CN113990916A - Display module and display device - Google Patents
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- CN113990916A CN113990916A CN202111302576.XA CN202111302576A CN113990916A CN 113990916 A CN113990916 A CN 113990916A CN 202111302576 A CN202111302576 A CN 202111302576A CN 113990916 A CN113990916 A CN 113990916A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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Abstract
The utility model discloses a display module assembly and display device relates to and shows technical field for improve the problem of the hair powder of avoiding display module assembly to appear under the large visual angle even. This display module assembly includes: the display panel comprises a display panel, a circular polarization layer and an optical compensation layer. The circular polarization layer is positioned on the light emergent side of the display panel; the circular polarization layer comprises a linear polarization layer and at least one phase retardation film; at least one phase delay film is positioned on one side of the linear polarization layer close to the display panel. The optical compensation layer is positioned on one side of the linear polarization layer close to the display panel; the optical compensation layer and the phase delay film are arranged in a laminated mode; the optical axis of the optical compensation layer is perpendicular to the plane of the optical compensation layer. The display module that this disclosure provided can be applied to display device, has the problem of improving or even avoiding the powder of sending out that display device appears under the large visual angle to improve display device display effect under full visual angle.
Description
Technical Field
The disclosure relates to the technical field of display, in particular to a display module and a display device.
Background
An Organic Light-Emitting Diode (OLED) display device is becoming one of the mainstream display fields due to its excellent properties such as low power consumption, high color saturation, wide viewing angle, thin thickness, and flexibility.
Disclosure of Invention
An object of the present disclosure is to provide a display module and a display device for improve and even avoid the problem of sending out powder that display module appears under the large visual angle, thereby improve the display effect of display module under full visual angle.
In order to achieve the above object, the present disclosure provides the following technical solutions:
in one aspect, a display module is provided. The display module assembly includes: the display panel comprises a display panel, a circular polarization layer and an optical compensation layer. The circular polarization layer is positioned on the light emitting side of the display panel; the circular polarization layer comprises a linear polarization layer and at least one phase retardation film; the at least one layer of phase delay film is positioned on one side of the linear polarization layer close to the display panel. The optical compensation layer is positioned on one side of the linear polarization layer close to the display panel; the optical compensation layer is arranged in a lamination mode with the phase delay film; the optical axis of the optical compensation layer is perpendicular to the plane of the optical compensation layer.
In some embodiments, the refractive index of the optical compensation layer in a first axis is equal to the refractive index of the optical compensation layer in a second axis; wherein the first axis and the second axis are both located within the optical compensation layer plane, and the first axis is perpendicular to the second axis.
In some embodiments, the optical compensation layer is a + C compensation film layer.
In some embodiments, the optical compensation layer has a refractive index of 1.0-2.0 for ordinary rays; the refractive index of the optical compensation layer to the extraordinary ray is 1.0-2.0; the difference value between the refractive index of the optical compensation layer to the extraordinary ray and the refractive index of the optical compensation layer to the ordinary ray is 0-0.3.
In some embodiments, the optical compensation layer has a thickness of 1 μm to 3 μm.
In some embodiments, the optical compensation layer comprises: a reactive liquid crystal layer and a first alignment film. The optical axis of the liquid crystal molecules in the reactive liquid crystal layer is perpendicular to the plane of the reactive liquid crystal layer. The first alignment film is positioned on one side of the reactive liquid crystal layer close to the display panel and is configured to align liquid crystal molecules in the reactive liquid crystal layer.
In some embodiments, the at least one phase retardation film comprises: a first phase retardation film and a second phase retardation film. The first phase delay film layer comprises a quarter-wave plate layer and a second alignment film which are arranged in a laminated mode; the optical axis of the liquid crystal molecules in the quarter-wave plate layer is parallel to the plane where the quarter-wave plate layer is located; the second alignment film is configured to align liquid crystal molecules in the quarter-wave plate layer. The second layer of phase delay film is positioned on one side of the first layer of phase delay film, which is far away from the display panel; the second phase delay film layer comprises a half wave plate layer and a third alignment film which are arranged in a laminated mode; the optical axis of the liquid crystal molecules in the half wave plate layer is parallel to the plane where the half wave plate layer is located; the third alignment film is configured to align liquid crystal molecules in the half-wave plate layer.
In some embodiments, the angle between the optical axis of the liquid crystal molecules in the quarter-wave plate layer and the absorption axis of the linear polarizing layer is 75 ° ± 5 °; and an included angle between the optical axis of the liquid crystal molecules in the half wave plate layer and the absorption axis of the linear polarization layer is 15 +/-5 degrees.
In some embodiments, the difference between the refractive index of the quarter-wave plate layer for ordinary rays and the refractive index of the optical compensation layer for ordinary rays is 0-0.1; and/or the difference value between the refractive index of the half wave plate layer to the ordinary ray and the refractive index of the optical compensation layer to the ordinary ray is 0-0.1.
In some embodiments, the refractive index of the quarter-wave plate layer for ordinary rays is equal to the refractive index of the optical compensation layer for ordinary rays; and/or the refractive index of the half wave plate layer to the ordinary ray is equal to that of the optical compensation layer to the ordinary ray.
In some embodiments, the difference between the refractive index of the quarter-wave plate layer for extraordinary rays and the refractive index of the optical compensation layer for extraordinary rays is 0-0.1; and/or the difference value between the refractive index of the half wave plate layer to the extraordinary ray and the refractive index of the optical compensation layer to the extraordinary ray is 0-0.1.
In some embodiments, the refractive index of the quarter-wave plate layer for extraordinary rays is equal to the refractive index of the optical compensation layer for extraordinary rays; and/or the refractive index of the half wave plate layer to the extraordinary ray is equal to that of the optical compensation layer to the extraordinary ray.
In some embodiments, the quarter-wave plate layer has a thickness of 1 μm to 3 μm; and/or the thickness of the half wave plate layer is 1-3 mu m.
In some embodiments, the optical compensation layer is configured to be disposed in any one of: the optical compensation layer is positioned between the first layer of phase retardation film and the second layer of phase retardation film; or, the optical compensation layer is positioned between the at least one phase retardation film and the linear polarization layer; or, the optical compensation layer is positioned between the at least one phase retardation film and the display panel.
In another aspect, a display device is provided. The display device includes: the display module according to any of the above embodiments.
The display module assembly and the display device have the following beneficial effects:
according to the display module, the optical compensation layer is arranged, and the optical axis of the optical compensation layer is controlled to be perpendicular to the plane where the optical compensation layer is located, so that the optical axis of the optical compensation layer is perpendicular to the optical axis of the phase retardation film. Under the condition, along with the gradual increase of the visual angle, the phase retardation of the optical compensation layer to the light of the set waveband is increased, so that the problem that the phase retardation of the circular polarization layer to the light of the set waveband is reduced under a large visual angle can be compensated, the problem of the powder emission of the display module under the large visual angle is improved or even avoided, and the display effect of the display module under the full visual angle is finally improved.
The beneficial effects that this disclosure can realize the display device are the same with the beneficial effects that display module assembly can reach that above-mentioned technical scheme provided, do not do this and give unnecessary details.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art according to the drawings. Furthermore, the drawings in the following description may be regarded as schematic diagrams, and do not limit the actual size of products, the actual flow of methods, the actual timing of signals, and the like, involved in the embodiments of the present disclosure.
Fig. 1 is a block diagram of a display device according to some embodiments of the present disclosure;
fig. 2 is a top view of a display module according to some embodiments of the present disclosure;
fig. 3 is a top view of another display module according to some embodiments of the present disclosure;
FIG. 4 is a cross-sectional view taken along line A-A' of FIG. 2;
FIG. 5 is another cross-sectional structural view taken at A-A' in FIG. 2;
FIG. 6 is a view showing a further cross-sectional structure at A-A' in FIG. 2;
FIG. 7 is a view of still another cross-sectional structure taken along line A-A' of FIG. 2;
FIG. 8 is a schematic diagram of a phase retardation film according to some embodiments of the present disclosure;
fig. 9 is a schematic diagram of another phase retardation film according to some embodiments of the present disclosure;
fig. 10 is a cross-sectional structural view of a display module according to some embodiments of the present disclosure;
FIG. 11 is a schematic diagram of the operation of an optical compensation layer according to some embodiments of the present disclosure;
FIG. 12 is a schematic diagram of another optical compensation layer provided in some embodiments of the present disclosure;
fig. 13 is a cross-sectional structural view of another display module according to some embodiments of the present disclosure;
fig. 14 is a cross-sectional structural view of another display module according to some embodiments of the present disclosure;
FIG. 15 is a schematic diagram of the operation of a circular polarizing layer according to some embodiments of the present disclosure;
fig. 16 is a cross-sectional structural view of another display module according to some embodiments of the present disclosure;
fig. 17 is a cross-sectional structural view of another display module according to some embodiments of the present disclosure;
fig. 18 is a cross-sectional structural view of another display module according to some embodiments of the present disclosure;
fig. 19 is a cross-sectional structural view of another display module according to some embodiments of the present disclosure;
fig. 20 is a layout diagram of an optical axis direction of a quarter-wave plate layer, an optical axis direction of a half-wave plate layer, and an absorption axis direction of a linear polarization layer in a display module according to some embodiments of the disclosure.
Detailed Description
Technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided by the present disclosure belong to the protection scope of the present disclosure.
Unless the context requires otherwise, throughout the description and the claims, the term "comprise" and its other forms, such as the third person's singular form "comprising" and the present participle form "comprising" are to be interpreted in an open, inclusive sense, i.e. as "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present disclosure, "a plurality" means two or more unless otherwise specified.
In describing some embodiments, the expression "connected" and its derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the contents herein.
"A and/or B" includes the following three combinations: a alone, B alone, and a combination of A and B.
The use of "configured to" herein means open and inclusive language that does not exclude devices that are suitable or configured to perform additional tasks or steps.
Additionally, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or values beyond those stated.
As used herein, "parallel," "perpendicular," and "equal" include the stated case and cases that approximate the stated case to within an acceptable range of deviation as determined by one of ordinary skill in the art in view of the measurement in question and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where an acceptable deviation from approximately parallel may be, for example, within 5 °; "perpendicular" includes absolute perpendicular and approximately perpendicular, where an acceptable deviation from approximately perpendicular may also be within 5 °, for example. "equal" includes absolute and approximate equality, where the difference between the two, which may be equal within an acceptable deviation of approximately equal, is less than or equal to 5% of either.
It will be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present.
Example embodiments are described herein with reference to cross-sectional and/or plan views as idealized example figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.
Some embodiments of the present disclosure provide a display device 1000. Referring to fig. 1, the display device 1000 includes a display module 100.
In some examples, referring to fig. 2 and 3, the display module 100 has a display area a located inside a dashed line frame and a peripheral area B located outside the dashed line frame. The display module 100 can display an image at a position in the display area a.
It should be noted that the present disclosure does not limit the arrangement position of the peripheral area B. For example, the peripheral region B may be located on one side, two sides, three sides, or the like of the display region a. For another example, referring to fig. 2 and fig. 3, the peripheral region B may also surround the display region a by one turn.
The Display device 1000 may be of various types, such as an Organic Light-Emitting Diode (OLED) Display device, a Quantum Dot Light Emitting Diode (QLED) Display device, a Light Emitting Diode (LED) Display device, a Liquid Crystal Display (LCD) device, and so on.
The product forms of the display device 1000 described above also include a variety, and may be, for example, any device that displays both moving (e.g., video) and stationary (e.g., still image), as well as text and images. More specifically, the display device 1000 may be disposed in or associated with a variety of electronic devices, the various electronic devices described above may be, for example, but are not limited to, a mobile telephone, a wireless device, a Personal Data Assistant (PDA), a handheld or portable computer, a GPS receiver/navigator, a camera, an MP4 video player, a camcorder, a game console, a watch, a clock, a calculator, a television monitor, a flat panel display, a computer monitor, an automotive display (which may be, for example, an odometer display), a navigator, a cockpit control and/or display, a display of camera views (which may be, for example, a display of a rear-view camera in a vehicle), an electronic photograph, an electronic billboard or sign, a projector, an architectural structure, packaging, and aesthetic structure (which may be, for example, a display of an image of a piece of jewelry), and so forth.
Hereinafter, the structure of the display module 100 provided in some embodiments of the present disclosure is schematically described with reference to the drawings.
In some embodiments, referring to fig. 4 and 5, the display module 100 includes: a display panel 1.
In some examples, with continuing reference to fig. 4 and 5, the display panel 1 includes: a substrate 11.
It is to be noted that the types of the substrate 11 described above include various types, including, for example, but not limited to, the following examples.
Illustratively, the substrate 11 may be a rigid substrate. The rigid substrate may be a glass substrate or a PMMA (Polymethyl methacrylate) substrate.
As another example, the substrate 11 may be a flexible substrate. The flexible substrate may be a PET (Polyethylene terephthalate) substrate, a PEN (Polyethylene naphthalate) substrate, a PI (Polyimide) substrate, or the like.
In some examples, referring to fig. 2 to 5, the display panel 1 may further include: a plurality of sub-pixels P disposed at one side of the substrate 11.
The arrangement of the plurality of sub-pixels P includes various ways. For example, referring to fig. 2 and 3, a plurality of sub-pixels P may be disposed in the display area a.
Illustratively, the plurality of subpixels P includes at least one first color subpixel, at least one second color subpixel, and at least one third color subpixel, wherein the first color, the second color, and the third color constitute three primary colors.
For example, referring to fig. 3, the plurality of sub-pixels P includes at least one red sub-pixel R, at least one green sub-pixel G, and at least one blue sub-pixel B.
Illustratively, referring to fig. 4 and 5, each sub-pixel P includes a pixel driving circuit 12 and a light emitting device 13 electrically connected to the pixel driving circuit 12. The pixel driving circuit 12 is configured to supply a driving voltage to the light emitting device 13 electrically connected thereto to control a light emitting state of the light emitting device 13.
It is to be readily understood that the structure of the pixel driving circuit 12 described above includes various kinds, including, for example, but not limited to, the following examples.
For example, the structure of the pixel driving circuit 12 may include a structure of "2T 1C", "6T 1C", "7T 1C", "6T 2C", or "7T 2C", or the like. Here, "T" is expressed as a thin film transistor, and the number located in front of "T" is expressed as the number of thin film transistors; "C" is denoted as a storage capacitor C, and the number located before "C" is denoted as the number of storage capacitors C.
It is easily understood that the structure of the above-described light emitting device 13 includes various kinds, for example, including but not limited to the following examples.
For example, with continued reference to fig. 4 and 5, the light emitting device 13 includes an anode 131 disposed on a side of the pixel driving circuit 12 away from the substrate 11 and electrically connected to the pixel driving circuit 12, and a light emitting layer 132 and a cathode 133 stacked on a side of the anode 131 away from the substrate 11.
In some embodiments, the light emitting device 13 may further include a hole injection layer and/or a hole transport layer disposed between the anode 131 and the light emitting layer 132.
In some embodiments, the light emitting device 13 may further include an electron transport layer and/or an electron injection layer disposed between the light emitting layer 132 and the cathode 133.
The structure of the light-emitting layer 132 includes a plurality of structures. For example, the light emitting layer 132 may be an organic light emitting layer, and in this case, the light emitting device 13 may be referred to as an OLED light emitting device; for another example, the light emitting layer 132 may be an inorganic light emitting layer, and in this case, the light emitting device 13 may be referred to as a QLED light emitting device.
In some embodiments, the light emitting device 13 may be a top emission type light emitting device or a bottom emission type light emitting device. Taking the light emitting device 13 as a top emission type light emitting device as an example, the material of the anode 1031 may be a metal material with low light transmittance and high reflectance.
In some examples, referring to fig. 4 and 5, the display panel 1 may further include: and an encapsulation layer 14 disposed on a side of the plurality of sub-pixels P remote from the substrate 11. Wherein the orthographic projection of each sub-pixel P on the substrate 11 is within the orthographic projection range of the encapsulation layer 14 on the substrate 11. By such a design, the encapsulation layer 14 can be used to form a good encapsulation effect on the plurality of sub-pixels P, and prevent the light emitting devices 13 in the plurality of sub-pixels P from being corroded by external water vapor and/or oxygen, thereby affecting the light emitting efficiency and the service life of the light emitting devices 13.
In some examples, referring to fig. 4 and 5, the display panel 1 may further include: a pixel defining layer 15. The pixel defining layer 15 has a plurality of pixel openings 151 for receiving the plurality of light emitting devices 13; wherein each pixel opening 151 is configured to define an effective light emitting area of the sub-pixel P corresponding to the pixel opening 151.
In some embodiments, referring to fig. 4 and 5, the display module 100 further includes: the linear polarization layer 2, the first optical glue layer 3 and the protective cover plate 4 are positioned on the light-emitting side of the display panel 1 and are arranged in a laminating mode along the direction Z far away from the display panel 1. Wherein the first optical glue layer 3 is configured to adhere the protective cover plate 4 to the linear polarizing layer 2.
In some examples, referring to fig. 5, the linear polarizing layer 2 includes: a polymerizable liquid crystal layer 21, and a fourth alignment film 22. The fourth alignment film 22 is located on a side of the polymerizable liquid crystal layer 21 close to the display panel 1, and the fourth alignment film 22 is configured to align liquid crystal molecules in the polymerizable liquid crystal layer 21.
Illustratively, the polymerizable liquid crystal layer 21 includes a polymerizable liquid crystal mixed with a dichroic dye.
Illustratively, the material of the fourth alignment film 22 is selected from substances having alignment ability. For example, the material of the fourth alignment film 22 is polyimide.
In some examples, the material of the first optical adhesive layer 3 may be polyurethane adhesive, acrylic adhesive, or silicone adhesive, for example.
In some examples, the material of the protective cover 4 may be glass, for example.
It should be noted that the materials of the first optical adhesive layer 3 and the protective cover plate 4 may also be other materials, which is not limited in this disclosure.
In some examples, referring to fig. 4 and 5, the display module 100 further includes: and a touch structure 5. In this case, the display device 1000 is a touch display device.
It should be noted that the arrangement manner of the touch structure 5 includes various manners, for example, including but not limited to the following examples.
For example, referring to fig. 4, the touch structure 5 is located between the display panel 1 and the linear polarization layer 2. At this time, the touch structure 5 is directly formed on the display panel 1.
Referring to fig. 5, the display module 100 further includes: an external substrate 6 and a second optical adhesive layer 7. The external substrate 6 is positioned between the display panel 1 and the linear polarization layer 2; the second optical adhesive layer 7 is positioned between the external substrate 6 and the display panel 1, and the second optical adhesive layer 7 is configured to bond the external substrate 6 to the display panel 1; the touch structure 5 is disposed on a surface of the external substrate 6 away from the second optical adhesive layer 7. At this time, the touch structure 5 is attached to the display panel 1 by means of external attachment.
It should be noted that, there are various light reflecting structures (for example, the pixel driving circuit 12 and the anode 131, etc.) in the display panel 1, and therefore, after the external environment light enters the display panel 1 from the light emitting side of the display panel 1, the various light reflecting structures easily reflect the external environment light, so as to have a bad effect on the display effect of the display module 100, for example, the contrast of the display module 100 may be reduced.
Based on this, in some embodiments, referring to fig. 6 and fig. 7, the display module 100 further includes: at least one phase retardation film 8 positioned between the display panel 1 and the linear polarizing layer 2.
Among them, at least one phase retardation film 8 may constitute the circular polarizing layer 10 together with the linear polarizing layer 2, for example. In this case, the optical axis of the phase retardation film 8 is parallel to the plane in which the phase retardation film 8 is located.
Please refer to fig. 7, in a case that the display module 100 includes the touch structure 5, at least one phase retardation film 8 is located between the touch structure 5 and the linear polarization layer 2.
In some embodiments, at least one phase retardation film 8 is disposed to form the circular polarization layer 10 with the linear polarization layer 2, so that the external environment light incident on the display module 100 can be converted into circular polarization light after passing through the circular polarization layer 10, and the circular polarization light is reflected by the reflective structure in the display panel 1 and then does not exit from the light exit side of the display module 100, thereby reducing the reflectivity of the display module 100 to the external environment light, and finally improving the display effect of the display module 100.
In this regard, the inventors of the present disclosure found through research that: referring to FIG. 8, in the case of a light ray (e.g., green light) of a set wavelength band being incident vertically, the phaseThe retardation film 8 retards the phase of the light beam in the set wavelength band by an amount Δ n1＝ny1－nx1(m +1/4) λ; wherein m is an integer; n isx1Is the first axis X of the phase retardation film 8 in its plane1Refractive index ofy1The second axis Y of the phase retardation film 8 in its plane1(ii) refractive index of (d); first axis X1And a second axis Y1And is vertical. Referring to fig. 9, in the case that the light (for example, green light) of the set wavelength band is obliquely incident, the retardation amount Δ n of the retardation film 8 with respect to the light of the set wavelength band1＇＝ne1－no1(ii) a Wherein n ise1Is a refractive index of the phase retardation film 8 to extraordinary rays, no1The refractive index of the phase retardation film 8 for ordinary rays.
On this basis, it can be seen that: n isx1＝no1And n isy1＞ne1Thus Δ n1＞Δn1". Therefore, in the case where light of the above-described set wavelength band (for example, green light) is obliquely incident, the amount of phase retardation of the phase retardation film 8 with respect to light of the set wavelength band is reduced, so that the emission amount of blue light is reduced, and the emission amount of red light is increased, thereby causing a problem that the display device 1000 generates powder at a large viewing angle.
Based on this, some embodiments of the present disclosure provide a display module 100. Referring to fig. 10, the display module 100 includes: a display panel 1, a circular polarizing layer 10 and an optical compensation layer 9. The circular polarizing layer 10 includes a linear polarizing layer 2 and at least one phase retardation film 8; wherein, at least one layer of phase retardation film 8 is positioned on one side of the linear polarization layer 2 close to the display panel 1. The optical compensation layer 9 is positioned on one side of the linear polarization layer 2 close to the display panel 1 and is arranged in a laminating way with the phase delay film 8; referring to fig. 11 and 12, the optical axis of the optical compensation layer 9 is perpendicular to the plane of the optical compensation layer 9.
In fig. 11, when light in a set wavelength band (for example, green light) is vertically incident, the phase retardation Δ n of the optical compensation layer 9 with respect to the light in the set wavelength band is equal to ny－nx(ii) a Wherein n isxFor the optical compensation layer 9 to be the first in its planeRefractive index on axis X, nyThe refractive index of the optical compensation layer 9 on the second axis Y in its plane; the first axis X and the second axis Y are perpendicular. Referring to fig. 12, when the light of the set wavelength band (e.g., green light) is obliquely incident, the phase retardation Δ n' of the optical compensation layer 9 with respect to the light of the set wavelength band is ne－no(ii) a Wherein n iseIs the refractive index, n, of the optical compensation layer 9 to extraordinary raysoThe refractive index of the optical compensation layer 9 for ordinary rays. Thus, it can be seen that: n isx＝noAnd n isy＜ne1Thus Δ n < Δ n'.
In summary, in the display module 100 provided in some embodiments of the present disclosure, the optical compensation layer 9 is disposed, and the optical axis of the optical compensation layer 9 is controlled to be perpendicular to the plane where the optical compensation layer is located, so that the optical axis of the optical compensation layer 9 is perpendicular to the optical axis of the phase retardation film 8. In this case, as the viewing angle gradually increases, the phase retardation of the optical compensation layer 9 for the light in the set wavelength band increases, so that the problem of the phase retardation film 8 for the light in the set wavelength band decreasing at a large viewing angle can be compensated, thereby improving or even avoiding the problem of the display device 1000 generating powder at the large viewing angle, and finally improving the display effect of the display device 1000 at the full viewing angle.
The optical compensation layer 9 may be, for example, a uniaxial optical compensation layer having only one optical axis.
In some examples, referring to fig. 11, the refractive index n of the optical compensation layer 9 in the first axis XxRefractive index n in the second axis Y with the optical compensation layer 9yAre equal.
In some of the examples described above, the refractive index n in the first axis X is determined by defining the refractive index of the optical compensation layer 9xWith its refractive index n in the second axis YyWhen the light beam in the set wavelength band is vertically incident on the display panel 1 under the normal viewing angle, the phase retardation Δ n of the optical compensation layer 9 with respect to the light beam in the set wavelength band is equal to ny－nx0, so that the optical compensation layer 9 can compensate the phase delay not only in a large viewing angleThe retardation film 8 reduces the retardation of the set wavelength band light, and the retardation of the retardation film 8 with respect to the set wavelength band light is not changed at the normal viewing angle, thereby further ensuring the display effect of the display device 1000 at the full viewing angle.
Illustratively, the optical compensation layer 9 is a + C compensation film layer.
The + C compensation film layer satisfies nz＞nx＝ny. Wherein n iszIs the refractive index of the + C compensation film layer in its thickness direction (e.g., the direction Z away from the display panel 1); n isxCompensating the refractive index of the film layer for the + C in a first axis X, nyThe refractive index of the film layer in the second axis Y is compensated for this + C.
In some of the above examples, by defining the optical compensation layer 9 as a + C compensation film layer, when the light in the set wavelength band is vertically incident to the display panel 1 under the normal viewing angle, the phase retardation of the optical compensation layer 9 for the light in the set wavelength band is 0, so that the optical compensation layer 9 can compensate the problem that the phase retardation of the phase retardation film 8 for the light in the set wavelength band is reduced under the large viewing angle, and the phase retardation of the phase retardation film 8 for the light in the set wavelength band is not changed under the normal viewing angle, thereby further ensuring the display effect of the display device 1000 under the full viewing angle.
In some embodiments, the refractive index n of the optical compensation layer 9 for ordinary rayso1.0 to 2.0, the refractive index n of the optical compensation layer to the extraordinary rayeIs 1.0 to 2.0. On the basis, the refractive index n of the optical compensation layer 9 to the extraordinary rayeRefractive index n of ordinary ray with optical compensation layer 9oThe difference Δ n' between them is 0 to 0.3.
It should be noted that in the description of some embodiments, the value range is 1.0-2.0, including two endpoints and all values in between, such as 1.0, 1.5 and 2.0. Similarly, the range of values is 0 to 0.3, including both endpoints and all values therebetween, such as 0, 0.1, 0.2, and 0.3.
In some of the above embodiments, the optical compensation layer 9 pairs are definedRefractive index n of extraordinary rayeRefractive index n of optical compensation layer 9 to ordinary rayoAnd the difference Δ n' between the two, which can control the variation range of the phase retardation of the optical compensation layer 9 to the light ray of the set wave band under each visual angle, thereby ensuring the compensation effect of the optical compensation layer 9 to the problem of the phase retardation film 8 to the light ray of the set wave band being reduced.
In some embodiments, referring to fig. 10, 13-14, and 16-19, the thickness L of the optical compensation layer 91Is 1-3 μm.
Wherein the thickness L of the optical compensation layer 91For example, the size of the optical compensation layer 9 in the direction Z perpendicular to the display panel 1.
It should be noted that in the description of some of the above embodiments, the range of values is 1 μm to 3 μm, and includes both endpoints and all values therebetween, such as 1 μm, 1.5 μm, 2 μm, 2.5 μm and 3 μm.
In some embodiments, the thickness of the optical compensation layer 9 is limited, so that the thickness of the display module 100 can be controlled, and the display module 100 has good bending performance.
In some embodiments, referring to fig. 13-14 and 16-19, the optical compensation layer 9 includes: a reactive liquid crystal layer 91 and a first alignment film 92. Wherein, the optical axis of the liquid crystal molecules in the reactive liquid crystal layer 91 is perpendicular to the plane of the reactive liquid crystal layer 91; the first alignment film 92 is configured to align liquid crystal molecules in the reactive liquid crystal layer 91.
The material of the first alignment film 92 is selected from materials having alignment ability. Illustratively, the material of the first alignment film 92 is polyimide.
In some of the above embodiments, by providing the reactive liquid crystal layer 91 and controlling the optical axes of the liquid crystal molecules in the reactive liquid crystal layer 91 to be perpendicular to the plane in which they are located, the optical axis of the optical compensation layer 9 can be made to be perpendicular to the optical axis of the phase retardation film 8. In this case, as the viewing angle gradually increases, the phase retardation of the optical compensation layer 9 for the light in the set wavelength band increases, so that the problem of the phase retardation film 8 for the light in the set wavelength band decreasing at a large viewing angle can be compensated, thereby improving or even avoiding the problem of the display device 1000 generating powder at the large viewing angle, and finally improving the display effect of the display device 1000 at the full viewing angle.
In some embodiments, referring to fig. 14, the total number of layers of the retardation film 8 is one, and the retardation film 8 includes: a second alignment film 812 'and a quarter-wave plate layer 811' which are sequentially stacked in a direction away from the display panel 1; wherein, the optical axis of the liquid crystal molecules in the quarter-wave plate layer 811 'is parallel to the plane where the quarter-wave plate layer 811' is located; the second alignment film 812 'is configured to align liquid crystal molecules in the quarter-wave plate layer 811'.
In some embodiments, referring to fig. 15, by providing the quarter-wave plate layer 811 ', the quarter-wave plate layer and the linear polarization layer 2 form the circular polarization layer 10, external environment light incident to the display module 100 can be converted into linearly polarized light after passing through the linear polarization layer 2, the linearly polarized light is converted into circularly polarized light after passing through the quarter-wave plate layer 811 ', the rotation direction of the circularly polarized light is reversed after being reflected by the reflective structure in the display panel 1, the light with the reversed rotation direction is converted into linearly polarized light with the polarization direction perpendicular to the linear polarization layer 2 after passing through the quarter-wave plate layer 811 ', and the linearly polarized light cannot be emitted from the light emitting side of the display module 100, so that the reflectivity of the display module 100 to the external environment light is reduced, and the display effect of the display module 100 is finally improved.
However, in general, the material of the quarter-wave plate layer 811' generates a positive dispersion effect in which the wavelength is inversely proportional to the phase difference, so that the red light and the blue light in the external environment light cannot be completely circularly polarized, and finally, a part of the red light and the blue light is emitted from the light-emitting side of the display module 100, resulting in a problem that the display device 1000 emits violet light.
In view of this, in some embodiments, referring to fig. 16 to 19, at least one of the retardation films 8 includes: a first phase retardation film 81 and a second phase retardation film 82.
The first-layer phase retardation film 81 includes a quarter-wave plate layer 811 and a second alignment film 812 which are disposed in a stacked manner; wherein, the optical axis of the liquid crystal molecules in the quarter-wave plate layer 811 is parallel to the plane where the quarter-wave plate layer 811 is located; the second alignment film 812 is configured to align the liquid crystal molecules in the quarter-wave plate layer 811.
The second phase retardation film 82 is located on the side of the first phase retardation film 82 away from the display panel 1. The second phase retardation film 82 includes a half-wave plate layer 821 and a third alignment film 822 which are stacked; wherein, the optical axis of the liquid crystal molecules in the half wave plate layer 821 is parallel to the plane where the half wave plate layer 821 is located; the third alignment film 822 is configured to align liquid crystal molecules in the half wave plate layer 821.
The material of the second alignment film 811 is selected from materials having alignment ability. Illustratively, the material of the second alignment film 811 is polyimide.
Similarly, the material of the third alignment film 821 is selected from materials having alignment ability. Illustratively, the material of the third alignment film 821 is polyimide.
In some embodiments, by providing the quarter-wave plate layer 811 and the half-wave plate layer 821 at the same time, an inverse dispersion effect in which the wavelength is proportional to the phase difference can be achieved, so that circular polarization is achieved for the external environment light of the full band, and the problem of purple emission of the display device 1000 is finally avoided, thereby improving the display effect of the display device 1000.
It is to be understood that, in the first phase retardation film 81, the quarter-wave plate layer 811 and the second alignment film 812 may be disposed in various ways, and the disclosure is not limited thereto.
For example, referring to fig. 16 to 19, the second alignment film 812 and the quarter-wave plate layer 811 are sequentially stacked in a direction Z away from the display panel 1.
Similarly, in the second retardation film 82, the half-wave plate layer 821 and the third alignment film 822 are disposed in various ways, which is not limited in the disclosure.
For example, referring to fig. 16 to 19, the third alignment film 822 and the half wave plate layer 821 are sequentially stacked in a direction Z away from the display panel 1.
In some embodiments, referring to FIG. 20, the optical axis m of the liquid crystal molecules in the quarter-wave plate layer 8111Angle o with absorption axis m of linear polarizing layer 2175 ° ± 5 °; optical axis m of liquid crystal molecules in half wave plate layer 8212Angle o with absorption axis m of linear polarizing layer 22Is 15 degrees +/-5 degrees.
It should be noted that in the description of some of the above embodiments, the range of values is 75 ° ± 5 °, for example, 70 °, 75 ° and 80 ° may be included. Similarly, the numerical range 15 ° ± 5 °, for example, may include 10 °, 15 °, and 20 °.
In some of the embodiments described above, the optical axis m of the liquid crystal molecules in the quarter-wave plate layer 811 is controlled1Angle o with absorption axis m of linear polarizing layer 21And the optical axis m of the liquid crystal molecules in the half wave plate layer 8212Angle o with absorption axis m of linear polarizing layer 22The circularly polarized external ambient light of the full band can be realized, and the problem of purple emission of the display device 1000 is finally avoided, so that the display effect of the display device 1000 is improved.
In some embodiments, the difference between the refractive index of the quarter-wave plate layer 811 for ordinary rays and the refractive index of the optical compensation layer 9 for ordinary rays is 0-0.1; and/or the difference between the refractive index of the half wave plate layer 821 for the ordinary ray and the refractive index of the optical compensation layer 9 for the ordinary ray is 0-0.1.
It should be noted that in the description of some embodiments, the value range is 0 to 0.1, including two endpoints and all values in between, such as 0, 0.05 and 0.1.
In some of the above embodiments, by controlling the difference between the refractive index of the quarter-wave plate layer 811 for ordinary rays and the refractive index of the optical compensation layer 9 for ordinary rays and/or the difference between the refractive index of the half-wave plate layer 821 for ordinary rays and the refractive index of the optical compensation layer 9 for ordinary rays, the compensation effect of the optical compensation layer 9 against the problem of the phase retardation film 8 reducing the phase retardation amount of the light rays in the above-mentioned set wavelength band can be ensured.
In some examples, the refractive index of the quarter-wave plate layer 811 for ordinary rays is equal to the refractive index of the optical compensation layer 9 for ordinary rays; and/or the refractive index of the half wave plate layer 821 for ordinary rays is equal to the refractive index of the optical compensation layer 9 for ordinary rays.
In some of the above embodiments, by controlling the refractive index of the quarter-wave plate layer 811 for ordinary rays to be equal to the refractive index of the optical compensation layer 9 for ordinary rays and/or the refractive index of the half-wave plate layer 821 for ordinary rays to be equal to the refractive index of the optical compensation layer 9 for ordinary rays, the compensation effect of the optical compensation layer 9 for the problem of the phase retardation film 8 reducing the phase retardation amount of the light in the above-mentioned set wavelength band can be further improved.
In some embodiments, the difference between the refractive index of the quarter-wave plate layer 811 for the extraordinary rays and the refractive index of the optical compensation layer 9 for the extraordinary rays is 0-0.1; and/or the difference between the refractive index of the half wave plate layer 821 for the extraordinary ray and the refractive index of the optical compensation layer 9 for the extraordinary ray is 0-0.1.
It should be noted that in the description of some embodiments, the value range is 0 to 0.1, including two endpoints and all values in between, such as 0, 0.05 and 0.1.
In some of the above embodiments, by controlling the difference between the refractive index of the quarter-wave plate layer 811 for the extraordinary rays and the refractive index of the optical compensation layer 9 for the extraordinary rays and/or the difference between the refractive index of the half-wave plate layer 821 for the extraordinary rays and the refractive index of the optical compensation layer 9 for the extraordinary rays, the compensation effect of the optical compensation layer 9 for the problem of the phase retardation film 8 that reduces the amount of phase retardation for the light rays in the above-mentioned set wavelength band can be ensured.
In some examples, the refractive index of the quarter-wave plate layer 811 for extraordinary rays is equal to the refractive index of the optical compensation layer 9 for extraordinary rays; and/or the refractive index of the half wave plate layer 821 for the extraordinary ray is equal to the refractive index of the optical compensation layer 9 for the extraordinary ray.
In some of the above embodiments, by controlling the refractive index of the quarter-wave plate layer 811 for the extraordinary rays to be equal to the refractive index of the optical compensation layer 9 for the extraordinary rays and/or the refractive index of the half-wave plate layer 821 for the extraordinary rays to be equal to the refractive index of the optical compensation layer 9 for the extraordinary rays, the compensation effect of the optical compensation layer 9 for the problem of the phase retardation film 8 that reduces the phase retardation amount of the light in the above-mentioned set wavelength band can be further improved.
In some embodiments, referring to FIGS. 16-19, the thickness L of the quarter-wave plate layer 8112Is 1-3 μm.
Wherein the thickness L of the quarter-wave plate layer 8112For example, the size of the quarter-wave plate layer 811 in the direction Z perpendicular to the display panel 1.
It should be noted that in the description of some of the above embodiments, the range of values is 1 μm to 3 μm, and includes both endpoints and all values therebetween, such as 1 μm, 1.5 μm, 2 μm, 2.5 μm and 3 μm.
In some embodiments, the thickness of the quarter-wave plate layer 811 is limited, so that the thickness of the display module 100 can be controlled, and the display module 100 can have good bending performance.
In some embodiments, referring to fig. 16-19, the thickness L of the half-wave plate layer 8213Is 1-3 μm. Wherein the thickness L of the half wave plate layer 8213For example, may be the dimension of the half-wave plate layer 821 in the direction Z perpendicular to the display panel 1.
It should be noted that in the description of some of the above embodiments, the range of values is 1 μm to 3 μm, and includes both endpoints and all values therebetween, such as 1 μm, 1.5 μm, 2 μm, 2.5 μm and 3 μm.
In some embodiments, the thickness of the half-wave plate layer 821 is limited to control the thickness of the whole display module 100, so as to ensure that the display module 100 has good bending performance.
It should be noted that the optical compensation layer 9 may be disposed in various ways, including, but not limited to, the following examples.
In some examples, referring to fig. 17, the optical compensation layer 9 is located between the first and second phase retardation films 81 and 82.
In other examples, referring to fig. 18, an optical compensation layer 9 is positioned between at least one phase retardation film 8 and the linearly polarizing layer 2.
In still other examples, referring to fig. 10, 13, 14, 16, and 19, the optical compensation layer 9 is located between at least one phase retardation film 8 and the display panel 1.
For example, referring to fig. 19, in a case that the display module 100 includes the touch structure 5, the optical compensation layer 9 is located between at least one phase retardation film 8 and the touch structure 5.
In summary, in the display module 100 provided in some embodiments of the present disclosure, the optical compensation layer 9 is disposed, and the optical axis of the optical compensation layer 9 is controlled to be perpendicular to the plane where the optical compensation layer is located, so that the optical axis of the optical compensation layer 9 is perpendicular to the optical axis of the phase retardation film 8. In this case, as the viewing angle gradually increases, the phase retardation of the optical compensation layer 9 for the light in the set wavelength band increases, so that the problem of the phase retardation film 8 for the light in the set wavelength band decreasing at a large viewing angle can be compensated, thereby avoiding the problem of the display device 1000 generating powder at a large viewing angle, and finally improving the display effect of the display device 1000 at a full viewing angle.
On the basis, by arranging the quarter-wave plate layer 811 and the half-wave plate layer 821 at the same time, the inverse dispersion effect that the wavelength is in direct proportion to the phase difference can be realized, so that circular polarization is realized for the external environment light of the full waveband, the problem that the display device 1000 is purple is finally solved, and the display effect of the display device 1000 is further improved.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art will appreciate that changes or substitutions within the technical scope of the present disclosure are included in the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (15)
1. A display module, comprising:
a display panel;
the circular polarization layer is positioned on the light emitting side of the display panel and comprises a linear polarization layer and at least one phase delay film; the at least one layer of phase delay film is positioned on one side of the linear polarization layer close to the display panel; and the number of the first and second groups,
the optical compensation layer is positioned on one side, close to the display panel, of the linear polarization layer and is arranged in a stacking mode with the phase delay film; the optical axis of the optical compensation layer is perpendicular to the plane of the optical compensation layer.
2. The display module of claim 1,
the refractive index of the optical compensation layer in a first axis is equal to the refractive index of the optical compensation layer in a second axis;
wherein the first axis and the second axis are both located within the optical compensation layer plane, and the first axis is perpendicular to the second axis.
3. The display module of claim 2,
the optical compensation layer is a + C compensation film layer.
4. The display module of claim 2,
the refractive index of the optical compensation layer to the ordinary rays is 1.0-2.0; the refractive index of the optical compensation layer to the extraordinary ray is 1.0-2.0;
the difference value between the refractive index of the optical compensation layer to the extraordinary ray and the refractive index of the optical compensation layer to the ordinary ray is 0-0.3.
5. The display module of claim 1,
the thickness of the optical compensation layer is 1-3 μm.
6. The display module according to any one of claims 1 to 5, wherein the optical compensation layer comprises:
the optical axis of liquid crystal molecules in the reactive liquid crystal layer is vertical to the plane of the reactive liquid crystal layer; and the combination of (a) and (b),
the first alignment film is positioned on one side, close to the display panel, of the reactive liquid crystal layer and is configured to align liquid crystal molecules in the reactive liquid crystal layer.
7. The display module according to any one of claims 1 to 5, wherein the at least one phase retardation film comprises:
a first phase retardation film including a quarter-wave plate layer and a second alignment film which are stacked; the optical axis of the liquid crystal molecules in the quarter-wave plate layer is parallel to the plane where the quarter-wave plate layer is located; the second alignment film is configured to align liquid crystal molecules in the quarter-wave plate layer; and the combination of (a) and (b),
the second phase delay film is positioned on one side, far away from the display panel, of the first phase delay film and comprises a half wave plate layer and a third alignment film which are arranged in a stacked mode; the optical axis of the liquid crystal molecules in the half wave plate layer is parallel to the plane where the half wave plate layer is located; the third alignment film is configured to align liquid crystal molecules in the half-wave plate layer.
8. The display module of claim 7,
an included angle between an optical axis of liquid crystal molecules in the quarter-wave plate layer and an absorption axis of the linear polarization layer is 75 +/-5 degrees;
and an included angle between the optical axis of the liquid crystal molecules in the half wave plate layer and the absorption axis of the linear polarization layer is 15 +/-5 degrees.
9. The display module of claim 7,
the difference value between the refractive index of the quarter-wave plate layer to the ordinary ray and the refractive index of the optical compensation layer to the ordinary ray is 0-0.1; and/or the presence of a gas in the gas,
the difference value between the refractive index of the half wave plate layer to the ordinary ray and the refractive index of the optical compensation layer to the ordinary ray is 0-0.1.
10. The display module of claim 9,
the refractive index of the quarter-wave plate layer to the ordinary ray is equal to that of the optical compensation layer to the ordinary ray; and/or the presence of a gas in the gas,
the refractive index of the half wave plate layer to the ordinary ray is equal to that of the optical compensation layer to the ordinary ray.
11. The display module of claim 7,
the difference value between the refractive index of the quarter-wave plate layer to the extraordinary ray and the refractive index of the optical compensation layer to the extraordinary ray is 0-0.1; and/or the presence of a gas in the gas,
the difference value between the refractive index of the half wave plate layer to the extraordinary ray and the refractive index of the optical compensation layer to the extraordinary ray is 0-0.1.
12. The display module of claim 11,
the refractive index of the quarter-wave plate layer to the extraordinary ray is equal to that of the optical compensation layer to the extraordinary ray; and/or the presence of a gas in the gas,
the refractive index of the half wave plate layer to the extraordinary ray is equal to that of the optical compensation layer to the extraordinary ray.
13. The display module of claim 7,
the thickness of the quarter-wave plate layer is 1-3 mu m; and/or the presence of a gas in the gas,
the thickness of the half wave plate layer is 1-3 mu m.
14. The display module of claim 7, wherein the optical compensation layer is configured to be disposed in any one of:
the optical compensation layer is positioned between the first layer of phase retardation film and the second layer of phase retardation film; or the like, or, alternatively,
the optical compensation layer is positioned between the at least one layer of phase retardation film and the linear polarization layer; or the like, or, alternatively,
the optical compensation layer is positioned between the at least one phase retardation film and the display panel.
15. A display device, comprising:
the display module according to any one of claims 1 to 14.
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| WO2024082512A1 (en) * | 2022-10-19 | 2024-04-25 | 武汉华星光电半导体显示技术有限公司 | Display panel and display apparatus |
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| WO2024082512A1 (en) * | 2022-10-19 | 2024-04-25 | 武汉华星光电半导体显示技术有限公司 | Display panel and display apparatus |
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