CN109065578B - Display module and display device - Google Patents
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- 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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Abstract
The invention discloses a display module and a display device, which relate to the technical field of display and comprise: the array substrate, the organic light-emitting structure, the cover plate glass and the circular polarizer which are sequentially arranged on the array substrate along the direction vertical to the plane of the array substrate, and the organic light-emitting structure positioned on the array substrateA viewing angle compensation layer between the optical structure and the circular polarizer, the circular polarizer including a phase difference film; the refractive indexes of the viewing angle compensation layers in a three-dimensional coordinate system are respectively n1x、n1y、n1zThe refractive indexes of the retardation films in a three-dimensional coordinate system are respectively n2x、n2y、n2zAnd n2x＞n2y≥n2z(ii) a Wherein n1z＞n2zAnd/or, n1x＜n2x(ii) a The refractive index of the display module in a three-dimensional coordinate system is n0x、n0y、n0z(ii) a The refractive index of the display module in a three-dimensional coordinate system satisfies n0x＞n0z＞n0y. Therefore, the phase difference brought under different visual angles is reduced, and the visual experience effect of a user is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display module and a display device.
Background
In recent years, Organic Light-Emitting diodes (OLEDs) have become a very popular flat panel display industry in the sea and abroad, which is known as the next generation of "star" flat panel display technology, mainly because OLEDs have the characteristics of low power consumption, self-luminescence, fast reaction time, high luminous efficiency, thin panel thickness, capability of manufacturing large-sized and bendable panels, simple manufacturing process, low cost, and the like. The organic electroluminescent device includes a plurality of organic light emitting structures including a reflective electrode (anode), a light emitting material layer, and a semi-reflective electrode (cathode). Holes and electrons are injected into the light emitting material layer from the anode and the cathode, respectively, and energy is generated when excitons are generated in combination in the light emitting material layer and the excitons are shifted from an excited state to a ground state, thereby realizing light emission.
In general, the organic electroluminescent display device has a high reflectance due to the presence of the reflective electrode and the semi-reflective electrode. Due to reflection of external light, in a display state, light rays reflected by the reflecting electrode and the semi-reflecting electrode can be mixed besides light rays emitted by the display device, so that the contrast of the display device is greatly reduced, therefore, a circular polarizer is usually introduced into the display device to reduce the reflectivity of the display device so as to improve the contrast of the display device, but after the circular polarizer is introduced, the phase difference of the display device brought by different visual angles is greatly different, and the larger emission color difference appears at a large visual angle (oblique angle), so that the visual experience effect of a user is influenced.
Disclosure of Invention
In view of the above, the present invention provides a display module and a display device, in which a viewing angle compensation layer is introduced into the display module, and the refractive index of the display module and the refractive index of the display device in a three-dimensional coordinate system satisfy n0 through the compensation effect of the viewing angle compensation layerx＞n0z＞n0yThe difference that phase difference exists of greatly reduced display module assembly and display device under different visual angles reduces reflection colour difference under the big visual angle to be favorable to promoting display module assembly and display device's visual angle characteristic, promote user's visual experience effect.
In a first aspect, the present application provides a display module, including: the array substrate, along the organic light-emitting structure, the cover plate glass and the circular polaroid which are arranged on the array substrate in sequence in the direction perpendicular to the plane of the array substrate, wherein the circular polaroid comprises a phase difference film;
the organic light-emitting structure further comprises a visual angle compensation layer, and the visual angle compensation layer is positioned between the organic light-emitting structure and the circular polarizer;
the refractive indexes of the viewing angle compensation layers in a three-dimensional coordinate system are respectively n1x、n1y、n1zThe refractive indexes of the retardation films of the circular polarizer in a three-dimensional coordinate system are n2 respectivelyx、n2y、n2zAnd satisfies n2x＞n2y≥n2z(ii) a Wherein n1z＞n2zAnd/or, n1x＜n2x；
The refractive index of the display module in a three-dimensional coordinate system is n0x、n0y、n0z(ii) a The refractive index of the display module in a three-dimensional coordinate system meets n0x＞n0z＞n0y。
In a second aspect, the present application provides a display device, including a display module, the display module being the display module provided by the present application.
Compared with the prior art, the display module and the display device provided by the invention at least realize the following beneficial effects:
in the display module and the display device provided by the application, the visual angle compensation layer is introduced between the organic light-emitting structure and the circular polarizer, and the refractive index of the phase difference film of the circular polarizer in a three-dimensional coordinate system meets n2x＞n2y≥n2zAnd n1 in the introduced viewing angle compensation layerz＞n2zAnd/or, n1x＜n2xThis can effectively compensate for the n2 in the retardation film of circular polarizerzSmaller or n2xThe large phase difference caused by the large phase difference under different viewing angles enables the refractive indexes of the display module and the display device in a three-dimensional coordinate system to satisfy n0x＞n0z＞n0yTherefore, the phase difference of the display module and the display device under a large visual angle is reduced, and the reflection chromatic aberration under the large visual angle is reduced, so that the visual angle characteristics of the display module and the display device are improved, and the visual experience effect of a user is improved.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a top view of a display module according to an embodiment of the present disclosure;
FIG. 2 is an AA' cross-sectional view of the display module shown in FIG. 1;
fig. 3 is a refractive index representation diagram of a retardation film of a circular polarizer according to an embodiment of the present disclosure in a three-dimensional coordinate system;
FIG. 4 is a refractive index representation of a viewing angle compensation layer provided in an embodiment of the present application in a three-dimensional coordinate system;
fig. 5 is a refractive index representation diagram of a display module provided in an embodiment of the present application in a three-dimensional coordinate system;
FIG. 6 is a cross-sectional view of another AA' of the display module shown in FIG. 1;
FIG. 7 is a cross-sectional view of another AA' of the display module shown in FIG. 1;
FIG. 8 is a cross-sectional view of another AA' of the display module shown in FIG. 1;
FIG. 9 is a cross-sectional view of another AA' of the display module shown in FIG. 1;
FIG. 10 is a schematic diagram illustrating a structure of a circular polarizer in a display module according to an embodiment of the present disclosure;
fig. 11 is a schematic diagram illustrating a working principle of a circular polarizer in a display module according to an embodiment of the present disclosure when the circular polarizer includes a λ/4 retardation film;
fig. 12 is a schematic view illustrating another configuration of a circular polarizer in a display module according to an embodiment of the present disclosure;
FIG. 13 is a schematic view showing the operation of a circular polarizer including a λ/2 retardation film and a λ/4 retardation film;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the prior art, an organic light emitting structure generally includes a reflective electrode (anode), a light emitting material layer, and a semi-reflective electrode (cathode). Holes and electrons are injected into the light emitting material layer from the anode and the cathode, respectively, and energy is generated when excitons are generated in combination in the light emitting material layer and the excitons are shifted from an excited state to a ground state, thereby realizing light emission. In general, the organic electroluminescent display device has a high reflectance due to the presence of the reflective electrode and the semi-reflective electrode. Because of the reflection of external light, in a display state, light rays reflected by the reflecting electrode and the semi-reflecting electrode can be mixed besides light rays emitted by the display device, so that the contrast of the display device is greatly reduced, and therefore, a circular polarizer is usually introduced into the display device to reduce the reflectivity of the display device so as to improve the contrast of the display device.
In view of the above, the present invention provides a display module and a display device, in which a viewing angle compensation layer is introduced into the display module, and the refractive index of the display module and the refractive index of the display device in a three-dimensional coordinate system satisfy n0 through the compensation effect of the viewing angle compensation layerx＞n0z＞n0yThe difference that phase difference exists of greatly reduced display module assembly and display device under different visual angles reduces reflection colour difference under the big visual angle to be favorable to promoting display module assembly and display device's visual angle characteristic, promote user's visual experience effect.
Fig. 1 is a top view of a display module according to an embodiment of the present disclosure, fig. 2 is an AA' cross-sectional view of the display module according to fig. 1, and with reference to fig. 1 and fig. 2, a display module 100 according to an embodiment of the present disclosure includes: the array substrate 10, the organic light emitting structure 20, the cover glass 30 and the circular polarizer 50 are sequentially arranged on the array substrate 10 along a direction perpendicular to a plane of the array substrate 10, and the circular polarizer 50 comprises a phase difference film 52;
a viewing angle compensation layer 40 is further included, the viewing angle compensation layer 40 is positioned between the organic light emitting structure 20 and the circular polarizer 50;
the refractive indexes of the viewing angle compensation layers 40 in a three-dimensional coordinate system are respectively n1x、n1y、n1zThe refractive indices of the retardation film 52 of the circular polarizer 50 in the three-dimensional coordinate system are n2x、n2y、n2zAnd satisfies n2x＞n2y≥n2z(ii) a Wherein n1z＞n2zAnd/or, n1x＜n2x；
The refractive index of the display module 100 in the three-dimensional coordinate system is n0x、n0y、n0z(ii) a The refractive index of the display module 100 in the three-dimensional coordinate system satisfies n0x＞n0z＞n0y。
Specifically, referring to fig. 1 and fig. 2, the viewing angle compensation layer 40 is introduced into the display module 100, and the viewing angle compensation layer 40 compensates for the phase difference at different viewing angles caused by the introduction of the circular polarizer 50. In this embodiment, n1 represents the refractive index of the viewing angle compensation layer 40, n2 represents the refractive index of the retardation film 52 in the circular polarizer 50, n0 represents the refractive index of the display module 100, and after introducing the subscript, taking the viewing angle compensation layer 40 as an example, n1xN1 representing the refractive index of the viewing angle compensating layer 40 in the x-direction in a three-dimensional coordinate systemyRepresenting the refractive index of the viewing angle compensating layer 40 in the y-direction, n1zThe refractive index of the viewing angle compensation layer 40 in the z direction, the refractive index of the retardation film 52 of the circular polarizer 50 and the refractive index of the display module 100 are similar to each other, and thus will not be explained in detail. The viewing angle compensation function of the viewing angle compensation layer 40 is described in detail with reference to fig. 3-5, in which fig. 3 is a representation of the refractive index of the retardation film 52 of the circular polarizer 50 in the three-dimensional coordinate system, and fig. 4 is a representation of the refractive index of the viewing angle compensation layer 40 in the three-dimensional coordinate systemReferring to fig. 5, which is a refractive index representation diagram of a display module 100 in a three-dimensional coordinate system according to an embodiment of the present disclosure, it can be seen from fig. 3 that the refractive index of the retardation film 52 of the circular polarizer 50 in the three-dimensional coordinate system satisfies n2x＞n2y≥n2zThe whole body is in a flat disc shape, so that the phase difference caused by different visual angles is large; as can be seen from FIG. 4, the refractive index of the viewing angle compensating layer 40 in the three-dimensional coordinate system is compared with that of the retardation film 52, n1z＞n2zAnd/or, n1x＜n2xThe refractive index of the viewing angle compensation layer 40 in the z direction is larger than the refractive index of the retardation film 52 of the circular polarizer 50 in the z direction, or the refractive index of the viewing angle compensation layer 40 in the x direction is smaller than the refractive index of the retardation film 52 of the circular polarizer 50 in the x direction, after the light rays sequentially pass through the viewing angle compensation layer 40 and the retardation film 52 of the circular polarizer 50, the viewing angle compensation layer 40 compensates the refractive index of the retardation film 52 of the circular polarizer 50 in the z direction and/or the x direction, so that the refractive index of the whole display module 100 in the three-dimensional coordinate system satisfies n0x＞n0z＞n0yReferring to fig. 5, the whole of the three-dimensional coordinate system looks more spherical, so that the phase difference of the display module 100 at different viewing angles is greatly reduced, the reflection color difference at a large viewing angle is reduced, the black state at a wide viewing angle is blacker, the viewing angle characteristic of the display module 100 is improved, and the visual experience effect of a user is improved.
Please refer to fig. 1, the organic light emitting structure 20 provided in the embodiment of the present disclosure may include an anode layer 21, a light emitting material layer 22, and a cathode layer 23 sequentially disposed, the array substrate 10 includes a thin film transistor 11, and the anode layer 21 is electrically connected to a drain of the thin film transistor 11. After the thin film transistor 11 is turned on, holes and electrons are injected into the light emitting material layer 22 from the anode layer 21 and the cathode layer 23, respectively, under the driving of an applied voltage, and the holes and the electrons meet and recombine in the light emitting material layer 22 to release energy, and then the energy is transferred to molecules of the organic light emitting substance in the light emitting material to make the molecules of the organic light emitting substance transition from a ground state to an excited state. The excited state is unstable, the excited molecules return to the ground state from the excited state, and radiation transition generates a light-emitting phenomenon, so that the display of a picture can be realized by the organic light-emitting diode based on the light-emitting phenomenon. In addition, a thin film encapsulation layer 60 is further disposed on a side of the organic light emitting structure 20 away from the array substrate 10, and the organic light emitting structure 20 is encapsulated by the thin film encapsulation layer 60, so that external moisture and oxygen are prevented from entering the organic light emitting structure 20 to affect the performance of the organic light emitting structure 20.
Optionally, in the display module 100 provided in the embodiment of the present application, the viewing angle compensation layer 40 is a positive liquid crystal layer, and a refractive index of the positive liquid crystal layer in a three-dimensional coordinate system satisfies n1z＞n1x＝n1y。
Specifically, in the display module 100 provided in the embodiment of the present application, a positive liquid crystal layer may be used as the viewing angle compensation layer 40, and the positive liquid crystal layer may be formed by photo-alignment and curing, and the refractive index of the positive liquid crystal in a three-dimensional coordinate system satisfies n1z＞n1x＝n1yFor example, referring to FIG. 4, since the refractive index of the retardation film 52 of the circular polarizer 50 in the three-dimensional coordinate system satisfies n2x＞n2y≥n2zThe refractive index of the liquid crystal layer in the z direction is the minimum, so that the liquid crystal layer is in a flat disc shape as shown in fig. 3 in a three-dimensional coordinate system, and after the visual angle compensation layer 40 formed by the positive liquid crystal layer is introduced, because the refractive index of the positive liquid crystal layer in the z direction is the maximum, and the refractive indexes in the x direction and the y direction are smaller, after light passes through the visual angle compensation layer 40 and the circular polarizer 50, the refractive index of the retardation film 52 of the circular polarizer 50 in the z direction is equivalently weakened, that is, the refractive index of the whole display module 100 in the three-dimensional coordinate system is closer to a spherical shape, see fig. 5, so that the phase difference of the display module 100 in different visual angles is favorably reduced, the reflection color difference of the display module in a large visual angle is favorably reduced, the black state of the display module 100 in a wide visual angle is darker.
In the display module 100 provided in the embodiment of the present application, the viewing angle compensation layer 40 adopts a positive liquid crystal layer, and optionally, the viewing angle compensation layer 40 is a negative liquid crystal layer, and the refractive index of the negative liquid crystal layer in the three-dimensional coordinate system is fullFoot n1z≥n1x＞n1y。
Specifically, in the display module 100 provided in the embodiment of the present application, a negative liquid crystal layer may be used as the viewing angle compensation layer 40, and the negative liquid crystal layer may be formed by photo-alignment and curing, and the refractive index of the negative liquid crystal in the three-dimensional coordinate system satisfies n1z≥n1x＞n1ySince the refractive index of the retardation film 52 of the circular polarizer 50 in the three-dimensional coordinate system satisfies n2x＞n2y≥n2zThe refractive index of the negative liquid crystal layer in the z direction is the smallest, so that the negative liquid crystal layer is in a flat disc shape as shown in fig. 3 in a three-dimensional coordinate system, and after the visual angle compensation layer 40 formed by the negative liquid crystal layer is introduced, because the refractive index of the negative liquid crystal layer in the z direction is the largest, and the refractive index of the negative liquid crystal layer in the y direction is the smallest, so that after light passes through the visual angle compensation layer 40 and the circular polarizer 50, the refractive index of the phase difference film 52 of the circular polarizer 50 in the z direction is equivalently weakened, that is, the refractive index of the whole display module 100 in the three-dimensional coordinate system is closer to a spherical shape, see fig. 5, so that the phase difference of the display module 100 in different visual angles is favorably reduced, the reflection color difference under a large visual angle is favorably reduced, the black state under a wide visual angle is darker.
Optionally, the thickness of the viewing angle compensation layer 40 introduced into the display module 100 provided in the embodiment of the present application is D1, and 0 μm < D1 ≦ 20 μm. Specifically, when the thickness of the viewing angle compensation layer 40 is set to be 20 μm or less in the embodiment of the present application, on one hand, the thickness dimension is small, which does not affect the overall thickness of the display module 100, and is beneficial to the thinning requirement of the display module 100 while reducing the difference between the lower positions at different viewing angles; on the other hand, when the thickness of the viewing angle compensation layer 40 is set to 20 μm or less, it is also advantageous to avoid the reflection color from being shifted to black enough, thereby making the black state in a wide viewing angle darker.
Alternatively, referring to fig. 2, the viewing angle compensation layer 40 is located on a side of the cover glass 30 close to the array substrate 10, or referring to fig. 6, the viewing angle compensation layer 40 is located on a side of the cover glass 30 far from the array substrate 10, and fig. 6 is another AA' cross-sectional view of the display module 100 provided in fig. 1.
Specifically, fig. 2 and fig. 6 respectively show two structural diagrams after the viewing angle compensation layer 40 is introduced into the display module 100, in the embodiment shown in fig. 2, the viewing angle compensation layer 40 is located between the cover glass 30 and the organic light emitting structure 20, and in the embodiment shown in fig. 6, the viewing angle compensation layer 40 is located between the cover glass 30 and the circular polarizer 50. In the two structures, after the light emitted by the organic light emitting structure 20 is refracted by the viewing angle compensation layer 40 and the retardation film 52 of the circular polarizer 50, the refractive index of the display module 100 in the three-dimensional coordinate system is shown in the form shown in fig. 5, which is beneficial to reducing the retardation difference of the display module 100 at different viewing angles, reducing the reflection color difference at a large viewing angle, and making the black state at a wide viewing angle darker.
The display module 100 shown in the embodiments shown in fig. 2 and fig. 6 does not include the touch function layer 70, and the structure of the display module 100 including the touch function layer 70 will be described next.
Optionally, fig. 7 is another AA ' cross-sectional view of the display module 100 provided in fig. 1, fig. 8 is another AA ' cross-sectional view of the display module 100 provided in fig. 1, and fig. 9 is another AA ' cross-sectional view of the display module 100 provided in fig. 1, the display module 100 provided in the embodiment of the present application further includes a touch functional layer 70, and the touch functional layer 70 is located on a side of the cover glass 30 away from the array substrate 10;
referring to fig. 7, the viewing angle compensation layer 40 is located between the cover glass 30 and the touch function layer 70, or referring to fig. 8, the viewing angle compensation layer 40 is located on the side of the touch function layer 70 away from the array substrate 10, or referring to fig. 9, the viewing angle compensation layer 40 is located on the side of the cover glass 30 close to the array substrate 10.
Specifically, fig. 7 to 9 illustrate several configurations of the display module 100 with touch function after the viewing angle compensation layer 40 is introduced, the touch function layer 70 is disposed between the cover glass 30 and the circular polarizer 50, and the viewing angle compensation layer 40 may be located on any film layer between the organic light emitting structure 20 and the circular polarizer 50, such as the several cases illustrated in fig. 7 to 9. The display module 100 with the structure can realize the touch function, is favorable for reducing the phase difference of the display module 100 at different viewing angles, and is favorable for reducing the reflection color difference at a large viewing angle, so that the black state at the wide viewing angle is blacker.
The structure and operation of the circular polarizer 50 will be explained below.
Optionally, fig. 10 is a schematic structural diagram of the circular polarizer 50 in the display module 100 according to the embodiment of the present disclosure, referring to fig. 10, the circular polarizer 50 further includes a polarizing film 51 besides the retardation film 52, the polarizing film 51 and the retardation film 52 are stacked in a direction perpendicular to the array substrate 10, and the polarizing film 51 is disposed on a side of the retardation film 52 away from the array substrate 10, where the polarizing film 51 and the retardation film 52 are separated by a glue layer 53. External natural light becomes the line polarisation after polarizing film 51, the line polarisation forms first circular polarisation through the effect of phase difference membrane 52, first circular polarisation becomes second circular polarisation after reflecting, the second circular polarisation becomes the line polarisation of perpendicular to polarizing film 51 through phase difference membrane 52 again, thereby absorbed by polarizing film 51, can not the outgoing, thereby effectively prevent to get into the external environment light reflection of circular polaroid 50 and go out, avoid the existence of reverberation to cause the puzzlement in the user's use, be favorable to promoting user's visual experience effect.
Alternatively, the retardation film 52 in the embodiment shown in fig. 10 includes a λ/4 retardation film 521, and the retardation film 52 may be formed using a reverse wavelength dispersion material. Fig. 11 is a schematic diagram illustrating the operation of the circular polarizer 50 in the display module 100 according to the present embodiment when the circular polarizer includes the λ/4 phase difference film 521, please refer to fig. 10 and 11, in which the external ambient light is changed into the linearly polarized light a under the action of the polarizing film 51, and the polarization direction of the linearly polarized light a is parallel to the polarizing film 51; the linearly polarized light A passes through the lambda/4 phase difference film 521 and becomes circularly polarized light B (assuming left-handed polarization); after the left-handed circularly polarized light A passes through the action of the reflecting layer (i.e. the anode layer 21 of the organic light-emitting structure 20), the direction of the left-handed circularly polarized light A can be changed by 180 degrees according to the Fresnel formula, and the phase delay pi is changed into circularly polarized light C; the circularly polarized light C passes through the λ/4 phase difference film 521 and becomes linearly polarized light D, and the polarization direction of the linearly polarized light D is perpendicular to the linearly polarized light a, and is absorbed by the polarizing film 51 and does not exit. Therefore, the circular polarizer 50 including the λ/4 retardation film 521 can effectively prevent the external ambient light entering the display module 100 from being reflected, and the reflected light is prevented from affecting the normal display of the display module 100, so that the user can be prevented from being puzzled when the display module 100 is used, and the visual experience effect of the user is improved.
Alternatively, as shown in fig. 12, which is another schematic configuration diagram of the circular polarizer 50 in the display module 100 provided in the embodiment of the present application, the retardation film 52 includes a λ/4 retardation film 521 and a λ/2 retardation film 522 separated by a glue layer 53, and the λ/2 retardation film 522 is disposed on a side of the λ/4 retardation film 521 close to the polarizing film 51. Fig. 13 is a schematic diagram illustrating the operation of the circular polarizer 50 including the λ/2 retardation film 522 and the λ/4 retardation film 521, with reference to fig. 12 and 13, the external ambient light is changed into linearly polarized light a under the action of the polarizing film 51, and the polarization direction of the linearly polarized light a is parallel to the polarizing film 51; the linearly polarized light a first passes through the λ/2 retardation film 522 to become linearly polarized light E, which is deflected by an angle α (where α is an acute angle) with respect to the linearly polarized light a; the linearly polarized light E passes through the λ/4 phase difference film 521 to become circularly polarized light F (assuming left-handed); after the left-handed circularly polarized light F passes through the action of the reflecting layer (i.e., the anode layer 21 of the organic light emitting structure 20), the direction thereof is changed by 180 degrees as known from the Fresnel formula, and the phase retardation pi is changed into circularly polarized light G; the circularly polarized light G becomes a linearly polarized light H after passing through the lambda/4 phase difference film 521, and the polarization direction of the linearly polarized light H is vertical to the linearly polarized light E; the linearly polarized light H passes through the λ/2 retardation film 522 and becomes linearly polarized light I, the polarization direction of which is perpendicular to the linearly polarized light a, and the linearly polarized light I is absorbed by the polarizing film 51 and is not emitted. Therefore, the circular polarizer 50 including the λ/2 retardation film 522 and the λ/4 retardation film 521 can also effectively prevent the external ambient light entering the display module 100 from being reflected, and prevent the reflected light from affecting the normal display of the display module 100, so as to avoid causing trouble to the user when using the display module 100, thereby being beneficial to improving the visual experience of the user.
Optionally, in the display module 100 provided in the embodiment of the present application, the thickness of the circular polarizer 50 is D2, and D2 is greater than or equal to 50 μm and less than or equal to 180 μm.
In the prior art, the thickness of the circular polarizer 50 is usually set to be 140 μm to 200 μm, and the thickness of the circular polarizer 50 in the embodiment of the present application is 50 μm or more and D2 or more and 180 μm or less, which is smaller than the prior art, thereby being beneficial to reducing the overall thickness of the display module 100 and being beneficial to realizing the requirement of thinning the display module.
Based on the same inventive concept, the present application further provides a display device, fig. 14 is a schematic structural diagram of the display device provided in the embodiment of the present application, referring to fig. 14, the display device 200 in the present application further includes a display module 100, and the display module 100 is the display module 100 in the embodiment of the present application. The display device 200 provided by the present application may be: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. In the present application, the embodiment of the display device 200 can refer to the embodiment of the display module 100, and repeated descriptions are omitted here.
By the embodiment, the display module and the display device provided by the invention at least realize the following beneficial effects:
in the display module and the display device provided by the application, the visual angle compensation layer is introduced between the organic light-emitting structure and the circular polarizer, and the refractive index of the phase difference film of the circular polarizer in a three-dimensional coordinate system meets n2x＞n2y≥n2zAnd n1 in the introduced viewing angle compensation layerz＞n2zAnd/or, n1x＜n2xThis can effectively compensate for the n2 in the circular polarizerzSmaller or n2xThe large phase difference caused by the large phase difference under different viewing angles enables the refractive indexes of the display module and the display device in a three-dimensional coordinate system to satisfy n0x＞n0z＞n0yTherefore, the phase difference of the display module and the display device under a large visual angle is reduced, and the reflection chromatic aberration under the large visual angle is reduced, so that the visual angle characteristics of the display module and the display device are improved, and the visual experience effect of a user is improved.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (9)
1. A display module, comprising: the array substrate, the organic light-emitting structure, the cover plate glass, the circular polarizer and the touch control functional layer are sequentially arranged on the array substrate along the direction perpendicular to the plane of the array substrate, the circular polarizer comprises a phase difference film, and the touch control functional layer is positioned on one side, away from the array substrate, of the cover plate glass;
the array substrate is provided with a circular polarizer, and the array substrate is provided with an organic light-emitting structure and a touch control functional layer;
the refractive indexes of the viewing angle compensation layers in a three-dimensional coordinate system are respectively n1x、n1y、n1zThe refractive indexes of the retardation films of the circular polarizer in a three-dimensional coordinate system are n2 respectivelyx、n2y、n2zAnd satisfies n2x＞n2y≥n2z(ii) a Wherein n1z＞n2zAnd/or, n1x＜n2x；
The refractive index of the display module in a three-dimensional coordinate system is n0x、n0y、n0z(ii) a The refractive index of the display module in a three-dimensional coordinate system meets n0x＞n0z＞n0y。
2. The display module according to claim 1, wherein the viewing angle compensation layer is a positive liquid crystal layer having a refractive index n1 in a three-dimensional coordinate systemz＞n1x＝n1y。
3. The display module of claim 1, wherein the viewing angle compensation layer is a negative liquid crystal layer having a refractive index n1 in a three-dimensional coordinate systemz≥n1x＞n1y。
4. The display module of claim 1, wherein the viewing angle compensation layer has a thickness D1, 0 μm < D1 ≦ 20 μm.
5. The display module according to claim 1, wherein the circular polarizer further comprises a polarizing film, the polarizing film and the retardation film are stacked in a direction perpendicular to the array substrate, and the polarizing film is disposed on a side of the retardation film away from the array substrate.
6. The display module of claim 1, wherein the retardation film comprises a λ/4 retardation film.
7. The display module of claim 1, wherein the retardation film comprises a λ/4 retardation film and a λ/2 retardation film separated by a glue layer.
8. The display module of claim 1, wherein the circular polarizer has a thickness D2, 50 μm D2 μm 180 μm.
9. A display device, comprising: a display module according to any one of claims 1 to 8.
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