction DR 3.
In one exemplary embodiment, the width of the first protrusion may be approximately between 5 and 20 micrometers. For example, the width of the first convex portion may be about 5 μm, 6 μm, 10 μm, 15 μm, 20 μm, or the like. Here, the embodiment of the present disclosure does not limit this. Wherein, the width may refer to a length characteristic along the first direction DR 1.
In one exemplary embodiment, in the preparation of the first microstructure, TAC material having a refractive index of about 1.49 may be selected as the first substrate layer, a resin material (for example, PMMA material) having a thickness of about 20 μm is coated, embossed using a roller, and cured using UV (Ultraviolet) light. Thus, the first microstructure can be prepared.
In one exemplary embodiment, the second microstructure may include: and a plurality of second convex parts which are arranged at intervals, wherein the cross section of the second convex parts is a triangle, a part of a circle or a part of an ellipse on the plane which is vertical to the display panel. For example, as shown in fig. 12A and 12B, the second microstructure 20 may include: a second substrate layer 202 and a plurality of second protrusions 201 arranged at intervals on a side of the second substrate layer 202 away from the second liquid crystal panel, wherein, in a plane perpendicular to the display panel, the cross-sectional shape of the second protrusions 201 may be a triangle (as shown in fig. 12A), a part of a circle (as shown in fig. 12B), or a part of an ellipse. For example, the cross-sectional shape of the second protrusion 201 may include, but is not limited to, a regular triangle, an isosceles triangle, a semicircle, or the like. For example, the second protrusion 201 may include, but is not limited to, being a triangular pyramid, a portion of a sphere, or a portion of an ellipsoid, and the like. Therefore, the propagation direction of the light rays entering the second microstructure can be changed through the second microstructure arranged on the second polaroid, and the finally emergent light rays of the display panel can be dispersed. Therefore, the low brightness of the side viewing angle can be avoided, the light-emitting uniformity of the second liquid crystal panel is facilitated, the brightness distribution of the display panel under different viewing angles cannot be influenced, and the display effect can be improved. Here, the embodiment of the present disclosure does not limit this. For example, the second substrate layer in the second microstructure and the substrate layer in the second polarizer may be shared, so that the two films may be bonded without using an optical adhesive, which is beneficial to the lightness and thinness of the display panel.
In one exemplary embodiment, the refractive index of the material of the second convex portion may be about 1.4 to 1.6. For example, the refractive index of the material of the second convex portion may be about 1.5. The embodiments of the present disclosure do not limit this.
In an exemplary embodiment, as shown in fig. 12A and 12B, the filling material in the region around the second protrusion 201 (i.e., the second spacing region 203) in the second microstructure may be an air medium (where the refractive index of the air medium is about 1) or other low refractive index material. Here, the embodiment of the present disclosure does not limit this.
For example, as shown in fig. 12A and 12B, since the plurality of second protrusions 201 are arranged at intervals, the second microstructure may include: a plurality of second protrusions 201 and a plurality of second spacing regions 203, which are alternately arranged, wherein the second spacing regions 203 may refer to regions around the second protrusions 201 in the second microstructure. Thus, a part of the light (for example, the light L21) in the collimated light incident on the second protrusion 201 is refracted by the second protrusion 201, and becomes a side-view angle light, which is obliquely emitted from the second protrusion area 202, that is, the second microstructure can disperse the final emitted light of the display panel. Therefore, the low brightness of the side viewing angle can be avoided, the light-emitting uniformity of the second liquid crystal panel is facilitated, the brightness distribution of the display panel under different viewing angles cannot be influenced, and the display effect can be improved.
In one exemplary embodiment, the material of the second microstructure may be the same as the material of the first microstructure. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the material of the second microstructure may include: any one or more of COP material, PMMA material and TAC material. For example, the material of the second substrate layer may be a TAC material, the material of the second protrusion may be a PMMA material, and the filling material of the second spacing region may be an air medium. Therefore, the air medium is taken as a low-refractive-index material to diffuse light together with the second microstructure, and the diffusion effect of the second microstructure on the light can be improved. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, the plurality of second protrusions may be arranged periodically in at least one of the first direction DR1 and the second direction DR 2. For example, the plurality of second protrusions may be arranged in an array. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, taking the plurality of second protrusions as a periodic arrangement along at least one of the first direction DR1 and the second direction DR2, as shown in fig. 12A and 12B, at least one of a pitch d3 of adjacent second protrusions 201 along the first direction DR1 and a pitch (not shown) of adjacent second protrusions 201 along the second direction DR2 may be about 4 micrometers to 6 micrometers, and the second direction DR2 intersects the first direction DR 1. For example, a pitch of adjacent second protrusions 201 in the first direction DR1 may be about 5 micrometers, and a pitch of adjacent second protrusions 201 in the second direction DR2 may be about 5 micrometers. Here, the embodiment of the present disclosure does not limit this. Here, a pitch d3 of the adjacent second protrusions 201 in the first direction DR1 may refer to a minimum distance between two adjacent second protrusions 201 in the first direction DR1, and a pitch of the adjacent second protrusions 201 in the second direction DR2 may refer to a minimum distance between two adjacent second protrusions 201 in the second direction DR 2.
In an exemplary embodiment, as shown in fig. 12A and 12B, the thickness h1 of the second protrusion 201 may be about 5 to 20 micrometers in the thickness direction of the display panel (i.e., the third direction DR 3). For example, the thickness h1 of the second protrusion 201 may be about 5 μm, 6 μm, 10 μm, 15 μm, 20 μm, or the like. Here, the embodiment of the present disclosure does not limit this. Wherein, the thickness may refer to a length characteristic along the third direction DR 3.
In one exemplary embodiment, the width of the second protrusion may be approximately between 5 and 20 microns. For example, the width of the second convex portion may be about 5 μm, 6 μm, 10 μm, 15 μm, 20 μm, or the like. The embodiments of the present disclosure do not limit this. Wherein, the width may refer to a length characteristic along the first direction DR 1.
In one exemplary embodiment, in the preparation of the second microstructures, a TAC material having a refractive index of about 1.49 may be selected as the first substrate layer, a resin material (for example, a PMMA material) having a thickness of about 20 μm is coated, embossed using a roll, and cured using UV (Ultraviolet) light. Thus, the second microstructure can be prepared.
The structure of the polarizer in the display panel will be described with reference to the structure of the display panel shown in fig. 5.
Fig. 13A is a schematic diagram of a ninth structure of a display panel in an exemplary embodiment of the present disclosure, fig. 13B is a schematic diagram of a tenth structure of a display panel in an exemplary embodiment of the present disclosure, and fig. 13C is a schematic diagram of an eleventh structure of a display panel in an exemplary embodiment of the present disclosure. In fig. 13A, it is illustrated that the first optical compensation film 16 is disposed on a side of the first polarizer 11 close to the first liquid crystal panel 12, the second optical compensation film 17 is disposed on a side of the second polarizer 13 close to the second liquid crystal panel 14, the first optical compensation film 16 includes two compensation films, and the second optical compensation film 17 includes two compensation films; in fig. 13B and 13C, with the first optical compensation film 16 disposed on the side of the first polarizer 11 close to the first liquid crystal panel 12 and the second optical compensation film 17 disposed on the side of the second polarizer 13 close to the second liquid crystal panel 14, the first optical compensation film 16 includes: a layer of compensation film and the second optical compensation film 17 comprises a layer of compensation film are exemplified.
In an exemplary embodiment, as shown in fig. 13A, the display panel may include: the liquid crystal display panel comprises a first polarizer 11, a first optical compensation film 16, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14, a second optical compensation film 17 and a second polarizer 13 which are sequentially stacked along a third direction DR3 (namely the light emitting direction of the display panel). Wherein, the first polarizer 11 may include: a first protective layer 111, a first supporting layer 112, a first polarizing layer 113, a second supporting layer 114, and a first adhesive layer 115 sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel); the first optical compensation film 16 may include: a-B type compensation film 162 and a + B type compensation film 161 stacked in sequence along the third direction DR3 (i.e., the light emitting direction of the display panel). The second polarizer 13 may include: a second adhesive layer 135, a third supporting layer 134, a second polarizing layer 133, a fourth supporting layer 132 and a second protective layer 131 sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel); the second optical compensation film 17 may include: and a + B type compensation film 171 and a-B type compensation film 172 stacked in this order along the third direction DR3 (i.e., the light emitting direction of the display panel). Here, in the first optical compensation film 16, the-B type compensation film 162 is located on the side of the first adhesive layer 115 in the first polarizer 11 close to the first liquid crystal panel 12, and the + B type compensation film 161 is located on the side of the-B type compensation film 162 away from the first adhesive layer 115 in the first polarizer 11. Thus, the + B type compensation film 161 is one of the two compensation films relatively close to the first liquid crystal panel 12. In the second optical compensation film 17, the-B-type compensation film 172 is located on the side of the second adhesive layer 135 in the second polarizer 13 close to the second liquid crystal panel 14, and the + B-type compensation film 171 is located on the layer of the-B-type compensation film 172 far from the second adhesive layer 135 in the second polarizer 13. Thus, the + B type compensation film 171 is one of the two compensation films relatively close to the second liquid crystal panel 14.
In an exemplary embodiment, as shown in fig. 13B, the display panel may include: the liquid crystal display panel comprises a first polarizer 11, a first optical compensation film 16, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14, a second optical compensation film 17 and a second polarizer 13 which are sequentially stacked along a third direction DR3 (namely the light emitting direction of the display panel). Wherein, the first polarizer 11 may include: a first protective layer 111, a first supporting layer 112, a first polarizing layer 113, a second supporting layer 114 and a first adhesive layer 115 sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel); the first optical compensation film 16 may include: the + B type compensation film 161. The second polarizer 13 may include: a second adhesive layer 135, a third supporting layer 134, a second polarizing layer 133, a fourth supporting layer 132, and a second protective layer 131 sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel); the second optical compensation film 17 may include: the + B type compensation film 171. Here, the + B type compensation film 161 is located on the side of the first adhesive layer 115 in the first polarizer 11 near the first liquid crystal panel 12, and the + B type compensation film 171 is located on the side of the second adhesive layer 135 in the second polarizer 13 near the second liquid crystal panel 14.
In an exemplary embodiment, as shown in fig. 13C, the display panel may include: the liquid crystal display panel comprises a first polarizer 11, a first optical compensation film 16, a first liquid crystal panel 12, a third polarizer 15, a second liquid crystal panel 14, a second optical compensation film 17 and a second polarizer 13 which are sequentially stacked along a third direction DR3 (namely the light emitting direction of the display panel). Wherein, the first polarizer 11 may include: a first protective layer 111, a first supporting layer 112, a first polarizing layer 113, a second supporting layer 114 and a first adhesive layer 115 sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel); the first optical compensation film 16 may include: the + B type compensation film 161. The second polarizer 13 may include: a second adhesive layer 135, a third supporting layer 134, a second polarizing layer 133, a fourth supporting layer 132, and a second protective layer 131 sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel); the second optical compensation film 17 may include: the + B type compensation film 171. Here, the + B type compensation film 161 is located on the first adhesive layer 115 of the first polarizer 11 on the side close to the first liquid crystal panel 12, and the + B type compensation film 171 is located on the second adhesive layer 135 of the second polarizer 13 on the side close to the second liquid crystal panel 14. The third polarizer 15 may include: a third adhesive layer 151, a fifth supporting layer 152, a third polarizing layer 153, and a sixth supporting layer 154 sequentially stacked along the third direction DR3 (i.e., the light emitting direction of the display panel).
In an exemplary embodiment, as shown in fig. 13A to 13C, whether the first optical compensation film 16 is a compensation film or two compensation films, a fourth adhesive layer 30 may be disposed on the side of the + B type compensation film 161 close to the first liquid crystal panel 12, and the fourth adhesive layer 30 is configured to attach the first polarizer 11 provided with the first optical compensation film 16 and the first liquid crystal panel 12 together to form the liquid crystal light control structure.
In an exemplary embodiment, as shown in fig. 13A to 13C, whether the second optical compensation film 17 is a compensation film or two compensation films, a fifth adhesive layer 40 may be disposed on the side of the + B type compensation film 171 close to the second liquid crystal panel 14, and the fifth adhesive layer 40 is configured to attach the second polarizer 13 disposed with the second optical compensation film 17 and the second liquid crystal panel 14 together to form a liquid crystal display structure.
In an exemplary embodiment, the first polarizer and the second polarizer may each include a plurality of film layers, wherein the plurality of film layers of the first polarizer are stacked in an order opposite to that of the plurality of film layers of the second polarizer. For example, as shown in fig. 13A to 13C, in the thickness direction of the display panel (i.e., the third direction DR 3), the first polarizer 13 may include: the first protective layer 111, the first supporting layer 112, the first polarizing layer 113, the second supporting layer 114, and the first adhesive layer 115 are sequentially stacked along a third direction DR3 (i.e., a light emitting direction of the display panel), and the second polarizer 13 may include: a second adhesive layer 135, a third supporting layer 134, a second polarizing layer 133, a fourth supporting layer 132, and a second protective layer 131 sequentially stacked along the third direction DR3 (i.e., the light emitting direction of the display panel). Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, taking the third polarizer as an example including a plurality of film layers, as shown in fig. 13C, the third polarizer 15 may include: a third adhesive layer 151, a fifth supporting layer 152, a third polarizing layer 153 and a sixth supporting layer 154 sequentially stacked along the third direction DR3 (i.e., the light emitting direction of the display panel). Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, it is the polarizing layer that polarizes in the polarizer. For example, what is polarized in the first polarizer 11 is the first polarizing layer 113. For example, it is the second polarizing layer 133 that functions as the polarizing in the second polarizer 13. For example, the third polarizing layer 153 functions as a polarizing in the third polarizer 15.
In an exemplary embodiment, any one or more of the first, second, and third polarizing layers 113, 133, and 153 may include, but are not limited to, being formed using a polyvinyl alcohol (PVA) material. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, any one or more of the first, second, and third polarizing layers 113, 133, and 153 may have a thickness of between about 20 μm and about 32 μm. For example, the thickness of the first and second polarizing layers 113 and 133 may be about 28 μm. For example, the thickness of the third polarizing layer 153 may be about 22 μm. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the optical axis direction of the first polarizing layer 113 may be 90 degrees. Thus, the optical axis direction of the first polarizer can be 90 degrees. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the optical axis direction of the second polarizing layer 133 may be 90 degrees. Thus, the optical axis direction of the second polarizer can be 90 degrees. The embodiments of the present disclosure do not limit this.
In one exemplary embodiment, the optical axis direction of the third polarizing layer 153 may be 0 degree. Thus, the optical axis direction of the third polarizer can be 0 degree. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, the polarizing layer is very easily hydrolyzed, and in order to ensure the characteristics of the polarizing layer, a support layer having high light transmittance, good water resistance and certain mechanical strength may be respectively disposed on both sides of the polarizing layer for protection. For example, the first polarizing layer 113 may be protected by the first and second supporting layers 112 and 114 in the first polarizer 11. For example, the second polarizing layer 133 may be protected by the third and fourth supporting layers 134 and 132 in the second polarizing plate 13. For example, the third polarizing layer 153 may be protected by the fifth and sixth supporting layers 152 and 154 in the third polarizing plate 15.
In an exemplary embodiment, any one or more of the first support layer 112, the second support layer 114, the third support layer 134, and the fourth support layer 132 can include, but are not limited to, being formed using a Triacetylcellulose (TAC) material. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, any one or more of the first support layer 112, the second support layer 114, the third support layer 134, the fourth support layer 132, the fifth support layer 152, and the sixth support layer 154 may have a thickness of between about 30 μm and about 70 μm. For example, the thickness of the first support layer 112 may be about 40 μm. For example, the thickness of the second support layer 114 may be about 40 μm. For example, the thickness of the third support layer 134 may be about 40 μm. For example, the thickness of the fourth support layer 132 may be about 40 μm. For example, the thickness of the fifth support layer 152 may be about 40 μm. For example, the thickness of the sixth support layer 154 may be about 60 μm. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the adhesive layer is configured to adhere the polarizer to other functional film layers. For example, the first adhesive layer 115 may be configured to attach the first polarizer 11 and the first optical compensation film 16 together. For example, second adhesive layer 135 may be configured to attach second polarizer 13 and second optical compensation film 17 together. For example, the third adhesive layer 151 may be configured to attach the third polarizer 15 to the first liquid crystal panel 12. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, any one or more of the first Adhesive layer 115, the second Adhesive layer 135, the third Adhesive layer 151, the fourth Adhesive layer 30, and the fifth Adhesive layer 40 may include, but are not limited to, being formed using a Pressure Sensitive Adhesive (PSA) material. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, any one or more of the first adhesive layer 115, the second adhesive layer 135, the third adhesive layer 151, the fourth adhesive layer 30, and the fifth adhesive layer 40 may have a thickness of between about 8 μm and about 25 μm. For example, the thickness of the first adhesive layer 115 may be about 10 μm. For example, the thickness of the second adhesive layer 135 may be about 10 μm. For example, the thickness of the third adhesive layer 151 may be about 20 μm. For example, the thickness of the fourth adhesive layer 30 may be about 20 μm. For example, the thickness of the fifth adhesive layer 40 may be about 20 μm. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, any one or more of the first protective layer 111 and the second protective layer 131 may be a material with HC (Hard Coding) surface treatment, have a HC layer with high hardness and high water and oil repellency, can prevent the polarizer from being scratched, and is easier to clean. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the thickness of any one or more of the first protective layer 111 and the second protective layer 131 may be about 1 μm to 10 μm. For example, the thickness of the first protective layer 111 may be about 5 μm. For example, the thickness of the second protective layer 131 may be about 5 μm. The embodiments of the present disclosure do not limit this.
In addition, the display panel in the embodiment of the present disclosure may include other necessary components and structures, for example, components such as a gate line, a data line, a pixel electrode, a common electrode, and the like, in addition to the above structure. Those skilled in the art can design and supplement the display panel accordingly according to the type of the display panel, and the detailed description is omitted here.
An embodiment of the present disclosure also provides a display device, as shown in fig. 14, the display device may include: the display panel in one or more embodiments described above, and a third polarizer 15 located between the first liquid crystal panel 12 and the second liquid crystal panel 14. Among them, the first liquid crystal panel 12 may include: a first array substrate 121 and a first opposite substrate 122 disposed opposite to each other, and a first liquid crystal layer 123 disposed between the first array substrate 121 and the first opposite substrate 122; the second liquid crystal panel 14 may include: a second array substrate 141 and a second opposite substrate 142 disposed opposite to each other, and a second liquid crystal layer 143 disposed between the second array substrate 141 and the second opposite substrate 142; wherein, the optical axis direction of the liquid crystal molecules in the first liquid crystal layer 123 is 0 degree; the optical axis direction of the liquid crystal molecules in the second liquid crystal layer 143 is 0 degrees; the optical axis direction of the first polarizer 11 is 90 degrees; the optical axis direction of the second polarizer 13 is 90 degrees; the optical axis direction of the third polarizer 15 is 0 degree. In fig. 14, the optical modulation structure includes: the optical compensation film, the first optical compensation film 16 is disposed on a side of the first polarizer 11 away from the first liquid crystal panel 12, and the second optical compensation film 17 is disposed on a side of the second polarizer 13 away from the second liquid crystal panel 14. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the display device may further include: and a backlight module disposed on the non-display side of the display panel and configured to provide an initial backlight to the first liquid crystal panel 12. The first liquid crystal panel 12 may be referred to as a dimming panel or a light control panel. The first liquid crystal panel 12 is configured to adjust an initial backlight provided by the backlight module 30 and provide the adjusted backlight to the second liquid crystal panel 14. The second liquid crystal panel 14 is a display panel. And the second liquid crystal panel 14 is configured to receive the adjusted backlight and display different gray-scale colors. In this way, the brightness of the backlight provided to the second liquid crystal panel can be controlled by regions through the deflection angle of the liquid crystal molecules in the liquid crystal layer of the first liquid crystal panel.
In one exemplary embodiment, the first liquid crystal panel and the second liquid crystal panel may have the same external size and functional size. For example, the first liquid crystal panel and the second liquid crystal panel have the same shape and size, and the display area in the first liquid crystal panel and the light control area in the second liquid crystal panel have the same shape and size, so that after the first liquid crystal panel and the second liquid crystal panel are attached in an aligned manner, the light control area can correspond to the display area, and backlight emitted by the backlight module is provided to the display area after being regulated by the light control area. For example, the display region in the second liquid crystal panel includes: a plurality of display pixels; the light control region in the first liquid crystal panel includes: a plurality of light-controlling pixels.
In an exemplary embodiment, the first liquid crystal panel may be a black and white liquid crystal panel without a color film layer. The second liquid crystal panel can be a liquid crystal panel provided with a color film layer.
In an exemplary embodiment, as shown in fig. 14, the second array substrate 141 or the second opposite substrate 142 in the second liquid crystal panel 14 may include: a black matrix (not shown) and a color film layer 144 disposed on the same layer. For example, in fig. 14, an example in which a color film layer 144 is provided on a side of the second opposite substrate 142 close to the second liquid crystal layer 143 is illustrated.
In one exemplary embodiment, the color film layer may include: the color filter comprises a first color film unit, a second color film unit and a third color film unit which are arranged periodically, wherein the first color film unit is configured to filter light rays passing through the first color film unit and filter out first color light rays; the second color film unit is configured to filter the light rays passing through the second color film unit and filter out second color light rays; the third color film unit is configured to filter light passing through the third color film unit to filter out third color light. For example, the color film layer may include: the color filter comprises a red (R) color film unit, a green (G) color film unit and a blue (B) color film unit which are arranged periodically, or the red (R) color film unit, the green (G) color film unit, the blue (B) color film unit and the white (W) color film unit which are arranged periodically. Here, the embodiment of the present disclosure does not limit this.
In one exemplary embodiment, the first and second liquid crystal panels may be a horizontal electric field type display panel, for example, the horizontal electric field type display panel may be an ADS display mode or an IPS display mode. Here, the embodiment of the present disclosure does not limit this.
In an exemplary embodiment, the display device may include, but is not limited to, any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, or a navigator. Here, the embodiment of the present disclosure does not limit the type of the display device. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.
The above description of the embodiment of the display device, similar to the above description of the embodiment of the display panel, has similar advantageous effects to the embodiment of the display panel. For technical details not disclosed in the embodiments of the display device of the present disclosure, please refer to the description of the embodiments of the display panel of the present disclosure for understanding. And will not be described in detail herein.
Although the embodiments disclosed in the present disclosure are described above, the embodiments are only used for understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, and that the scope of the present disclosure is to be limited only by the terms of the appended claims.

Claims (23)

1. A display panel, comprising: the liquid crystal display panel comprises a first polaroid, a first liquid crystal panel, a second liquid crystal panel and a second polaroid which are sequentially stacked; wherein, the first and the second end of the pipe are connected with each other,
at least one of the first polarizer and the second polarizer is provided with an optical modulation structure, and the optical modulation structure comprises: any one of an optical compensation film configured to change a polarization state of light obliquely incident to the optical compensation film and a microstructure configured to change a propagation direction of light incident to the microstructure.
2. The display panel according to claim 1, wherein the first polarizer is provided with a first microstructure comprising: and a plurality of first convex parts arranged at intervals, wherein the cross-sectional shape of the first convex parts is a rectangle in a plane perpendicular to the display panel.
3. The display panel according to claim 2, wherein a refractive index of a material of the first convex portion is between 1.4 and 1.6.
4. The display panel according to claim 2, wherein the plurality of first protrusions are arranged periodically in a first direction and a second direction, at least one of a pitch of adjacent first protrusions in the first direction and a pitch of adjacent first protrusions in the second direction is between 4 micrometers and 6 micrometers, and the second direction intersects with the first direction.
5. The display panel according to claim 2, wherein a thickness of the first convex portion is between 5 and 20 micrometers in a thickness direction of the display panel.
6. The display panel according to any one of claims 1 to 5, wherein the second polarizer is provided with a second microstructure comprising: and a plurality of second convex parts arranged at intervals, wherein the cross-sectional shape of the second convex parts is a triangle, a part of a circle or a part of an ellipse on a plane perpendicular to the display panel.
7. The display panel according to claim 6, wherein a refractive index of a material of the second convex portion is between 1.4 and 1.6.
8. The display panel according to claim 6, wherein the plurality of second protrusions are arranged periodically in a first direction and a second direction, at least one of a pitch of adjacent second protrusions in the first direction and a pitch of adjacent second protrusions in the second direction is between 4 micrometers and 6 micrometers, and the second direction intersects with the first direction.
9. The display panel according to claim 6, wherein a thickness of the second convex portion is between 5 and 20 micrometers in a thickness direction of the display panel.
10. The display panel of claim 1, wherein the material of the microstructures comprises: any one or more of a cyclic olefin polymer COP material, a polymethyl methacrylate PMMA material and a cellulose triacetate TAC material.
11. The display panel according to claim 1, wherein the first polarizer and the second polarizer each include a plurality of film layers, and wherein the plurality of film layers of the first polarizer are stacked in an order opposite to that of the plurality of film layers of the second polarizer.
12. The display panel according to claim 11, wherein the first polarizing plate includes, in a thickness direction of the display panel: first protective layer, first supporting layer, first polarisation layer, second supporting layer and the first adhesive linkage of establishing superpose in proper order, the second polaroid includes: the second adhesive layer, the third supporting layer, the second polarizing layer, the fourth supporting layer and the second protective layer are sequentially stacked.
13. The display panel according to claim 1, further comprising: and the third polaroid is positioned between the first liquid crystal panel and the second liquid crystal panel, and the third polaroid is provided with the optical compensation film.
14. The display panel according to claim 1 or 13, wherein the optical compensation film comprises: and the compensation film layer is a + B type compensation film.
15. The display panel according to claim 14, wherein the thickness of the + B type compensation film is between 100 and 150 μm in the thickness direction of the display panel.
16. The display panel according to claim 15,
the + B type compensation film has a refractive index satisfying the following inequality: nx > ny > nz, 0.001< -nx-ny <0.004, and 0< -ny-nz <0.05;
wherein nx, nz and ny have values of 1.3 to 1.6, nx is a refractive index of the compensation film in the X-axis direction, ny is a refractive index of the compensation film in the Y-axis direction, nz is a refractive index of the compensation film in the Z-axis direction, the Y-axis is perpendicular to the X-axis, and the Z-axis is perpendicular to the Y-axis and the X-axis.
17. The display panel according to claim 1 or 13, wherein the optical compensation film comprises: two layers of compensation films, the two layers of compensation films comprising: and the + B type compensation film and the-B type compensation film are stacked, wherein in the two layers of compensation films, the + B type compensation film is positioned on one layer of the first polaroid close to the first liquid crystal panel or one layer of the second polaroid close to the second liquid crystal panel.
18. The display panel according to claim 17, wherein the thickness of the + B type compensation film is between 1 and 10 micrometers, and the thickness of the-B type compensation film is between 15 and 25 micrometers in the thickness direction of the display panel.
19. The display panel according to claim 18,
the + B type compensation film has a refractive index satisfying the following inequality: nx > ny > nz, 0.001< -nx-ny <0.004, and 0< -ny-nz <0.05;
the-B type compensation film has a refractive index satisfying the following inequality: ny < nx < nz, 0.002 are woven into nx-ny <0.004 and nz-ny >0;
wherein nx, nz and ny have values of 1.3 to 1.6, nx is a refractive index of the compensation film in the X-axis direction, ny is a refractive index of the compensation film in the Y-axis direction, nz is a refractive index of the compensation film in the Z-axis direction, the Y-axis is perpendicular to the X-axis, and the Z-axis is perpendicular to the Y-axis and the X-axis.
20. The display panel according to claim 1 or 13, wherein the optical compensation film comprises: a compensation film produced by stretching a polymer film or a copolymer film.
21. The display panel according to claim 20, wherein the polymer film comprises: any one of a cycloolefin polymer COP film, a polymethyl methacrylate PMMA film, and a triacetylcellulose TAC film.
22. The display panel according to claim 20, wherein the copolymer film comprises: cycloolefin copolymer COC film.
23. A display device, comprising: the display panel according to any one of claims 1 to 22, and a third polarizing plate between the first liquid crystal panel and the second liquid crystal panel, the first liquid crystal panel comprising: the liquid crystal display panel comprises a first array substrate, a first opposite substrate and a first liquid crystal layer, wherein the first array substrate and the first opposite substrate are oppositely arranged, and the first liquid crystal layer is arranged between the first array substrate and the first opposite substrate; the second liquid crystal panel includes: the liquid crystal display panel comprises a second array substrate, a second opposite substrate and a second liquid crystal layer, wherein the second array substrate and the second opposite substrate are oppositely arranged, and the second liquid crystal layer is arranged between the second array substrate and the second opposite substrate; wherein the content of the first and second substances,
the optical axis direction of liquid crystal molecules in the first liquid crystal layer is 0 degree;
the optical axis direction of liquid crystal molecules in the second liquid crystal layer is 0 degree;
the optical axis direction of the first polaroid is 90 degrees;
the optical axis direction of the second polaroid is 90 degrees;
the optical axis direction of the third polarizer is 0 degree.
CN202110930429.0A 2021-08-13 2021-08-13 Display panel and display device Pending CN115933241A (en)

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