CN119535836A - Front light module, reflective display device and method for manufacturing front light module - Google Patents
Front light module, reflective display device and method for manufacturing front light module Download PDFInfo
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- CN119535836A CN119535836A CN202311084743.7A CN202311084743A CN119535836A CN 119535836 A CN119535836 A CN 119535836A CN 202311084743 A CN202311084743 A CN 202311084743A CN 119535836 A CN119535836 A CN 119535836A
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
本发明公开了一种前光模组、反射式显示装置以及前光模组的制造方法，其中前光模组包括导光板、发光件与偏光材料层。发光件邻近设置在导光板的入光面，发光件所产生的光线由入光面射入导光板，偏光材料层设置在导光板上并直接接触导光板的第一表面，其中第一表面不平行于入光面。
The present invention discloses a front light module, a reflective display device and a method for manufacturing the front light module, wherein the front light module comprises a light guide plate, a light emitting element and a polarizing material layer. The light emitting element is arranged adjacent to the light incident surface of the light guide plate, and the light generated by the light emitting element enters the light guide plate from the light incident surface. The polarizing material layer is arranged on the light guide plate and directly contacts the first surface of the light guide plate, wherein the first surface is not parallel to the light incident surface.
Description
Technical Field
The present invention relates to a front light module, a reflective display device and a method for manufacturing the front light module, and more particularly, to a front light module with reduced number of film layers and a method for manufacturing the front light module, and a reflective display device including the front light module.
Background
The electronic device is an indispensable product nowadays, and the display device with the display function has the characteristics of light and thin profile, low power consumption, no radiation pollution, etc., so that the electronic device is widely applied to various electronic products such as notebook computers (notebook), smart phones (smart phones), wearable devices, smart watches, and automotive displays, etc., to provide more convenient information transmission and display. In a display device, the design of the light guide plate and the polarizing structure can highly affect the display quality, thickness and cost of the display device. Accordingly, the industry is directed to properly adjusting and designing the light guide plate and the polarizing structure to improve the display device.
Disclosure of Invention
The present invention is directed to a front light module, which reduces the number of film layers of the front light module by designing the light guide plate and the polarizing material layer, and a method for manufacturing the front light module. In addition, the invention also provides a reflective display device comprising the front light module.
In order to solve the above technical problems, the present invention provides a front light module, which includes a light guide plate, a light emitting element and a polarizing material layer. The light emitting piece is arranged adjacent to the light incident surface of the light guide plate, light generated by the light emitting piece is emitted into the light guide plate from the light incident surface, and the polarizing material layer is arranged on the light guide plate and directly contacts with the first surface of the light guide plate, wherein the first surface is not parallel to the light incident surface.
In order to solve the technical problems, the invention also provides a reflective display device which comprises a substrate, the front light module, a display medium layer and a light reflecting layer. The front light module is arranged opposite to the substrate, the display medium layer is arranged between the substrate and the front light module, the light reflection layer is arranged between the substrate and the display medium layer, and the polarizing material layer of the front light module is arranged between the display medium layer and the light guide plate of the front light module.
The invention also provides a manufacturing method of the front light module, which comprises the steps of providing a light guide plate, forming a polarized light material layer on the light guide plate, wherein the polarized light material layer directly contacts with the first surface of the light guide plate, and arranging the luminous element adjacent to the light incident surface of the light guide plate. The first surface is not parallel to the light incident surface.
Drawings
Fig. 1 is a schematic cross-sectional view of a front light module according to an embodiment of the invention.
Fig. 2 is a schematic cross-sectional view of a reflective display device according to an embodiment of the invention.
Fig. 3 is a schematic diagram illustrating a method for manufacturing a front light module according to an embodiment of the invention.
The reference numerals illustrate 100-front light module, 110-light guide plate, 110 a-first surface, 110 b-second surface, 110 e-light incident surface, 120-light emitting element, 130-polarizing material layer, 130 m-polarizing material, 140-light shielding layer, 150-color conversion layer, 152-conversion part, 152 a-red conversion part, 152 b-green conversion part, 152 c-blue conversion part, 200-reflective display device, 210-substrate, 220-circuit element layer, 222-circuit unit, 224-light reflection layer, 230-display medium layer, NE-nozzle, SP-subpixel, SP 1-red subpixel, SP 2-green subpixel, SP 3-blue subpixel, X, Y, Z-direction.
Detailed Description
The following description sets forth the preferred embodiments of the invention and, together with the drawings, provides a further understanding of the invention, as well as the details of its structure and its intended use. It should be noted that the drawings are simplified schematic diagrams, and thus only show elements and combinations related to the present invention, so as to provide a clearer description of the basic architecture or implementation of the present invention, and actual elements and arrangements may be more complex. In addition, for convenience of description, elements shown in the drawings of the present invention are not drawn to scale in terms of the number, shape, size, etc. of practical implementations, and the detailed proportion thereof may be adjusted according to the design requirements.
In the description and claims of the present invention, the words "comprising," including, "" having, "and the like are words of openness and are therefore to be construed as" including but not limited to. Thus, when the terms "comprises," "comprising," and/or "having" are used in the description of the present invention, they specify the presence of the corresponding features, regions, steps, operations, and/or components, but do not exclude the presence of one or more corresponding features, regions, steps, operations, and/or components.
In the description and claims of the present invention, when "A1 member is formed from B1" it is intended that B1 is present or B1 is used in the formation of A1 member, and that the formation of A1 member does not preclude the presence or use of one or more other features, regions, steps, operations and/or members.
In the present description and claims, the term "horizontal direction" means a direction parallel to a horizontal plane, the term "horizontal plane" means a surface parallel to a direction X and a direction Y in the drawing, the term "vertical direction" means a direction parallel to a direction Z in the drawing, and the directions X, Y and Z are perpendicular to each other (i.e., the horizontal direction is perpendicular to the direction Z). In the description and claims, the term "in top view" means viewing results along a vertical direction. In the description and in the claims, the term "section" refers to the viewing result of a structure cut along the vertical direction and viewed from the horizontal direction.
In the present description and claims, the term "overlapping" means overlapping of two members in the direction Z, and, unless specified otherwise, the term "overlapping" includes partially overlapping or completely overlapping, where two members may be in direct contact with each other or a spacer may be present between the two members.
In the present description and claims, the term "approximately" is generally interpreted to be within plus or minus 10% of a given value, or to be within plus or minus 5%, plus or minus 3%, plus or minus 2%, plus or minus 1%, or plus or minus 0.5% of a given value.
The use of ordinal numbers such as "first," "second," and the like in the description and in the claims is used for modifying an element, and is not by itself intended to exclude the presence of any preceding ordinal number, nor does it represent the order in which a certain element is ordered from another element, or the order in which it is manufactured, and the use of such ordinal numbers merely serves to distinguish one element having a certain name from another element having a same name. The same words may not be used in the claims and the specification, whereby a first element in the description may be a second element in the claims.
It is to be understood that the following exemplary embodiments may be substituted, rearranged, and mixed for the features of several different embodiments without departing from the spirit of the invention to accomplish other embodiments. Features of the embodiments can be mixed and matched at will without departing from the spirit of the invention or conflicting.
Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a front light module according to an embodiment of the invention. As shown in fig. 1, the front light module 100 includes a light guide plate 110 for adjusting the incident light to control the direction of the light emitted from the light guide plate 110, so as to achieve the light guiding effect. In the present invention, the light guide plate 110 may include a material with high light transmittance according to the requirements. For example, the material of the light guide plate 110 may include Polyimide (PI), polycarbonate (polycarbonate, PC), polymethyl methacrylate (poly (methyl methacrylate), PMMA), cyclic olefin polymer (Cyclo olefin polymer, COP), other suitable materials, or a combination thereof.
As shown in fig. 1, the light guide plate 110 may include a first surface 110a, a second surface 110b, and a light incident surface 110e (or referred to as a side surface), wherein the first surface 110a and the second surface 110b are opposite to each other, and the first surface 110a is not parallel to the light incident surface 110e. In fig. 1, the light incident surface 110e is connected between the first surface 110a and the second surface 110b (e.g., the light incident surface 110e is directly connected between the first surface 110a and the second surface 110 b). For example, in fig. 1, the light guide plate 110 may be disposed substantially parallel to a horizontal plane (i.e. parallel to the direction X and the direction Y), and the light incident surface 110e of the light guide plate 110 may be substantially perpendicular to the direction X, but is not limited thereto. For example, in fig. 1, the first surface 110a is a lower surface of the light guide plate 110, and the second surface 110b is an upper surface of the light guide plate 110 facing the user.
In the present invention, the light guiding manner of the light guiding plate 110 can be designed according to the requirements. For example, the light guide plate 110 may include a plurality of light guide structures (e.g., dots), wherein the light guide structures may be convex light guide structures or concave light guide structures, such that the first surface 110a and/or the second surface 110b of the light guide plate 110 are concave-convex surfaces, but not limited thereto.
In fig. 1, the front light module 100 includes a light emitting element 120 disposed adjacent to a light incident surface 110e of the light guide plate 110. In the present invention, the light emitting member 120 may be any suitable light emitting member 120. For example, the light emitting element 120 may be a light emitting diode (LIGHT EMITTING diode, LED), but is not limited thereto. In the present invention, the light generated by the light emitting member 120 may have any suitable color. For example, the light emitting element 120 may generate white light, blue light or other suitable color light.
In the present invention, the light generated by the light emitting element 120 can be emitted into the light guide plate 110 through the light incident surface 110e, so that the light guide plate 110 can adjust the light generated by the light emitting element 120 to achieve the light guiding effect. The light incident into the light guide plate 110 may be reflected and/or refracted due to the design of the light guide plate 110, so as to achieve a proper light guiding effect. For example, the first surface 110a and the second surface 110b of the light guide plate 110 may reflect and refract the light incident into the light guide plate 110, but not limited thereto. In fig. 1, when the light guide plate 110 is applied to a front light module in a reflective display device, a portion of light incident into the light guide plate 110 is emitted from the first surface 110a to the light guide plate 110, reflected by a light reflecting layer of the reflective display device, and then is emitted from the second surface 110b to the light guide plate 110 again.
In fig. 1, the front light module 100 includes a polarizing material layer 130 disposed on the light guide plate 110 and directly contacting the first surface 110a of the light guide plate 110, wherein the polarizing material layer 130 has a single-layer structure, and the polarizing material layer 130 has a polarizing axis, such that light passes through the polarizing material layer 130 to form polarized light. In other words, the polarizing material layer 130 of a single layer structure may be directly formed on the light guide plate 110 to directly contact the light guide plate 110, such that there is no intermediate layer (e.g., a polarizing structure protective layer, an adhesive layer, etc.) between the polarizing material layer 130 and the light guide plate 110.
The polarizing material layer 130 includes a lyotropic liquid crystal material, and the lyotropic liquid crystal material may have a polarizing axis after an alignment process, such that light passes through the polarizing material layer 130 to form polarized light. The lyotropic liquid crystal material is formed by curing lyotropic liquid crystal (lyotropic liquid crystal) which is formed by dissolving amphiphilic molecules (amphiphiles) as liquid crystal molecules in a solvent at a specific concentration. For example, the lyotropic liquid crystal may include a dichroic dye (dichromatic dye) and an amphiphilic molecule as a liquid crystal molecule, such that the polarizing material layer 130 having the lyotropic liquid crystal material formed by curing the lyotropic liquid crystal includes the dichroic dye and the amphiphilic molecule. For example, the dichroic dye may be a compound derived from the following chemical formula 1.
[ Chemical formula 1]
The conventional polarizing film has a multi-layer structure, in which one side of the polarizing layer having a polarizing axis is provided with at least one protective layer and/or at least one adhesive layer (e.g., optical adhesive CLEAR ADHESIVE (OCA)), and the other side of the polarizing layer having a polarizing axis is provided with at least one protective layer and/or at least one adhesive layer, such that the polarizing layer does not directly contact structures other than the conventional polarizing film. In the present invention, since the polarizing material layer 130 has a single-layer structure, the polarizing material layer 130 of the present invention may have a relatively thin thickness in addition to directly contacting other structures, compared to the conventional polarizing film. For example, the thickness of the polarizing material layer 130 of the present invention may be 0.1 micrometers (μm) to 10 micrometers or 0.3 micrometers to 7 micrometers, but is not limited thereto. In addition, since the polarizing material layer 130 of the present invention has a single layer structure and a very thin thickness, the polarizing material layer 130 of the present invention may have a higher light transmittance than a conventional polarizing film.
Alternatively, when the front light module 100 is applied to a display device, the front light module 100 may further include a light shielding layer 140 (as shown in fig. 1), wherein the polarizing material layer 130 is disposed between the light shielding layer 140 and the light guiding plate 110, and the light shielding layer 140 directly contacts the polarizing material layer 130. For example, the light shielding layer 140 may include black photoresist, black ink, black resin, black pigment, metal, other suitable materials, or combinations thereof. The light shielding layer 140 may be used to shield a portion of the devices (e.g., opaque devices or traces underneath) or areas with poor display effect in the display device.
Alternatively, when the front light module 100 is applied to a display device, the front light module 100 may further include a color conversion layer 150 (as shown in fig. 1), wherein the polarizing material layer 130 is disposed between the color conversion layer 150 and the light guide plate 110, and the color conversion layer 150 directly contacts the polarizing material layer 130. In fig. 1, the color conversion layer 150 may include a plurality of conversion portions 152, and the light shielding layer 140 may be used to separate each of the conversion portions 152. For example, the light shielding layer 140 may have a plurality of openings, and the conversion portion 152 of the color conversion layer 150 may be disposed in the opening of the light shielding layer 140, so that the conversion portion 152 of the color conversion layer 150 may be surrounded by the light shielding layer 140, but not limited thereto. The color conversion layer 150 may include color filter (color filter), fluorescent (fluorescence) material, phosphorescent (phosphor) material, quantum Dot (QD) material, other suitable materials, or combinations thereof. In some embodiments, the conversion portion 152 of the color conversion layer 150 can perform different color conversions according to the requirements. For example, when the front light module 100 is applied to a color display device, the plurality of conversion portions 152 of the color conversion layer 150 may include a red conversion portion 152a, a green conversion portion 152b and a blue conversion portion 152c, but not limited thereto. For example, when the front light module 100 is applied to a monochrome display device, the conversion portion 152 of the color conversion layer 150 can convert the same color, or the front light module 100 does not include the color conversion layer 150.
In the present invention, the front light module 100 may further include other required components and structures according to the requirements.
Referring to fig. 2, fig. 2 is a schematic cross-sectional view of a reflective display device according to an embodiment of the invention. As shown in fig. 2, the reflective display device 200 includes the front light module 100, where the reflective display device 200 uses light generated by the front light module 100 as a light source for displaying a picture.
As shown in fig. 2, the reflective display device 200 includes a substrate 210, and the substrate 210 and the front light module 100 are disposed opposite to each other. The substrate 210 may be a hard substrate or a flexible substrate, and may include, for example, glass, plastic, quartz, sapphire, polymer (such as Polyimide (PI), polyethylene terephthalate (Polyethylene Terephthalate, PET)), other suitable materials or combinations thereof, according to the type thereof. In fig. 2, the normal direction of the substrate 210 may be parallel to the direction Z.
The display panel may include a plurality of pixels (pixels), and the pixels may include at least one sub-pixel (SP), wherein the sub-pixel SP may be formed by elements and structures between the substrate 210 and the light guide plate 110 of the front light module 100. In some embodiments, if the reflective display device 200 is a color display device, one pixel may include a plurality of sub-pixels SP (i.e., the plurality of sub-pixels SP form one pixel), for example, the plurality of sub-pixels SP include a red sub-pixel SP1 (e.g., the red conversion portion 152a of the color conversion layer 150 of the front light module 100), a green sub-pixel SP2 (e.g., the green conversion portion 152b of the color conversion layer 150 of the front light module 100), and a blue sub-pixel SP3 (e.g., the blue conversion portion 152c of the color conversion layer 150 of the front light module 100), but not limited thereto. In some embodiments, if the reflective display device 200 is a monochrome display device, one pixel may include one sub-pixel SP (i.e., one sub-pixel SP is one pixel), but is not limited thereto.
As shown in fig. 2, the reflective display device 200 includes a display medium layer 230 disposed between the substrate 210 and the front light module 100 such that the polarizing material layer 130 of the front light module 100 is disposed between the display medium layer 230 and the light guide plate 110 of the front light module 100. The display medium layer 230 may correspondingly include a suitable material according to the kind of the reflective display device 200. For example, the display medium layer 230 may include liquid crystal molecules, an electrophoretic material, or other suitable display medium materials, so that the reflective display device 200 may be a reflective liquid crystal display device, a reflective electrophoretic display device, a reflective electrowetting display device, or other suitable reflective display device, but is not limited thereto. The display medium material included in the display medium layer 230 may be adjusted by any suitable manner to adjust the state of the portion of the display medium layer 230 corresponding to each sub-pixel SP, and thus adjust the light transmittance of the light beam at each sub-pixel SP. For example, in some embodiments, the state of the display medium layer 230 may be controlled by an electric field (e.g., an electric field generated between the pixel electrode and the common electrode) and/or an electric signal.
In the present invention, the electrodes for controlling the state of the display medium layer 230 can be designed according to the requirements. For example, a plurality of electrodes for controlling the display medium layer 230 may be disposed on opposite sides of the display medium layer 230 (i.e., the display medium layer 230 is between the pixel electrode and the common electrode), but is not limited thereto. For example, the electrodes for controlling the display medium layer 230 may be disposed on the same side of the display medium layer 230 (e.g., the pixel electrode and the common electrode may be disposed between the display medium layer 230 and the substrate 210), but not limited thereto. In some embodiments, each of the sub-pixels SP may include at least two electrodes for controlling the display medium layer 230, so that the state of the display medium material of the corresponding sub-pixel SP in the display medium layer 230 can be adjusted according to the electrical signal (e.g., gray signal) received by the electrodes, thereby adjusting the light transmittance of each sub-pixel SP.
As shown in fig. 2, the circuit element layer 220 is disposed on the substrate 210 and is located between the display medium layer 230 and the substrate 210. The circuit element layer 220 may include at least one conductive layer, at least one insulating layer, at least one semiconductor layer, or a combination thereof to form electronic elements in the circuit element layer 220. Examples of the material of the conductive layer may include metal, transparent conductive material (such as Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), etc.), other suitable conductive material, or a combination thereof, examples of the material of the insulating layer may include inorganic insulating material (such as silicon oxide (SiO x), silicon nitride (SiN y), silicon oxynitride (SiO xNy)), organic insulating material (such as photosensitive resin), other suitable insulating material, or a combination thereof, examples of the material of the semiconductor layer may include polysilicon (poly-silicon), amorphous silicon (amorphous silicon), metal-oxide (metal-oxide semiconductor) semiconductor, other suitable semiconductor material, or a combination thereof, but not limited thereto.
The circuit element layer 220 may include any suitable electronic element to form a plurality of circuit units 222, wherein the electronic element may be formed by a film layer in the circuit element layer 220 described above, and each sub-pixel SP may include one circuit unit 222. For example, each circuit cell 222 of the circuit element layer 220 may include a switching element (not shown), wherein the switching element may be a top gate (top gate) thin film transistor, a bottom gate (bottom gate) thin film transistor, a dual gate (dual gate) thin film transistor, or other suitable switching element. It should be noted that the number of switching elements in each circuit unit 222 can be designed according to the requirements.
Each circuit unit 222 of the circuit element layer 220 may include a pixel electrode (not shown) for controlling the state of the display medium material of the corresponding sub-pixel SP in the display medium layer 230.
In addition, the circuit element layer 220 may further include a scan line and a data line, wherein the scan line may be used for transmitting a switching signal to control the on/off of the switching element, and the data line may be used for transmitting an electrical signal (e.g., a gray scale signal) related to adjusting the state of the display medium layer 230.
As shown in fig. 2, the circuit element layer 220 further includes a light reflecting layer 224 (i.e., the light reflecting layer 224 is disposed between the substrate 210 and the display medium layer 230), wherein the light reflecting layer 224 is configured to reflect the light provided by the front light module 100, so that the reflective display device 200 can display the front light module 100 as a light source, so that a user can see a display screen. In order to make the light reflecting layer 224 have a good reflecting effect on the light provided by the front light module 100, the light reflecting layer 224 may have a single-layer structure or a multi-layer structure including a metal reflecting layer, wherein the metal reflecting layer is used for reflecting the light provided by the front light module 100. In some embodiments, the material of the metal reflective layer may include a metal material having high reflectivity, such as silver, aluminum, or other suitable metal material.
Therefore, in fig. 2, after the light of the current light module 100 is emitted from the first surface 110a of the light guide plate 110, the light sequentially passes through the polarized light material layer 130, the color conversion layer 150 and the display medium layer 230, then the light is reflected by the light reflection layer 224 to form reflected light, and then the reflected light sequentially passes through the display medium layer 230, the color conversion layer 150, the polarized light material layer 130 and the light guide plate 110 to be emitted out of the reflective display device 200, so that a user can see a display screen.
In addition, in some embodiments, the pixel electrode in the circuit element layer 220 may belong to the light reflection layer 224, so that the light reflection layer 224 may receive an electrical signal to correspondingly adjust the state of the display medium material of the display medium layer 230 in addition to reflecting the light provided by the front light module 100. In other embodiments, the pixel electrode and the light reflecting layer 224 in the circuit element layer 220 are different from each other, and thus, the light reflecting layer 224 is simply used to reflect the light provided by the front light module 100.
In addition, the reflective display device 200 further includes a common electrode (not shown) disposed at any suitable place, such that the electric field generated by the pixel electrode and the common electrode controls the state of the display medium material of the display medium layer 230. For example, when the pixel electrode and the common electrode are disposed on opposite sides of the display medium layer 230, the common electrode may be disposed in the front light module 100 such that the common electrode is located between the display medium layer 230 and the color conversion layer 150 (or between the display medium layer 230 and the polarizing material layer 130), and the common electrode includes a transparent conductive material, but is not limited thereto. For example, when the pixel electrode and the common electrode are disposed on the same side of the display medium layer 230, the common electrode may be disposed in the circuit element layer 220, but not limited thereto.
In addition, the reflective display device 200 may also include other suitable elements and structures. In some embodiments, the reflective display device 200 may further include a planarization layer (not shown) disposed in the front light module 100 and positioned between the display medium layer 230 and the color conversion layer 150 (or between the display medium layer 230 and the polarizing material layer 130) to provide a relatively flat surface. For example, the planarization layer may be disposed between the color conversion layer 150 and the common electrode (or between the polarizing material layer 130 and the common electrode), so that the common electrode may be disposed on the planarization layer having a planar surface, thereby enhancing the control effect of the pixel electrode and the common electrode on the display medium material of the display medium layer 230.
In the conventional reflective display device, in addition to a conventional polarizing film having a multi-layer structure provided between a light guide plate of a front light module and a display medium layer, an opposite substrate is provided between the conventional polarizing film and the display medium layer. Accordingly, compared to the conventional reflective display device, the reflective display device 200 of the present invention not only simplifies the conventional polarizing film to remove the protective layer and the adhesive layer, but also removes the opposite substrate. Therefore, the present invention reduces the overall thickness of the reflective display device 200 and reduces the attenuation of the light provided by the front light module 100 in the reflective display device 200 by reducing the number of film layers in the reflective display device 200.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a manufacturing method of a front light module according to an embodiment of the invention, wherein fig. 3 particularly illustrates a forming process of the polarizing material layer 130 according to an embodiment of the invention. It should be noted that the manufacturing method of the present invention is not limited by the following description and the accompanying drawings. In some embodiments, any other suitable step may be added before or after one of the existing steps of the manufacturing method, and/or some of the steps may be performed simultaneously or separately.
In the fabrication methods described below, the film and/or structure formation process may include, for example, atomic layer deposition (atomic layer deposition, ALD), chemical vapor deposition (chemical vapor deposition, CVD), physical vapor deposition (physical vapor deposition, PVD), a coating process, other suitable processes, or combinations thereof. The patterning process may, for example, include a photolithography (photolithography) process, a combination of a photolithography process and an etching process (etching process), any other suitable process, or a combination thereof, wherein the etching process may be a wet etching process, a dry etching process, any other suitable etching process, or a combination thereof. The curing process may, for example, include a photo curing process, a dry curing process, any other suitable curing process, or a combination thereof. The drying and curing process may include, for example, natural drying, reduced pressure drying, heating drying, reduced pressure heating drying, etc., and the temperature of the drying and curing process performed by heating may be 50 ℃ to 120 ℃, but is not limited thereto.
As shown in fig. 1 and 3, the light guide plate 110 is provided first, and then the polarizing material layer 130 is formed on the light guide plate 110, wherein the polarizing material layer 130 directly contacts the first surface 110a of the light guide plate 110. In forming the polarizing material layer 130 of some embodiments, the polarizing material 130m (e.g., lyotropic liquid crystal) may be disposed on the first surface 110a of the light guide plate 110 by any suitable forming process, and the polarizing axis may be defined by aligning the polarizing material 130m (e.g., lyotropic liquid crystal) by any suitable alignment means (e.g., coating direction, irradiation, etc.), and then the polarizing material 130m (e.g., lyotropic liquid crystal) may be cured by any suitable curing process to form the polarizing material layer 130.
In some embodiments, in fig. 3, a polarizing material 130m (e.g., a lyotropic liquid crystal) may be disposed on the first surface 110a of the light guide plate 110 through a coating process. For example, in fig. 3, the polarizing material 130m (e.g., lyotropic liquid crystal) may be sprayed on the first surface 110a of the light guide plate 110 along a first direction (a horizontal direction) by the nozzle NE to complete the arrangement and the orientation of the polarizing material 130m, wherein the polarizing axis is related to the first direction (e.g., the polarizing axis is parallel or perpendicular to the first direction), but not limited thereto. For example, the polarizing material 130m may include a dichroic dye, an amphiphilic molecule as a liquid crystal molecule, and an Ultraviolet (UV) resin, but is not limited thereto. Then, in the embodiment of fig. 3, since the polarizing material 130m has UV resin, the curing process of the present embodiment may be performed by irradiating the polarizing material 130m with UV light, but is not limited thereto.
Alternatively, according to the structure of the front light module 100 shown in fig. 1, the light shielding layer 140 and the color conversion layer 150 may be disposed on the polarizing material layer 130 through a suitable forming process and patterning process, so that the light shielding layer 140 and the color conversion layer 150 directly contact the polarizing material layer 130. Alternatively, a planarization layer and a common electrode may be sequentially disposed on the color conversion layer 150 through a suitable forming process and patterning process.
Finally, the light emitting element 120 is disposed adjacent to the light incident surface 110e of the light guide plate 110, so as to complete the manufacture of the front light module 100.
In addition, in the manufacturing process of the reflective display device 200, the front light module 100 may be assembled with the array substrate structure including the substrate 210 and the circuit element layer 220, and the display medium layer 230 may be disposed between the front light module 100 and the array substrate structure. Thereafter, the display medium layer 230 is aligned to complete the manufacturing of the reflective display device 200.
In summary, the present invention reduces the number of the front light module and the film layer of the reflective display device by designing the light guide plate and the polarizing material layer, thereby reducing the structure thickness and reducing the attenuation of the light provided by the front light module in the reflective display device.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
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| CN202311084743.7A CN119535836A (en) | 2023-08-28 | 2023-08-28 | Front light module, reflective display device and method for manufacturing front light module |
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| CN202311084743.7A CN119535836A (en) | 2023-08-28 | 2023-08-28 | Front light module, reflective display device and method for manufacturing front light module |
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