CN114265226A - Display module and display device - Google Patents
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- CN114265226A CN114265226A CN202111646392.5A CN202111646392A CN114265226A CN 114265226 A CN114265226 A CN 114265226A CN 202111646392 A CN202111646392 A CN 202111646392A CN 114265226 A CN114265226 A CN 114265226A
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Abstract
The disclosure provides a display module and a display device. This display module assembly includes: the display panel comprises a first sub-pixel; the first chiral liquid crystal pattern is arranged on the light outgoing side of the first sub-pixel, can reflect one kind of circularly polarized light and can transmit the other kind of circularly polarized light for two kinds of circularly polarized light with opposite rotation directions and the wavelength of the circularly polarized light is in a first wave band, and the first wave band is positioned in the emergent light wave band of the first sub-pixel; the circular polarizer is arranged on one side, back to the display panel, of the first chiral liquid crystal pattern, and the handedness of circularly polarized light transmitted by the circular polarizer is the same as that of circularly polarized light transmitted by the first chiral liquid crystal pattern; and the light reflecting structure is arranged on the light emitting side of the display panel and is used for reflecting the light with the wavelength positioned in the second waveband, wherein the light with the wavelength positioned in the first waveband and the light with the wavelength positioned in the second waveband are complementary colored light. The present disclosure can reduce power consumption.
Description
Technical Field
The disclosure relates to the technical field of display, in particular to a display module and a display device.
Background
With the improvement of living standard, the display panel attracts more and more attention. The display panel includes an OLED display panel, a QLED display panel, and the like. The OLED display panel has a series of advantages of all-solid-state structure, self luminescence, high response speed, high brightness, full viewing angle, flexible display and the like. The QLED display panel has the advantages of narrow light-emitting spectrum, adjustable light-emitting wavelength and the like. However, the current display panel has large power consumption.
Disclosure of Invention
An object of the present disclosure is to provide a display module and a display device, which can reduce power consumption.
According to an aspect of the present disclosure, there is provided a display module including:
a display panel including a plurality of sub-pixels including a first sub-pixel;
the first chiral liquid crystal pattern is arranged on the light outgoing side of the first sub-pixel, can reflect one circularly polarized light and can transmit the other circularly polarized light for two circularly polarized lights with opposite rotation directions and the wavelength in a first wave band, and the first wave band is positioned in the outgoing light wave band of the first sub-pixel;
the circular polarizer is arranged on one side, back to the display panel, of the first chiral liquid crystal pattern, and the handedness of circularly polarized light transmitted by the circular polarizer is the same as that of circularly polarized light transmitted by the first chiral liquid crystal pattern;
and the light reflecting structure is arranged on the light emitting side of the display panel and used for reflecting light with the wavelength positioned in the second waveband, wherein the wavelength is positioned in the light with the first waveband and the wavelength is positioned in the light with the second waveband, and the light with the second waveband is complementary colored light.
Further, the light reflecting structure includes a second chiral liquid crystal pattern.
Further, the second chiral liquid crystal pattern is located between the circular polarizer and the display panel.
Further, the plurality of sub-pixels further comprise a second sub-pixel, and the emergent light color of the second sub-pixel is different from the emergent light color of the first sub-pixel; and part of the second chiral liquid crystal pattern is positioned in the emergent light range of the second sub-pixel, and the handedness of the circularly polarized light which penetrates through the circular polarizer is the same as the handedness of the circularly polarized light which penetrates through the second chiral liquid crystal pattern.
Further, the orthographic projection of the second chiral liquid crystal pattern on the display panel is at least partially overlapped with the second sub-pixel.
Further, the display also includes a pixel defining structure surrounding each of the sub-pixels, and an orthogonal projection of the second chiral liquid crystal pattern on the display panel is located within the pixel defining structure.
Further, the plurality of sub-pixels further comprise a second sub-pixel, the orthographic projection of the second chiral liquid crystal pattern on the display panel covers the first sub-pixel, and the orthographic projection of the second chiral liquid crystal pattern on the display panel is arranged at intervals from the second sub-pixel; or
The orthographic projection of the second chiral liquid crystal pattern on the display panel is positioned in the first sub-pixel.
Further, the first chiral liquid crystal pattern and the second chiral liquid crystal pattern are layered.
Further, the orthographic projection of the first chiral liquid crystal pattern on the display panel covers each sub-pixel; or
An orthographic projection of the first chiral liquid crystal pattern on the display panel is located within the first sub-pixel.
Further, the first chiral liquid crystal pattern and the second chiral liquid crystal pattern are arranged in the same layer.
Further, an orthographic projection of the first chiral liquid crystal pattern on the display panel is located within the first sub-pixel.
Further, the display module assembly still includes:
and a planarization layer covering the first chiral liquid crystal pattern, the second chiral liquid crystal pattern, and the display panel.
Further, the display panel includes:
a substrate;
the organic electroluminescent layer is arranged on one side of the substrate;
the packaging layer is arranged on one side, back to the substrate, of the organic electroluminescent layer, the first chiral liquid crystal pattern and the second chiral liquid crystal pattern are arranged between the packaging layer and the circular polarizer, and the planarization layer covers the first chiral liquid crystal pattern, the second chiral liquid crystal pattern and the packaging layer.
Further, the emergent light of the first sub-pixel is blue light, green light or red light.
Further, the emergent light of the first sub-pixel is blue light, and the light with the wavelength in the second wavelength band is yellow light.
Further, emergent light of the first sub-pixel is blue light, the first wavelength band is 420nm-480nm, and the second wavelength band is 550nm-580 nm.
Further, the first chiral liquid crystal pattern comprises cholesteric liquid crystal, and the average refractive index of the cholesteric liquid crystal is 1.2-1.8; and/or
The pitch of the cholesteric liquid crystal is 0-3 μm; and/or
The difference in refractive index of the cholesteric liquid crystal with respect to ordinary light and extraordinary light is 0-0.2.
Further, the first chiral liquid crystal pattern has a thickness of 1 μm to 3 μm.
According to one aspect of the disclosure, a display device is provided, which comprises the display module.
According to the display module and the display device, the first chiral liquid crystal pattern is supposed to be capable of reflecting left-handed circularly polarized light and transmitting right-handed circularly polarized light, the right-handed circularly polarized light in the emergent light of the first sub-pixel penetrates through the first chiral liquid crystal pattern and is emitted through the circular polarizing plate, the left-handed circularly polarized light in the emergent light of the first sub-pixel is reflected to the display panel by the first chiral liquid crystal pattern and is reflected by the metal electrode of the display panel to form right-handed circularly polarized light, and then the right-handed circularly polarized light is emitted through the first chiral liquid crystal pattern and the circular polarizing plate in sequence, so that the transmittance of the emergent light of the first sub-pixel is improved, and the power consumption is reduced; meanwhile, the light reflection structure can reflect the light with the wavelength located in the second waveband, and the light with the wavelength located in the second waveband are complementary colored light, so that the problem of hue deterioration caused by increase of the emergent light transmittance of the first sub-pixel is solved.
Drawings
Fig. 1 is a schematic view illustrating a light reflection process of an OLED display panel in the related art.
Fig. 2 is a schematic view of a display module according to an embodiment of the disclosure.
Fig. 3 is another schematic view of a display module according to an embodiment of the disclosure.
Fig. 4 is another schematic view of a display module according to an embodiment of the disclosure.
Fig. 5 is a schematic view of a light emitting process of the display module according to the embodiment of the disclosure.
Fig. 6 is a schematic view illustrating a light reflection process of the display module according to the embodiment of the disclosure.
Fig. 7 is a schematic view of a light emitting process of the display module in the third embodiment.
FIG. 8 is a schematic view of a reflection process of the display module according to the third embodiment.
Fig. 9 is a CIE1931 chromaticity diagram.
Description of reference numerals: 1. driving the back plate; 2. a sub-pixel; 201. a first sub-pixel; 202. a second sub-pixel; 203. a third sub-pixel; 3. a pixel defining structure; 4. a packaging layer; 5. a touch layer; 6. a first chiral liquid crystal pattern; 7. a second chiral liquid crystal pattern; 8. a circular polarizer; 801. a quarter-wave plate layer; 802. a linear polarizing layer; 9. a cover plate; 10. a planarization layer; 100. a display panel; 200. a light reflecting structure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this disclosure and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
In the related art, the cathode metal and the anode metal in the OLED display screen can reflect external ambient light, resulting in low contrast and outdoor visibility of the screen. Therefore, in the current OLED display, a circular polarizer 8 is generally attached to improve the above. The main functional layers of the circular polarizer 8 are a linear polarizing layer 802 and a quarter wave plate layer 801. As shown in fig. 1, the light may be divided into a first linearly polarized light and a second linearly polarized light with a vertical polarization direction, the polarization direction of the first linearly polarized light is vertical to the light absorption axis direction of the linear polarizing layer 802, and the polarization direction of the second linearly polarized light is parallel to the light absorption axis direction of the linear polarizing layer 802; first linearly polarized light in external environment light can penetrate through the linear polarization layer 802 to reach the quarter-wave plate layer 801, the first linearly polarized light is changed into circularly polarized light after passing through the quarter-wave plate layer 801, the circularly polarized light is changed in the handedness after being reflected by the display panel 100 (the refractive index of the display panel 100 is larger), the circularly polarized light with the changed handedness is changed into second linearly polarized light after penetrating through the quarter-wave plate layer 801, and the second linearly polarized light cannot penetrate through the linear polarization layer 802, so that the reflection of the display panel 100 to the environment light is reduced. However, for the emergent light of the display screen, two circularly polarized lights with opposite rotation directions in the emergent light are changed into a first linearly polarized light and a second linearly polarized light with vertical polarization directions after passing through the quarter-wave plate layer 801, and only one linearly polarized light in the first linearly polarized light and the second linearly polarized light can be emitted due to the linear polarizing layer 802, so that the light transmittance is reduced, the efficiency of the OLED display screen is reduced, and the power consumption is increased.
The disclosed embodiment provides a display module. As shown in fig. 2 to 4, the display module may include a display panel, a first chiral liquid crystal pattern 6, a circular polarizer 8, and a reflective structure 200, wherein:
the display panel includes a plurality of sub-pixels 2, and the plurality of sub-pixels 2 includes a first sub-pixel 201. The first chiral liquid crystal pattern 6 is disposed on the light emitting side of the first sub-pixel 201. The first chiral liquid crystal pattern 6 is capable of reflecting one circularly polarized light and transmitting the other circularly polarized light for two circularly polarized lights of opposite handedness and having a wavelength in the first wavelength band. The first wavelength band is located in the outgoing light wavelength band of the first subpixel 201. The circular polarizer 8 is disposed on a side of the first chiral liquid crystal pattern 6 facing away from the display panel. The handedness of the circularly polarized light transmitted by the circularly polarizer 8 is the same as that of the circularly polarized light transmitted by the first chiral liquid crystal pattern 6. The light reflecting structure 200 is disposed on the light emitting side of the display panel and is used for reflecting light with a wavelength in the second wavelength band. The light with the wavelength in the first waveband and the light with the wavelength in the second waveband are complementary color light.
In the display module of the embodiment of the disclosure, for two circularly polarized lights with opposite rotation directions and a wavelength in the first wavelength band, assuming that the first chiral liquid crystal pattern 6 can reflect left circularly polarized light and can transmit right circularly polarized light, as shown in fig. 5, the right circularly polarized light in the emergent light of the first sub-pixel 201 will pass through the first chiral liquid crystal pattern 6 and exit through the circular polarizer 8, the left circularly polarized light in the emergent light of the first sub-pixel 201 is reflected to the display panel 100 by the first chiral liquid crystal pattern 6 and forms right circularly polarized light after being reflected by the metal electrode of the display panel 100 (the refractive index of the display panel 100 is greater than that of the first chiral liquid crystal pattern 6), and then the right circularly polarized light sequentially exits through the first chiral liquid crystal pattern 6 and the circular polarizer 8, so that the transmittance of the emergent light of the first sub-pixel 201 is improved, and the power consumption is reduced; meanwhile, as shown in the X part of fig. 6, compared with the structure shown in fig. 1, due to the first chiral liquid crystal pattern 6, the reflectivity of the display module to the ambient light with the wavelength in the first wavelength band is increased, as shown in the Y part of fig. 6, the light reflecting structure 200 can reflect the light with the wavelength in the second wavelength band, and since the light with the wavelength in the first wavelength band and the light with the wavelength in the second wavelength band are complementary color lights, the problem of hue deterioration caused by the increased reflectivity of the display module to the ambient light with the wavelength in the first wavelength band is solved.
The following describes each part of the display module according to the embodiment of the present disclosure in detail:
the display panel may be an OLED display panel, but the present disclosure is not limited thereto. As shown in fig. 2, the display panel may include a driving backplane 1 and an organic electroluminescent layer. The driving backplate 1 may comprise a substrate and a driving circuit layer. The substrate may be a rigid substrate. The rigid substrate may be a glass substrate or a PMMA (Polymethyl methacrylate) substrate. Of course, the substrate may also be a flexible substrate. The flexible substrate may be a PET (Polyethylene terephthalate) substrate, a PEN (Polyethylene naphthalate) substrate, or a PI (Polyimide) substrate.
The driver circuit layer may be provided on the substrate. The driving circuit layer may include a plurality of driving transistors. The driving transistor may be a thin film transistor, but the disclosed embodiments are not limited thereto. The thin film transistor may be a top gate thin film transistor, and of course, the thin film transistor may also be a bottom gate thin film transistor. Taking the thin film transistor as a top gate thin film transistor as an example, the driving circuit layer may include an active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, a source electrode, and a drain electrode. The active layer may be disposed on the substrate. The gate insulating layer may be provided on the substrate and cover the active layer. The gate electrode may be provided on a side of the gate insulating layer remote from the substrate. The interlayer insulating layer may be disposed on the gate insulating layer and cover the gate electrode. The source and drain electrodes may be provided on the interlayer insulating layer and connected to the active layer via a via hole passing through the interlayer insulating layer and the gate insulating layer.
The organic electroluminescent layer may be disposed on a side of the driving circuit layer facing away from the substrate. As shown in fig. 2, the organic electroluminescent layer may include a plurality of pixels distributed in an array. Each pixel may include a plurality of sub-pixels 2. The display panel may further comprise a pixel defining structure 3 surrounding each sub-pixel 2, that is, two adjacent sub-pixels 2 are separated by the pixel defining structure 3. The sub-pixel 2 may include a first electrode, a light emitting material layer, and a second electrode. The first electrode may be disposed on a side of the driving circuit layer facing away from the substrate. The first electrode may be an anode, but may be a cathode. The luminescent material layer may be disposed on a side of the first electrode facing away from the substrate. The second electrode may be disposed on a side of the light emitting material layer facing away from the first electrode. Taking the first electrode as an anode for example, the second electrode can be a cathode; taking the first electrode as a cathode for example, the second electrode may be an anode. The sub-pixel 2 may further include a hole transport layer and a hole injection layer. The hole transport layer may be between the anode and the light emitting material layer, and the hole injection layer may be between the anode and the hole transport layer. The side of the second electrode facing away from the substrate may be the light exit side of the sub-pixel 2. The display panel of the present disclosure may further include an encapsulation layer 4. The encapsulation layer 4 may be provided on the side of the organic electroluminescent layer facing away from the substrate. The encapsulation layer 4 may be a thin film encapsulation layer (TFE), but the disclosure is not limited thereto. Of course, the display panel may further include a touch layer 5. The touch layer 5 may be provided on a side of the encapsulation layer 4 facing away from the substrate.
As shown in fig. 2, the plurality of sub-pixels 2 may include a first sub-pixel 201. The emergent light of the first sub-pixel 201 may be blue light, green light or red light, that is, the first sub-pixel 201 may be a blue sub-pixel 2, a green sub-pixel 2 or a red sub-pixel 2. The number of the first sub-pixels 201 may be one or more. Of course, the plurality of sub-pixels 2 may also include the second sub-pixel 202, but is not limited thereto, and may also include the third sub-pixel 203. The number of the second sub-pixels 202 may be one or more. The number of the third sub-pixels 203 may be one or more. The second sub-pixel 202 may be a blue sub-pixel 2, a green sub-pixel 2, or a red sub-pixel 2. The third sub-pixel 203 may be a blue sub-pixel 2, a green sub-pixel 2, or a red sub-pixel 2. The emergent light colors of the first sub-pixel 201, the second sub-pixel 202 and the third sub-pixel 203 are different. For example, the first sub-pixel 201 is a blue sub-pixel 2, one of the second sub-pixel 202 and the third sub-pixel 203 is a red sub-pixel 2, and the other is a green sub-pixel 2.
As shown in fig. 2, the first chiral liquid crystal pattern 6 is disposed on the light emitting side of the first sub-pixel 201. Taking the display panel 100 including the encapsulation layer 4 as an example, the first chiral liquid crystal pattern 6 may be disposed on a side of the encapsulation layer 4 opposite to the substrate. Taking the display panel 100 including the touch layer 5 as an example, the first chiral liquid crystal pattern 6 may be disposed on a side of the touch layer 5 opposite to the substrate. The first chiral liquid crystal pattern 6 may have a thickness of 1 μm to 3 μm, for example, 1 μm, 2 μm, 3 μm, or the like, in the thickness direction of the display panel 100. The first chiral liquid crystal pattern 6 may include a liquid crystal material layer and an alignment layer in a thickness direction of the display panel 100. The first chiral liquid crystal pattern 6 of the present disclosure can be directly prepared on the display panel 100, and the specific process is as follows: an alignment layer is coated on the display panel 100, and after the steps of pre-curing, main curing, alignment and drying, a liquid crystal material layer is coated on the alignment layer, and then the steps of drying a solvent at a low temperature (below 95 ℃), UV curing and the like are carried out. The material of the alignment layer can be Polyimide (PI), and the Polyimide (PI) can be solidified into a film under a low-temperature condition (below 95 ℃).
The liquid crystal material in the first chiral liquid crystal pattern 6 has optical rotation, and specifically, when the liquid crystal material in the first chiral liquid crystal pattern 6 has a dextrorotatory structure, the first chiral liquid crystal pattern 6 can transmit levorotatory circularly polarized light and reflect dextrorotatory circularly polarized light for circularly polarized light with a wavelength in a first wavelength band; when the liquid crystal material in the first chiral liquid crystal pattern 6 has a left-handed structure, the first chiral liquid crystal pattern 6 can transmit right-handed circularly polarized light and reflect left-handed circularly polarized light with respect to circularly polarized light having a wavelength in the first wavelength band. The first wavelength band is located in the wavelength band of the outgoing light of the first subpixel 201, that is, the color of the light having the wavelength located in the first wavelength band is the same as the color of the outgoing light of the first subpixel 201. Taking the emergent light of the first sub-pixel 201 as blue light as an example, the first wavelength band is 420nm to 480nm, but the disclosure does not limit this.
For example, the liquid crystal material in the first chiral liquid crystal pattern 6 may be cholesteric liquid crystal, which has optical activity, and the pitch of the cholesteric liquid crystal has a very important influence on the optical properties thereof. For the right-handed cholesteric liquid crystal with the pitch close to the wavelength of incident light, if left-handed circularly polarized light is incident, light transmission is generated, and if right-handed circularly polarized light is incident, light scattering the same as Bragg reflection is generated; for the left-handed cholesteric liquid crystal with the helical pitch close to the wavelength of incident light, if right-handed circularly polarized light is incident, light transmission is generated, and if left-handed circularly polarized light is incident, light scattering the same as Bragg reflection is generated. For cholesteric liquid crystals, the average refractive index n of the liquid crystalavg1.2-1.8, pitch P is 0-3 μm, and the difference Deltan between the refractive index of the ordinary light and the refractive index of the extraordinary light is 0-0.2. The peak wavelength λ max of the light reflected by the cholesteric liquid crystal is equal to the average refractive index n of the liquid crystalavgThe product of the pitch P, i.e. λ max ═ navgAnd the spectrum width Delta lambda of the light reflected by the cholesteric liquid crystal is equal to the product of the Delta n and the pitch P, namely Delta lambda is equal to Delta n P. Wherein, the spectrum width Delta lambda of the light reflected by the cholesteric liquid crystal is the wave band of the reflected light.
In one embodiment of the present disclosure, as shown in fig. 3 and 4, an orthographic projection of the first chiral liquid crystal pattern 6 on the display panel 100 is located within the first sub-pixel 201, that is, the orthographic projection of the first chiral liquid crystal pattern 6 on the substrate completely coincides with the orthographic projection of the first sub-pixel 201 on the substrate or the orthographic projection of the first sub-pixel 201 on the substrate surrounds the orthographic projection of the first chiral liquid crystal pattern 6 on the substrate, wherein an orthographic projection area of the first chiral liquid crystal pattern 6 on the substrate is smaller than or equal to an orthographic projection area of the first sub-pixel 201 on the substrate. Taking the number of the first sub-pixels 201 as an example, the first chiral liquid crystal pattern 6 only includes one liquid crystal cell, and the orthographic projection of the liquid crystal cell on the display panel 100 is located in the first sub-pixel 201; taking the number of the first sub-pixels 201 as an example, the first chiral liquid crystal pattern 6 includes a plurality of liquid crystal cells, the plurality of liquid crystal cells are in one-to-one correspondence with the plurality of first sub-pixels 201, and an orthogonal projection of each liquid crystal cell on the display panel 100 is located in the corresponding first sub-pixel 201.
In another embodiment of the present disclosure, as shown in fig. 2, the display panel 100 may include a display area and a frame area surrounding the display area, and the forward projection of the first chiral liquid crystal pattern 6 on the display panel 100 covers all the sub-pixels 2, that is, the display area of the display panel 100 is located in the forward projection area of the first chiral liquid crystal pattern 6 on the display panel 100. In other embodiments of the present disclosure, the orthographic projection of the first chiral liquid crystal pattern 6 on the display panel 100 covers a part of the display area of the display panel 100, which includes both the first sub-pixel 201 and the second sub-pixel 202 and/or the third sub-pixel 203.
As shown in fig. 2, the circular polarizer 8 is disposed on a side of the first chiral liquid crystal pattern 6 facing away from the display panel 100. The handedness of the circularly polarized light transmitted through the circular polarizer 8 is the same as the handedness of the circularly polarized light transmitted through the first chiral liquid crystal pattern 6, for example, the circularly polarized light transmitted through the circular polarizer 8 and the circularly polarized light transmitted through the first chiral liquid crystal pattern 6 are both left-handed circularly polarized light, and for example, the circularly polarized light transmitted through the circular polarizer 8 and the circularly polarized light transmitted through the first chiral liquid crystal pattern 6 are both right-handed circularly polarized light. The circular polarizer 8 may include a quarter wave plate layer 801 and a linear polarizing layer 802. The quarter-wave plate layer 801 may be disposed on a side of the first chiral liquid crystal pattern 6 facing away from the display panel 100, and the linear polarizer layer 802 may be disposed on a side of the quarter-wave plate layer 801 facing away from the display panel 100.
As shown in fig. 2, the light reflecting structure 200 is disposed on the light emitting side of the display panel 100 and is used for reflecting light with a wavelength in the second wavelength band. The light with the wavelength in the first waveband and the light with the wavelength in the second waveband are complementary color light. As shown in the chromaticity diagram of fig. 9, taking the light with the wavelength in the first wavelength band as blue light as an example, the light with the wavelength in the second light-emitting wavelength band may be yellow light, and the second wavelength band may be 550nm-580 nm. The light reflecting structure 200 may include a second chiral liquid crystal pattern 7. As shown in fig. 4, the second chiral liquid crystal pattern 7 and the first chiral liquid crystal pattern 6 may be provided in the same layer, but as shown in fig. 2 and 3, the second chiral liquid crystal pattern 7 and the first chiral liquid crystal pattern 6 may be provided in layers. In the second chiral liquid crystal pattern 7 and the first chiral liquid crystal pattern 6 which are layered, the second chiral liquid crystal pattern 7 may be located on a side of the first chiral liquid crystal pattern 6 facing away from the display panel 100, and the second chiral liquid crystal pattern 7 may be located on a side of the first chiral liquid crystal pattern 6 facing the display panel 100. The second chiral liquid crystal pattern 7 may be located between the circular polarizer 8 and the display panel 100. Specifically, the second chiral liquid crystal pattern 7 may be located between the quarter-wave plate layer 801 and the display panel 100. The liquid crystal material in the second chiral liquid crystal pattern 7 may be cholesteric liquid crystal.
Part of the area of the second chiral liquid crystal pattern 7 may be located in the range of the light emitted from the second sub-pixel 202 and/or the third sub-pixel 203, that is, the light emitted from the second sub-pixel 202 and/or the third sub-pixel 203 can reach the second chiral liquid crystal pattern 7, and the handedness of the circularly polarized light passing through the circular polarizer 8 is the same as the handedness of the circularly polarized light passing through the second chiral liquid crystal pattern 7, so that the light emitting efficiency of the second sub-pixel 202 and/or the third sub-pixel 203 may be prevented from being affected. In one embodiment of the present disclosure, as shown in fig. 2, the orthographic projection of the second chiral liquid crystal pattern 7 on the display panel 100 at least partially overlaps with the second sub-pixel 202 and/or the orthographic projection of the second chiral liquid crystal pattern 7 on the display panel 100 at least partially overlaps with the third sub-pixel 203, for example, the display area of the display panel 100 is located in the orthographic projection area of the second chiral liquid crystal pattern 7 on the display panel 100, and the second chiral liquid crystal pattern 7 may be layered with the first chiral liquid crystal pattern 6. In another embodiment of the present disclosure, as shown in fig. 4, the orthogonal projection of the second chiral liquid crystal pattern 7 on the display panel 100 is located in the pixel defining structure 3, and the distance between the orthogonal projection of the second chiral liquid crystal pattern 7 on the display panel 100 and the second sub-pixel 202 or the third sub-pixel 203 may be greater than 10 μm, and the second chiral liquid crystal pattern 7 may be disposed in the same layer as the first chiral liquid crystal pattern 6.
Of course, the partial region of the second chiral liquid crystal pattern 7 may be located outside the range of the light emitted from the second sub-pixel 202 and/or the third sub-pixel 203, that is, the light emitted from the second sub-pixel 202 and/or the third sub-pixel 203 cannot reach the second chiral liquid crystal pattern 7, and the handedness of the circularly polarized light transmitted through the circular polarizer 8 is the same as or different from the handedness of the circularly polarized light transmitted through the second chiral liquid crystal pattern 7. Specifically, as shown in fig. 3, the orthogonal projection of the second chiral liquid crystal pattern 7 on the display panel 100 covers the first sub-pixel 201, the orthogonal projection of the second chiral liquid crystal pattern 7 on the display panel 100 is disposed at a distance from the second sub-pixel 202 and/or the third sub-pixel 203, the orthogonal projection area of the second chiral liquid crystal pattern 7 on the substrate is larger than the orthogonal projection area of the first sub-pixel 201 on the substrate, and the second chiral liquid crystal pattern 7 may be layered with the first chiral liquid crystal pattern 6. In other embodiments of the present disclosure, the orthographic projection of the second chiral liquid crystal pattern 7 on the display panel 100 is located within the first sub-pixel 201, that is, the orthographic projection of the second chiral liquid crystal pattern 7 on the substrate completely coincides with the orthographic projection of the first sub-pixel 201 on the substrate or the orthographic projection of the first sub-pixel 201 on the substrate surrounds the orthographic projection of the second chiral liquid crystal pattern 7 on the substrate, wherein the orthographic projection area of the second chiral liquid crystal pattern 7 on the substrate is smaller than or equal to the orthographic projection area of the first sub-pixel 201 on the substrate.
As shown in fig. 3 and 4, the display module according to the embodiment of the present disclosure may further include a planarization layer 10. The planarization layer 10 may cover the first chiral liquid crystal pattern 6, the second chiral liquid crystal pattern 7, and the display panel 100. In the case where the first chiral liquid crystal pattern 6 is provided on the side of the sealing layer 4 opposite to the substrate, the planarization layer 10 may cover the first chiral liquid crystal pattern 6, the second chiral liquid crystal pattern 7, and the sealing layer 4. For example, the first chiral liquid crystal pattern 6 is disposed on a side of the touch layer 5 opposite to the substrate, and the planarization layer 10 may cover the first chiral liquid crystal pattern 6, the second chiral liquid crystal pattern 7, and the touch layer 5.
The embodiment of the disclosure also provides a display device. The display device may include the display module according to any one of the above embodiments. The display device can be a television, a mobile phone, a computer and the like. Since the display panel included in the display device of the embodiment of the present disclosure is the same as the display panel in the embodiment of the display panel, the display device has the same beneficial effects, and the details of the present disclosure are not repeated herein.
Testing
The display module includes a first sub-pixel 201, a second sub-pixel 202 and a third sub-pixel 203, wherein the first sub-pixel 201 is a blue sub-pixel 2, the second sub-pixel 202 is a green sub-pixel 2, and the third sub-pixel 203 is a red sub-pixel 2.
Scheme one
The light-emitting side of the display module is only provided with the circular polarizer 8, and the reflection process of the ambient light is as shown in fig. 1.
Scheme two
The light-emitting side of the first sub-pixel 201, the light-emitting side of the second sub-pixel 202 and the light-emitting side of the third sub-pixel 203 are all provided with chiral liquid crystal patterns, each chiral liquid crystal pattern can transmit the emergent light of the corresponding sub-pixel 2, and meanwhile, a circular polarizer 8 is further arranged.
Scheme three
The light emitting side of the first sub-pixel 201 is provided with the first chiral liquid crystal pattern 6 of the present disclosure, the light emitting side of the display module is not provided with the light reflecting structure 200 of the present disclosure, and the display module is further provided with the circular polarizer 8, the light emitting process of the display module is as shown in fig. 7, and the light reflecting process of the display module to the ambient light is as shown in fig. 8.
Scheme four
By adopting the scheme of the embodiment of the disclosure, the light-emitting side of the display module is only provided with the first chiral liquid crystal pattern 6, and the light-reflecting structure 200 can reflect yellow light.
The display module in the above four schemes is tested, and the results are shown in the following table 1:
TABLE 1
In table 1, R total represents the reflectance of the entire visible light band (380nm to 780nm), a and b represent the reflected hue, a represents red and green, b represents yellow and blue, and the reflectance increase ratio represents the ratio of the reflectance of the other recipe to the reflectance of the recipe one. As can be seen from table 1, the hue change was not much in case of case two compared to case one, but the reflectance was increased by 20%; the reflectance was reduced in case III compared to case II, but the hue b deteriorated from-1.2 to-5.4; with respect to the fourth embodiment, the degree of deterioration of hue is small and the increase in reflectance is small.
Although the present disclosure has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure.
Claims (19)
1. A display module, comprising:
a display panel including a plurality of sub-pixels including a first sub-pixel;
the first chiral liquid crystal pattern is arranged on the light outgoing side of the first sub-pixel, can reflect one circularly polarized light and can transmit the other circularly polarized light for two circularly polarized lights with opposite rotation directions and the wavelength in a first wave band, and the first wave band is positioned in the outgoing light wave band of the first sub-pixel;
the circular polarizer is arranged on one side, back to the display panel, of the first chiral liquid crystal pattern, and the handedness of circularly polarized light transmitted by the circular polarizer is the same as that of circularly polarized light transmitted by the first chiral liquid crystal pattern;
and the light reflecting structure is arranged on the light emitting side of the display panel and used for reflecting light with the wavelength positioned in the second waveband, wherein the wavelength is positioned in the light with the first waveband and the wavelength is positioned in the light with the second waveband, and the light with the second waveband is complementary colored light.
2. The display module of claim 1, wherein the light reflecting structure comprises a second chiral liquid crystal pattern.
3. The display module of claim 2, wherein the second chiral liquid crystal pattern is located between the circular polarizer and the display panel.
4. The display module according to claim 3, wherein the plurality of sub-pixels further comprises a second sub-pixel, and an exit light color of the second sub-pixel is different from an exit light color of the first sub-pixel; and part of the second chiral liquid crystal pattern is positioned in the emergent light range of the second sub-pixel, and the handedness of the circularly polarized light which penetrates through the circular polarizer is the same as the handedness of the circularly polarized light which penetrates through the second chiral liquid crystal pattern.
5. A display module according to claim 4, wherein the orthographic projection of the second chiral liquid crystal pattern on the display panel at least partially coincides with the second sub-pixel.
6. A display module according to claim 4, wherein the display further comprises a pixel defining structure surrounding each of the sub-pixels, the orthographic projection of the second chiral liquid crystal pattern on the display panel being within the pixel defining structure.
7. The display module according to claim 3, wherein the plurality of sub-pixels further comprises a second sub-pixel, the orthographic projection of the second chiral liquid crystal pattern on the display panel covers the first sub-pixel, and the orthographic projection of the second chiral liquid crystal pattern on the display panel is spaced from the second sub-pixel; or
The orthographic projection of the second chiral liquid crystal pattern on the display panel is positioned in the first sub-pixel.
8. A display module according to claim 3, 5 or 7, characterized in that the first chiral liquid crystal pattern and the second chiral liquid crystal pattern are arranged in layers.
9. The display module of claim 8, wherein an orthographic projection of the first chiral liquid crystal pattern on the display panel covers each of the sub-pixels; or
An orthographic projection of the first chiral liquid crystal pattern on the display panel is located within the first sub-pixel.
10. The display module according to claim 3 or 6, wherein the first chiral liquid crystal pattern and the second chiral liquid crystal pattern are disposed in the same layer.
11. The display module of claim 10, wherein an orthographic projection of the first chiral liquid crystal pattern on the display panel is within the first sub-pixel.
12. The display module assembly of claim 3, wherein the display module assembly further comprises:
and a planarization layer covering the first chiral liquid crystal pattern, the second chiral liquid crystal pattern, and the display panel.
13. The display module of claim 12, wherein the display panel comprises:
a substrate;
the organic electroluminescent layer is arranged on one side of the substrate;
the packaging layer is arranged on one side, back to the substrate, of the organic electroluminescent layer, the first chiral liquid crystal pattern and the second chiral liquid crystal pattern are arranged between the packaging layer and the circular polarizer, and the planarization layer covers the first chiral liquid crystal pattern, the second chiral liquid crystal pattern and the packaging layer.
14. The display module of claim 1, wherein the light emitted from the first sub-pixel is blue light, green light or red light.
15. The display module according to claim 1 or 2, wherein the light emitted from the first sub-pixel is blue light, and the light having a wavelength in the second wavelength band is yellow light.
16. The display module according to claim 1 or 2, wherein the light emitted from the first sub-pixel is blue light, the first wavelength band is 420nm to 480nm, and the second wavelength band is 550nm to 580 nm.
17. A display module according to claim 2, characterized in that the first and/or the second chiral liquid crystal pattern comprises cholesteric liquid crystal having an average refractive index of 1.2-1.8; and/or
The pitch of the cholesteric liquid crystal is 0-3 μm; and/or
The difference in refractive index of the cholesteric liquid crystal with respect to ordinary light and extraordinary light is 0-0.2.
18. A display module according to claim 2, characterized in that the first and/or the second chiral liquid crystal pattern has a thickness of 1 μm to 3 μm.
19. A display device comprising the display module according to any one of claims 1 to 18.
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