CN114967210B - Reflection display module and preparation method thereof - Google Patents
Reflection display module and preparation method thereof Download PDFInfo
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- CN114967210B CN114967210B CN202210161682.9A CN202210161682A CN114967210B CN 114967210 B CN114967210 B CN 114967210B CN 202210161682 A CN202210161682 A CN 202210161682A CN 114967210 B CN114967210 B CN 114967210B
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
Abstract
The present disclosure provides a reflective display module and a method for manufacturing the same, the display module at least comprising: a substrate; a driving functional layer disposed on one side surface of the substrate; the reflecting layer is arranged on the surface of one side of the driving functional layer far away from the substrate; the reflective layer comprises at least: the first refraction layer is arranged on the surface of one side of the driving functional layer far away from the substrate; the second refraction layer is arranged on one side surface of the first refraction layer far away from the driving functional layer, and the refractive index of the second refraction layer is larger than that of the first refraction layer; the fluorescent conversion layer is arranged on one side surface of the second refraction layer far away from the first refraction layer, the fluorescent conversion layer is provided with a plurality of light-emitting areas, and fluorescent materials used for emitting light rays of colors of pixel display areas corresponding to the light-emitting areas are arranged in each light-emitting area. The reflection display module has higher color gamut and achieves the purpose of color display by utilizing the two refraction layers with different refractive indexes to realize conversion and reflection between ambient light and color light in cooperation with fluorescent materials.
Description
Technical Field
The disclosure relates to the technical field of reflective display, and in particular relates to a reflective display module and a preparation method thereof.
Background
In recent years, reflective display products have wider application scenes, such as E-ink, electronic paper, conventional reflective display devices prepared by using high metal reflectivity, and the like, but the current reflective display products can only display black, white and gray with different gray scales, cannot perform color display, and meanwhile, the dependence of display brightness on visual angles is very large, so that the use experience of users is affected.
Disclosure of Invention
An object of an embodiment of the present disclosure is to provide a reflective display module and a method for manufacturing the same, which are used for solving the problem that a reflective display product in the prior art cannot perform color display, and the dependence of display brightness on viewing angle is large.
The embodiment of the disclosure adopts the following technical scheme: a reflective display module, comprising: a substrate; a driving functional layer disposed on one side surface of the substrate; the reflecting layer is arranged on the surface of one side of the driving functional layer, which is far away from the substrate; wherein the reflecting layer comprises at least: the first refraction layer is arranged on the surface of one side of the driving functional layer, which is far away from the substrate; the second refraction layer is arranged on one side surface of the first refraction layer far away from the driving functional layer, and the refractive index of the second refraction layer is larger than that of the first refraction layer; the fluorescent conversion layer is arranged on one side surface of the second refraction layer, far away from the first refraction layer, the fluorescent conversion layer is provided with a plurality of luminous areas, each luminous area corresponds to one pixel display area, and fluorescent materials used for emitting light rays of colors of the pixel display areas corresponding to the luminous areas are arranged in each luminous area.
In some embodiments, a surface of the first refraction layer far away from one side of the driving functional layer is provided with a plurality of uniformly distributed concave structures, and all concave structures have the same concave degree; the second refraction layer is arranged in the concave structure and covers the surface of one side of the concave structure away from the driving functional layer; the recessed structures are filled with the fluorescent material to form the fluorescent conversion layer.
In some embodiments, a surface of the second refractive layer adjacent to the fluorescent conversion layer is roughened.
In some embodiments, further comprising: and a surface roughening film layer disposed between the second refractive layer and the fluorescent conversion layer, the surface roughening film layer and the second refractive layer being made of the same material, and a surface of one side of the surface roughening film layer, which is close to the fluorescent conversion layer, being roughened.
In some embodiments, the color of the pixel display area includes at least red, green, and blue; the fluorescent material filled in the concave structure corresponding to the green pixel display area is a first fluorescent material, and the first fluorescent material emits green light after absorbing ambient light; the fluorescent material filled in the concave structure corresponding to the red pixel display area is a second fluorescent material, and the second fluorescent material emits red light after absorbing ambient light; and the concave structures corresponding to the blue pixel display areas are not filled with fluorescent materials.
In some embodiments, the recessed structures corresponding to the blue pixel display areas are filled with scattering particle material.
In some embodiments, further comprising: a planar layer disposed between the driving function layer and the first refractive layer.
In some embodiments, further comprising: and the protective layer and the pixel electrode layer are arranged on the surface of one side of the fluorescence conversion layer, which is far away from the second refraction layer.
In some embodiments, further comprising: the color shading cover plate is arranged opposite to the pixel electrode layer, and liquid crystal is filled between the color shading cover plate and the pixel electrode layer.
The embodiment of the disclosure also provides a method for preparing the reflective display module, which comprises the following steps: manufacturing a driving functional layer on one side of a substrate; manufacturing a first refraction layer on the surface of one side of the driving functional layer far away from the substrate; manufacturing a second refraction layer on the surface of one side of the first refraction layer far away from the driving function layer, wherein the refractive index of the second refraction layer is larger than that of the first refraction layer; and manufacturing a fluorescence conversion layer on the surface of one side of the second refraction layer, which is far away from the first refraction layer, wherein the fluorescence conversion layer is provided with a plurality of light-emitting areas, each light-emitting area corresponds to one pixel display area, and fluorescent materials used for emitting light rays of colors of the pixel display areas corresponding to the light-emitting areas are arranged in each light-emitting area.
In some embodiments, after the first refraction layer is formed on the surface of the side, away from the substrate, of the driving functional layer, the method further includes: forming a plurality of uniformly distributed concave structures on the surface of the first refraction layer through nano imprinting; and manufacturing the second refraction layer and the fluorescence conversion layer in the concave structure.
In some embodiments, fabricating the second refractive layer within the recessed structures comprises: fabricating the second refractive layer within the recessed structure by vapor deposition; and roughening the surface of one side of the second refraction layer away from the first refraction layer in a dry etching mode.
In some embodiments, after the fluorescent conversion layer is formed on a surface of the second refraction layer away from the first refraction layer, the fluorescent conversion layer further comprises: and manufacturing a protective layer and a pixel electrode layer on the surface of one side of the fluorescence conversion layer, which is far away from the second refraction layer.
The beneficial effects of the embodiment of the disclosure are that: the two refraction layers with different refractive indexes are matched with fluorescent materials to realize conversion and reflection between ambient light and colored light, so that the reflective display module has higher color gamut, the purpose of color display is achieved, the light emitting angle of the colored light is wider by utilizing the luminous effect of the fluorescent materials and the like natural light, and the problem of dependence of brightness on a viewing angle is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of a hierarchical structure of a reflective display module according to a first embodiment of the disclosure;
FIG. 2 is an absorption spectrum of a first fluorescent material under natural light according to a first embodiment of the present disclosure;
FIG. 3 is an absorption spectrum of a second fluorescent material under natural light in a first embodiment of the present disclosure;
FIG. 4 is a graph showing the intensity contrast of the center wavelength between the red light emitted from the fluorescent material and the red light in the natural light according to the first embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another hierarchical structure of a reflective display module according to a first embodiment of the disclosure;
FIG. 6 is a flowchart of a method for manufacturing a reflective display module according to a second embodiment of the disclosure;
fig. 7 is a schematic diagram of another hierarchical structure of a reflective display module according to a second embodiment of the disclosure.
Detailed Description
Various aspects and features of the disclosure are described herein with reference to the drawings.
It should be understood that various modifications may be made to the embodiments of the application herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Other modifications within the scope and spirit of this disclosure will occur to persons of ordinary skill in the art.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.
These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the accompanying drawings.
It is also to be understood that, although the disclosure has been described with reference to some specific examples, a person skilled in the art will certainly be able to achieve many other equivalent forms of the disclosure, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present disclosure will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the disclosure in unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
The specification may use the word "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.
The reflection display type products have wider application fields in recent years, and the main realization principle is that the light transmission mode of the original liquid crystal display equipment is changed from transmission mode to reflection mode, the ambient light is fully utilized as a light source of the liquid crystal display module, and the content display is realized in a reflection mode, such as E-ink, electronic paper, a conventional reflection display device prepared by utilizing high metal reflectivity, and the like. However, the current reflective display products can only display black, white and gray with different gray scales, and cannot perform color display, and meanwhile, the dependence of the display brightness on the viewing angle is very large, so that the use experience of users is affected.
The conventional reflective display device generally has a bump structure (generally semicircular bump) formed on an Array substrate, and a reflective metal layer is formed on the bump structure to achieve the effects of light reflection and uniform light emission, but the bump structure is generally formed by a photolithography process in combination with a thermal reflow process, so that the requirements on materials and processes are very high, and extremely short waiting time needs to be controlled, and the manufacturing process directly influences the display effect and viewing angle characteristics of the display device.
In order to solve the above-mentioned problems, a first embodiment of the present disclosure provides a reflective display module, which uses two refractive layers with different refractive indexes to match with fluorescent materials to realize conversion and reflection between ambient light and color light, so that the reflective display module has a higher color gamut, achieves the purpose of color display, and uses the luminous effect of fluorescent materials to make the emergent angle of color light wider, and reduces the problem of dependence of brightness on viewing angle.
Fig. 1 is a schematic diagram showing a hierarchical structure of a reflective display module according to the present embodiment. As shown in fig. 1, the reflective display module mainly includes a substrate 10, a driving function layer 20, and a reflective layer 30, i.e., a module structure corresponding to one side of a TFT back plate in the liquid crystal display module, the reflective display module should further include one side of a color light shielding cover plate having a color filter film (CF), and a liquid crystal layer (not shown in fig. 1) is filled between the TFT back plate and the CF cover plate. Specifically, the substrate 10 may be a glass substrate or other rigid substrate with the same function, and the substrate 10 may be made of an opaque material because the reflective display module does not need to realize light transmission of the backlight. A driving functional layer 20 is disposed on a surface of one side of the substrate 10, for implementing fabrication and functions of TFT related layers, and mainly includes buffer layer buffer, active layer GI, gate insulating layer PLN, gate layer gate, interlayer insulating layer ILD, active metal layer ITO, etc., which can be fabricated based on fabrication processes of TFT related layers in the prior art, and this embodiment will not be described in detail. It should be noted that not all the hierarchical structures in the driving function layer 20, such as gate layer gate, active metal layer and the like,
a reflective layer 30 is disposed on a surface of the driving functional layer 20 away from the substrate 10 (i.e. an upper surface of the driving functional layer 20 in fig. 1) to reflect ambient light, so that the display module can display content. Specifically, the reflective layer 30 mainly includes a first refractive layer 31 disposed on a side surface of the driving function layer 20 away from the substrate 10, a second refractive layer 32 disposed on a side surface of the first refractive layer 31 away from the driving function layer 20, and a fluorescence conversion layer 33 disposed on a side surface of the second refractive layer 32 away from the first refractive layer 31.
Wherein the refractive index of the second refractive layer 32 is larger than that of the first refractive layer 31, so that light is totally reflected when being injected into the medium with low refractive index from the medium with high refractive index, i.e. light is injected into the first refractive layer 31 from the second refractive layer 32 and totally reflected at the interface surface of the first refractive layer and the second refractive layer, so that the reflected light is reflected from the second refractive layerThe second refractive layer 32 re-enters the fluorescent conversion layer 33. In some embodiments, the refractive index of the first refractive layer 31 may be generally set to about 1.5, and the first refractive layer 31 may be made of a resin material having a corresponding refractive index; the refractive index of the second refractive layer 32 is about 1.8, and aluminum oxide (Al 2 O 3 ) Or silicon nitride (SiN) or the like, or other materials having light transmittance properties corresponding to the refractive index may be selected for the second refractive layer 32, and the present embodiment is not limited.
The fluorescent conversion layer 33 is mainly used for absorbing high-energy short waves in incident ambient light (typically white light) and emitting low-energy long waves, typically blue light, and emitting green light or red light. The existing commonly used fluorescent materials can cover natural light of 380nm to 780nm, fig. 2 and 3 show absorption spectrums of the two fluorescent materials under the natural light, wherein solid lines in fig. 2 and 3 are white light spectrums, dotted lines represent spectrums of emergent light of the fluorescent materials, it can be seen that the first fluorescent material shown in fig. 2 mainly absorbs waves of 380nm to 500nm, the emergent light is green light, the second fluorescent material shown in fig. 3 mainly absorbs waves of 400nm to 600nm, the emergent light is red light, absorption intensity of the two fluorescent materials is high, and good conversion rate can be achieved on the environment natural light. In addition, when the white LED backlight source is used, the fluorescent material has good conversion effect when in color light display, fig. 4 shows the intensity contrast condition of the central wavelength between the red light emitted by the fluorescent material and the red light in the natural light, wherein the dotted line is the reference central wavelength intensity of the red light in the field, the solid line is the central wavelength intensity of the light emitted by the fluorescent material, and based on the knowledge shown in fig. 4, no obvious change occurs between the color of the light emitted by the fluorescent material and the color effect of the corresponding color light in the natural light, namely no obvious change in the color depth occurs, so that the color of the reflective display module is ensured to be closer to reality, and the display effect of the display module is improved.
In practical implementation, the fluorescent conversion layer 33 may be divided into a plurality of light emitting areas, where each light emitting area corresponds to one pixel display area, each pixel display area may correspond to one pixel of the display panel or several adjacent pixels, and specifically may be set according to a requirement of a display effect, and fluorescent materials for emitting light to be displayed in the corresponding pixel display area are set in each light emitting area, so as to implement that different colors are displayed in different pixel display areas. It should be noted that, in the present embodiment, the fluorescent material can emit red light and green light at present, but for blue light, the fluorescent material cannot emit blue light based on natural light conversion, so that the fluorescent material may not be disposed in the light emitting region of the fluorescent conversion layer 33 corresponding to the pixel display region for displaying blue, and blue display may be realized by the blue filter and the total reflection effect, and other manners capable of displaying blue light may be used. In addition, the design of the pixel display area is generally performed according to the arrangement manner of R (Red), G (Green), and B (Blue), and may be also performed according to the arrangement manner of RGBW (White) in practical use, at this time, the fluorescent material is not disposed in the light emitting area of the fluorescent conversion layer 33 corresponding to the White pixel display area, so that the total reflection is directly performed after the ambient light is incident, thereby improving the reflectivity of the reflective display module and achieving a better display effect.
In some embodiments, as shown in fig. 5, the surface of the first refraction layer 31 on the side close to the driving functional layer 20 is a plane, and the surface on the side far from the driving functional layer 20 is provided with a plurality of uniformly distributed concave structures 311, and all concave structures 311 have the same concave degree. Correspondingly, the second refraction layer 32 is disposed on the surface of the side of the concave structure 311 away from the driving function layer 20, which is equivalent to making at the bottom of the concave structure, and then filling the concave structure 311 with fluorescent material to form the fluorescent conversion layer 33, so as to reflect and convert light. It should be noted that, the cross-sectional shape of the concave structure shown in fig. 5 is a shape similar to a concave lens, a good reflection effect of light is achieved through the bottom surface with radian, and the visual angle of the display module is improved, and when the display module is actually manufactured, the concave structure 311 can be made to have other shapes, so long as the same function can be achieved correspondingly.
Further, when filling the fluorescent material in the concave structure 311, filling a first fluorescent material in the concave structure 311 corresponding to the green pixel display area, the first fluorescent material emitting green light after absorbing the ambient light; filling a second fluorescent material in the concave structure 311 corresponding to the red pixel display region, the second fluorescent material emitting red light after absorbing ambient light; the concave structure 311 corresponding to the blue pixel display region is not filled with the fluorescent material, and blue light is generated mainly by the color light sheet. It should be noted that the red and green light generated by the fluorescent material has a larger viewing angle, and the same display effect as that of the fluorescent material may not be achieved by using the color filter, so that the concave structure 311 corresponding to the blue pixel display area may be filled with a scattering particle material, for example, titanium dioxide (TiO 2 ) The transparent resin material of the material can further improve the visual angle of blue light, and the finally displayed picture effect can reach white balance. If the pixel display region includes white, the concave structure 311 corresponding to the white display pixel region is not filled with any material, and only the first refractive layer 31 and the second refractive layer 32 may be used to perform total reflection of light.
In some embodiments, the surface of the second refraction layer 31 near the fluorescent conversion layer 33 may be roughened, so as to improve randomness of light reflection, further increase conversion efficiency of the fluorescent material, and achieve better light emitting effect. When the second refraction layer 32 is actually fabricated, it may not be able to directly perform the roughening treatment on the surface due to the thinner layer thickness, and at this time, a surface roughening treatment layer (not shown in the drawing) may be independently disposed on the surface of the second refraction layer 31 near the fluorescent conversion layer 33, where the surface roughening treatment layer and the second refraction layer 32 are made of the same material, and the surface of the surface roughening treatment layer near the fluorescent conversion layer 33 is roughened, so as to improve the randomness of the light during reflection, further increase the conversion efficiency of the fluorescent material, and achieve a better light emitting effect.
In some embodiments, as shown in fig. 5, a planarization layer 40 is further disposed between the driving functional layer 20 and the first refraction layer 31, and may be made of a material with high planarization, such as SOG material, to reduce the surface level difference of the driving functional layer 20, so as to facilitate the subsequent manufacture of the first refraction layer 31, and reduce the problem of reflectivity reduction caused by poor planarization.
Further, the schematic diagram of the reflective display module shown in fig. 5 further includes a protection layer 51 and a pixel electrode layer 52 disposed on a side of the fluorescent conversion layer 33 away from the second refraction layer 32, wherein the electrode layer 52 is connected to the active layer in the driving functional layer 20 through a via. In addition, a color light shielding cover plate side (not shown) provided with a color filter should be provided corresponding to the structure shown in fig. 5, and liquid crystal is filled between the color light shielding cover plate and the pixel electrode layer to form a liquid crystal display module for realizing display based on reflection of ambient light. When the color shading cover plate in the embodiment is designed and implemented, the positions corresponding to the red and green pixel display areas can be displayed by fluorescent materials without setting color filters, and other structures can be the same as the settings of the color shading cover plate in the prior art, so that detailed description of the embodiment is omitted.
According to the embodiment, the two refraction layers with different refractive indexes are matched with fluorescent materials to realize conversion and reflection between ambient light and color light, so that the reflective display module has a higher color gamut, the purpose of color display is achieved, the light emitting effect of fluorescent materials is utilized, the light emitting angle of color light is wider, and the problem that the brightness depends on a viewing angle is solved.
The second embodiment of the present disclosure provides a method for manufacturing a reflective display module provided in the first embodiment, where a flowchart of the method is shown in fig. 6, and the method mainly includes steps S10 to S40:
s10, manufacturing a driving functional layer on one side of a substrate; the specific level of the driving functional layer has been described in the first embodiment, and the preparation method thereof may directly use a related preparation method in the prior art, which is not described herein in detail;
s20, manufacturing a first refraction layer on the surface of one side of the driving functional layer, which is far away from the substrate; the first refraction layer can be made of resin material with refractive index of about 1.5;
s30, manufacturing a second refraction layer on the surface of one side of the first refraction layer far away from the driving function layer, wherein the refraction index of the second refraction layer is larger than that of the first refraction layer; the second refractive layer can be made by PECVD, and the material can be Al with refractive index of about 1.8 2 O 3 Or SiN, etc.;
s40, manufacturing a fluorescence conversion layer on the surface of one side, far away from the first refraction layer, of the second refraction layer, wherein the fluorescence conversion layer is provided with a plurality of light-emitting areas, each light-emitting area corresponds to one pixel display area, and fluorescent materials used for emitting light rays of colors of the pixel display areas corresponding to the light-emitting areas are arranged in each light-emitting area.
In some embodiments, a flat layer may be formed on the driving functional layer after the driving functional layer is prepared, so that the subsequent reflective layer can be conveniently prepared, and a SOG material with high flatness can be selected, and the flatness can reach about 30-80nm at a thickness of 5 μm.
In some embodiments, after the first refraction layer is manufactured, a surface with concave structures uniformly distributed on the surface is formed through nano imprinting, the depth-to-width ratio is between 1:15 and 1:1.1, and the second refraction layer and the fluorescent material are respectively prepared in the concave structures.
In some embodiments, after the second refractive layer is prepared, a rough surface can be formed inside the second refractive layer by dry etching, so that uniformity of reflected light and fluorescence conversion rate are increased.
In some embodiments, the protective layer and the pixel electrode layer are continuously prepared on the fluorescent conversion layer. Specifically, the protective layer may include an etching barrier layer buffer, a planarization layer, a metal wire grid layer, etc., and the preparation method thereof may directly use the prior art, which is not limited in this embodiment. When the pixel electrode layer is manufactured, a via hole needs to be manufactured, and when the via hole is manufactured, the via hole needs to be included to avoid the position of the concave structure.
Afterwards, CF cover plate fabrication, mainly including OC, com electrodes, PS layers, etc., may be performed, and finally filling the cell and liquid crystal, forming a reflective display module structure as shown in fig. 5.
In actual fabrication, the fabrication of the pixel electrode layer may be preferentially performed after the fabrication of the driving functional layer, and then the reflective layer is fabricated above the pixel electrode, as shown in fig. 7, so that the path of the reflected light may be shortened, the light efficiency may be improved, the thickness of deep hole etching may be reduced, and the positional relationship between the via hole arrangement and the concave structure may not be considered, thereby simplifying the fabrication process.
According to the embodiment, the two refraction layers with different refractive indexes are matched with fluorescent materials to realize conversion and reflection between ambient light and color light, so that the reflective display module has a higher color gamut, the purpose of color display is achieved, the light emitting effect of fluorescent materials is utilized, the light emitting angle of color light is wider, and the problem that the brightness depends on a viewing angle is solved.
While various embodiments of the present disclosure have been described in detail, the present disclosure is not limited to these specific embodiments, and various modifications and embodiments can be made by those skilled in the art on the basis of the concepts of the present disclosure, and these modifications and modifications should be within the scope of the present disclosure as claimed.
Claims (12)
1. A reflective display module, comprising:
a substrate;
a driving functional layer disposed on one side surface of the substrate;
the reflecting layer is arranged on the surface of one side of the driving functional layer, which is far away from the substrate;
wherein the reflecting layer comprises at least:
the first refraction layer is arranged on the surface of one side of the driving functional layer, which is far away from the substrate;
the second refraction layer is arranged on one side surface of the first refraction layer far away from the driving functional layer, and the refractive index of the second refraction layer is larger than that of the first refraction layer;
the fluorescent conversion layer is arranged on one side surface of the second refraction layer, far from the first refraction layer, and is provided with a plurality of light-emitting areas, each light-emitting area corresponds to one pixel display area, and fluorescent materials used for emitting light rays of colors of the pixel display areas corresponding to the light-emitting areas are arranged in each light-emitting area;
the surface of the first refraction layer, which is far away from one side of the driving functional layer, is provided with a plurality of concave structures which are uniformly distributed, and the concave degrees of all the concave structures are the same;
the second refraction layer is arranged in the concave structure and covers the surface of one side of the concave structure away from the driving functional layer;
the recessed structures are filled with the fluorescent material to form the fluorescent conversion layer.
2. The reflective display module of claim 1, wherein a surface of the second refractive layer adjacent to the fluorescent conversion layer is roughened.
3. The reflective display module of claim 1, further comprising:
and a surface roughening film layer disposed between the second refractive layer and the fluorescent conversion layer, the surface roughening film layer and the second refractive layer being made of the same material, and a surface of one side of the surface roughening film layer, which is close to the fluorescent conversion layer, being roughened.
4. The reflective display module of claim 1, wherein the color of the pixel display area comprises at least red, green, and blue;
the fluorescent material filled in the concave structure corresponding to the green pixel display area is a first fluorescent material, and the first fluorescent material emits green light after absorbing ambient light;
the fluorescent material filled in the concave structure corresponding to the red pixel display area is a second fluorescent material, and the second fluorescent material emits red light after absorbing ambient light;
and the concave structures corresponding to the blue pixel display areas are not filled with fluorescent materials.
5. The reflective display module of claim 4, wherein said recessed structures corresponding to blue pixel display areas are filled with a scattering particle material.
6. The reflective display module of claim 1, further comprising:
a planar layer disposed between the driving function layer and the first refractive layer.
7. The reflective display module of any one of claims 1 to 6, further comprising:
and the protective layer and the pixel electrode layer are arranged on the surface of one side of the fluorescence conversion layer, which is far away from the second refraction layer.
8. The reflective display module of any one of claims 7, further comprising:
the color shading cover plate is arranged opposite to the pixel electrode layer, and liquid crystal is filled between the color shading cover plate and the pixel electrode layer.
9. A method of manufacturing a reflective display module according to any one of claims 1 to 8, comprising:
manufacturing a driving functional layer on one side of a substrate;
manufacturing a first refraction layer on the surface of one side of the driving functional layer far away from the substrate;
manufacturing a second refraction layer on the surface of one side of the first refraction layer far away from the driving function layer, wherein the refractive index of the second refraction layer is larger than that of the first refraction layer;
and manufacturing a fluorescence conversion layer on the surface of one side of the second refraction layer, which is far away from the first refraction layer, wherein the fluorescence conversion layer is provided with a plurality of light-emitting areas, each light-emitting area corresponds to one pixel display area, and fluorescent materials used for emitting light rays of colors of the pixel display areas corresponding to the light-emitting areas are arranged in each light-emitting area.
10. The method of manufacturing according to claim 9, further comprising, after the first refractive layer is formed on a surface of the driving functional layer on a side away from the substrate:
forming a plurality of uniformly distributed concave structures on the surface of the first refraction layer through nano imprinting;
and manufacturing the second refraction layer and the fluorescence conversion layer in the concave structure.
11. The method of manufacturing according to claim 10, wherein fabricating the second refractive layer within the recessed structures comprises:
fabricating the second refractive layer within the recessed structure by vapor deposition;
and roughening the surface of one side of the second refraction layer away from the first refraction layer in a dry etching mode.
12. The method according to any one of claims 9 to 11, characterized by further comprising, after the fluorescent conversion layer is formed on a surface of the second refractive layer on a side away from the first refractive layer:
and manufacturing a protective layer and a pixel electrode layer on the surface of one side of the fluorescence conversion layer, which is far away from the second refraction layer.
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