CN113707006A - Functional assembly and display device having the same - Google Patents

Functional assembly and display device having the same Download PDF

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Publication number
CN113707006A
CN113707006A CN202010430229.4A CN202010430229A CN113707006A CN 113707006 A CN113707006 A CN 113707006A CN 202010430229 A CN202010430229 A CN 202010430229A CN 113707006 A CN113707006 A CN 113707006A
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China
Prior art keywords
display device
plate
dielectric layer
module
light
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CN202010430229.4A
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Chinese (zh)
Inventor
王朝仁
余仁斌
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E Ink Holdings Inc
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E Ink Holdings Inc
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Priority to CN202010430229.4A priority Critical patent/CN113707006A/en
Publication of CN113707006A publication Critical patent/CN113707006A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention discloses a functional assembly and a display device with the same. The functional assembly comprises a composite cover plate, a reflective display panel and at least one dielectric layer. The composite cover plate comprises a first plate and a second plate. The second plate is positioned between the first plate and the reflective display panel. The dielectric layer is positioned between the first plate of the composite cover plate and the reflective display panel, wherein the refractive index of the dielectric layer is greater than or equal to 1 and less than 1.474. The medium layer with the refractive index larger than or equal to 1 and smaller than 1.474 replaces the conventional optical adhesive layer (with the refractive index of 1.474), so that the optical contrast of the front optical module in the on state and the off state can be balanced by the medium layer. In addition, the design does not increase the complexity of the whole stack structure of the display device, so the difficulty of adjusting the variation of the optical contrast is not increased, and the original mechanism design of the display device is not damaged.

Description

Functional assembly and display device having the same
Technical Field
The present invention relates to a display device, and more particularly, to a display device having a front light module.
Background
In order to increase the optical contrast of a display device using a front light module, two methods are generally used. When the front light module is closed, an anti-reflection layer can be added on the surface of the display device, so that the proportion of external ambient light reaching the reflective display panel is increased. When the front light module is started, the upper side and the lower side of the light guide plate emit light asymmetrically by using the mesh points or the microstructures of the light guide plate, so that the optical contrast of the front light module is increased when the front light module is started.
However, when the front optical module is turned on, the light enters the light guide plate to form a surface light source, so that the optical contrast of the front optical module is poor when the front optical module is turned on. In addition, the arrangement of the anti-reflection layer can greatly increase the optical contrast when the front light module is closed, so that the variation of the optical contrast of the display device is increased, and the situation experience of a user is reduced. In other words, the conventional methods for increasing the contrast characteristics of the front light module during the turning-off and turning-on operations interfere with each other, and the difference between the optical contrast of the front light module during the turning-off and turning-on operations is increased.
On the other hand, in addition to the consideration of optical characteristics, the complexity of the overall stack of the display device is large, and therefore, if more stacks are added, it becomes more difficult to adjust the optical contrast of the display device. In view of the above, it is still one of the objectives of the present invention to provide a display device that can reduce the variation of the optical contrast of the display device without making the entire stack of the display device more complicated.
Disclosure of Invention
One aspect of the present invention is a functional assembly applied to a display device, which does not increase the complexity of the entire stack structure of the display device, and therefore does not increase the difficulty of adjusting the variation of the optical contrast, and does not damage the original mechanical design of the display device.
In some embodiments, the functional component is applied to a front light module of a display device. The functional assembly comprises a composite cover plate, a reflective display panel and at least one dielectric layer. The composite cover plate comprises a first plate and a second plate. The second plate is positioned between the first plate and the reflective display panel. The dielectric layer is positioned between the first plate of the composite cover plate and the reflective display panel, wherein the refractive index of the dielectric layer is greater than or equal to 1 and less than 1.474.
In some embodiments, the dielectric layer is between the first sheet and the second sheet.
In some embodiments, the functional device further comprises a touch module disposed between the composite cover plate and the reflective display panel, wherein the dielectric layer is disposed between the composite cover plate and the touch module or between the touch module and the reflective display panel.
In some embodiments, the number of the dielectric layers is two, the functional device further includes a touch module located between the composite cover plate and the reflective display panel, one of the dielectric layers is located between the first plate and the second plate, and the other of the dielectric layers is located between the second plate and the touch module or between the touch module and the reflective display panel.
In some embodiments, the number of the dielectric layers is two, the display device further includes a touch module located between the composite cover plate and the reflective display panel, one of the dielectric layers is located between the second plate and the touch module, and the other of the dielectric layers is located between the touch module and the reflective display panel.
In some embodiments, the functional device further includes a touch module disposed between the composite cover plate and the reflective display panel, wherein the number of the dielectric layers is three, and the three dielectric layers are respectively disposed between the first plate and the second plate, between the touch module and the second plate, and between the touch module and the reflective display panel.
Another aspect of the present invention is a display device.
In some embodiments, the display device includes a functional component and a front light module. The front light module comprises a light guide plate and a light source. The functional assembly comprises a composite cover plate, a reflective display panel and a dielectric layer. The composite cover plate comprises a first plate and a second plate. The front light module is positioned between the composite cover plate and the reflective display panel. The medium layer is positioned between the first plate of the composite cover plate and the light guide plate, wherein the refractive index of the medium layer is greater than or equal to 1 and less than 1.474.
In some embodiments, the dielectric layer is between the first sheet and the second sheet.
In some embodiments, the functional device further comprises a touch module disposed between the composite cover plate and the light guide plate, wherein the dielectric layer is disposed between the composite cover plate and the touch module or between the touch module and the light guide plate.
In some embodiments, the number of the dielectric layers is two, the functional device further includes a touch module located between the composite cover plate and the light guide plate, one of the dielectric layers is located between the first plate and the second plate, and the other of the dielectric layers is located between the second plate and the touch module or between the touch module and the light guide plate.
In some embodiments, the number of the dielectric layers is two, the dielectric layers include a first sublayer and a second sublayer, the display device further includes a touch module located between the composite cover plate and the light guide plate, one of the dielectric layers is located between the second plate and the touch module, and the other of the dielectric layers is located between the touch module and the light guide plate.
In some embodiments, the functional device further includes a touch module disposed between the composite cover plate and the light guide plate, wherein the number of the dielectric layers is three, and the three dielectric layers are respectively disposed between the first plate and the second plate, between the touch module and the second plate, and between the touch module and the light guide plate.
In some embodiments, the dielectric layer is a layer of air.
In some embodiments, the layer of air is between the first sheet and the second sheet of the composite deck.
In some embodiments, the display device further includes a touch module disposed between the composite cover plate and the light guide plate, wherein the air layer is disposed between the touch module and the light guide plate.
In the above embodiment, the medium layer with a refractive index greater than or equal to 1 and less than 1.474 is used to replace the conventional optical adhesive layer (refractive index of 1.474), so that the optical contrast of the front light module in the on state and the off state can be balanced by the medium layer. In some embodiments, the display device of the invention can improve the optical contrast of the front light module when the front light module is turned on through the dielectric layer. In addition, the design of replacing the known optical adhesive layer by the dielectric layer does not increase the complexity of the whole stack structure of the display device, so the difficulty of adjusting the variation of the optical contrast is not increased, and the original mechanism design of the display device is not damaged.
Drawings
Fig. 1 is a cross-sectional view of a display device according to an embodiment of the invention.
Fig. 2 is a cross-sectional view of an exemplary display device, wherein the front light module is in an off state and the reflective display panel is in a dark state.
FIG. 3 is a cross-sectional view of an exemplary display device in which a front light module is in an off state and a reflective display panel is in a bright state.
FIG. 4 is a cross-sectional view of an exemplary display device in which a front light module is turned on and a reflective display panel is in a dark state.
FIG. 5 is a cross-sectional view of an exemplary display device in which the front light module is turned on and the reflective display panel is in a bright state.
FIG. 6 shows simulated data of optical contrast and variation of optical contrast according to various embodiments of the present invention.
Fig. 7 is a cross-sectional view of a display device according to another embodiment of the present invention.
Fig. 8 is a cross-sectional view of a display device according to another embodiment of the present invention.
FIG. 9 shows experimental data of optical contrast and variation of optical contrast according to various embodiments of FIG. 6.
Fig. 10 is a graph of refractive index simulation data for the display devices according to fig. 1, 7 and 8.
Fig. 11 is a cross-sectional view of a display device according to another embodiment of the present invention.
Fig. 12 is a cross-sectional view of a display device according to another embodiment of the present invention.
Fig. 13 is a cross-sectional view of a display device according to another embodiment of the present invention.
Fig. 14 is a cross-sectional view of a display device according to another embodiment of the present invention.
Fig. 15 is a graph of refractive index simulation data for the display devices according to fig. 11, 12, 13 and 14.
Fig. 16 is a cross-sectional view of a display device according to another embodiment of the present invention.
Fig. 17 is a cross-sectional view of a display device according to another embodiment of the present invention.
Fig. 18 is experimental data of optical contrast and an amount of change in optical contrast according to the embodiment of fig. 16 and 17.
Fig. 19 is a cross-sectional view of a display device according to another embodiment of the present invention.
Description of the main reference numerals:
10,10a,10 b-display means; 100-functional components; 110-a composite cover plate; 112-a first sheet material; 114-a second sheet material; 116-a print layer; 118-an optical glue layer; 118a,118b, -a dielectric layer; 1182a,1184 a-interface; (ii) a 120, 120', 120 "-reflective display panel; 130-a touch module; 132-an electrode layer; 134-touch layer; 140-an optical glue layer; 140 a-dielectric layer; 142a,144 a-interface; 150-an optical glue layer; 150a,150 b-dielectric layer; 152a,154 a-interface; 200-a front light module; 210-a light guide plate; 220-a light source; 230-an optical glue layer; d1-first direction; d2-second direction; IA-ambient incident light; RA, RL 2-reflected light; l1, L2-ray; r1, r2, r3, r 4-interface reflects light; light penetration of F, F ', F + F', N, N ', N + N'; CRON, CROFF-optical contrast; Δ CR-amount of change in optical contrast; r1 ', r 2' -reflects light.
Detailed Description
In the following description, numerous implementation details are set forth in order to provide a thorough understanding of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner. And the thickness of layers and regions in the drawings may be exaggerated for clarity, and the same reference numerals denote the same elements in the description of the drawings.
Fig. 1 is a cross-sectional view of a display device 10 according to an embodiment of the invention. The display device 10 includes a functional element 100 and a front light module 200. The functional device 100 includes a composite cover plate 110, a reflective display panel 120, a touch module 130, an optical adhesive layer 140, and a dielectric layer 150 a. The front light module 200 is located between the composite cover plate 110 and the reflective display panel 120. In the embodiment, the touch module 130 is located between the composite cover plate 110 and the front light module 200, but the invention is not limited thereto. In some other embodiments, the touch module 130 may also be located at the other side of the light guide plate 210.
The composite cover sheet 110 includes a first sheet 112, a second sheet 114, a print layer 116, and an optical glue layer 118. The optical adhesive layer 118 is located between the first plate 112 and the second plate 114. In the embodiment, the print layer 116 is disposed on the surface of the first plate 112 facing the second plate 114 and is in contact with the optical adhesive layer 118, but the invention is not limited thereto. For example, in some embodiments, the number of the printing layers 116 may be two, and the two printing layers are respectively located on the lower surfaces of the first plate 112 and the second plate 114. The touch module 130 includes an electrode layer 132 and a touch layer 134. The front light module 200 includes a light guide plate 210, a light source 220, and an optical adhesive layer 230. The optical adhesive layer 230 is located between the light guide plate 210 and the reflective display panel 120.
The optical adhesive layer 140 is located between the second plate 114 of the composite cover plate 110 and the electrode layer 132 of the touch module 130. The dielectric layer 150a is located between the touch module 130 and the light guide plate 210. The refractive index of the dielectric layer 150a is 1 or more and less than 1.474. In the embodiment, the dielectric layer 150a may be an optical glue including a silicon-based material, and the refractive index of the dielectric layer 150a is about 1.41, but the invention is not limited thereto. In other examples, the dielectric layer 150a may also be a transparent coating having a refractive index of 1 or more and less than 1.474. The optical adhesive layer 118, the optical adhesive layer 140 of the composite cover plate 110 and the optical adhesive layer 230 of the front light module 200 are optical adhesives containing acrylic resin, and the refractive index of the optical adhesive layer 118, the optical adhesive layer 140 and the optical adhesive layer 230 is about 1.474. In other words, the dielectric layer 150a has a refractive index smaller than that of the conventional optical adhesive layer. That is, the refractive index difference between the dielectric layer 150a and the touch module 130 increases, and the refractive index difference between the dielectric layer 150a and the light guide plate 210 also increases.
In the following paragraphs, the optical contrast variation represents a difference between the optical contrast when the front light module 200 of the display device 10 is turned off and the optical contrast when the front light module 200 is turned on. The optical contrast when the front light module 200 is turned off represents a ratio between the luminance in a bright State (White State, that is, the image of the reflective display panel 120 is completely White) and the luminance in a Dark State (Dark State, that is, the image of the reflective display panel 120 is completely black) when the front light module 200 of the display device 10 is turned off. The optical contrast when the front light module 200 is turned on represents a ratio between the luminance in a bright State (White State) and the luminance in a Dark State (Dark State) when the front light module 200 of the display device 10 is turned on. The display device 10 of the present invention can balance the optical contrast of the front light module 200 in the on state and the off state respectively through the dielectric layer 150a to reduce the variation of the optical contrast. In the following paragraphs, simulation data and experimental data of optical contrast will be described with reference to the drawings to explain the above principles and the efficacy of the display device 10.
Fig. 2 to 5 are cross-sectional views of exemplary display devices in different states, respectively. In fig. 2 to 5, the same elements as those of the display device 10 of fig. 1 will be denoted by the same reference numerals. The display device shown in fig. 2 to 5 has the optical glue layer 150 including acrylic resin without the dielectric layer 150a as shown in fig. 1. In other words, the refractive indexes of the optical adhesive layers 118, 140, 150, and 230 in fig. 2 to 5 are all exemplified by 1.474 to calculate the optical contrast of the conventional display device. In addition, the first plate material 112 in fig. 2 to 5 is made of polyethylene terephthalate (PET) material, and has a refractive index of about 1.64. The second plate 114 and the light guide plate 210 are made of Polycarbonate (PC) material, for example, and have refractive indexes of about 1.58. The electrode layer 132 is made of a material including a transparent electrode (e.g., ITO) and has a refractive index of about 1.82. It should be understood that in subsequent simulation calculations, only normal incidence and reflection are considered, ignoring the effects of polarization, multiple reflections and refractions, and the absorption coefficient of the material. In addition, since the simulation calculation is performed under an ideal condition, the simulation values calculated by the display devices under different conditions cannot reflect the actual physical parameters. Therefore, in the following description, only the ratio of the simulation data between the display devices with different conditions is used as a comparison basis.
Fig. 2 is a cross-sectional view of an exemplary display device, wherein the front light module 200 is in an off state and the reflective display panel 120 ″ is in a dark state. As shown in fig. 2, the ambient incident light ray IA from the outside travels from the air toward the reflective display panel 120 ", i.e. the ambient incident light ray IA travels from the composite cover 110 toward the reflective display panel 120" along the first direction D1. When the ambient incident light IA passes through the interface formed by each adjacent structure, the ambient incident light IA will generate partial penetration and partial reflection phenomena due to the difference of refractive index. The ambient incident light IA passes through nine interfaces, where the sum of the reflected light rays r1 from the nine interfaces traveling toward the second direction D2 is represented as the interface reflected light ray. Since the reflective display panel 120 ″ is in a dark state, a portion of the incident ambient light IA traveling to the reflective display panel 120 ″ is absorbed. Ideally, the remainder of the ambient incident light IA traveling to the reflective display panel 120' is completely absorbed. The light penetration F (r1) represents the sum of the light penetrations of the front light module 200 in the off state and the display device in the dark state, which reaches the instrument or human eyes, i.e., the sum of the light penetrations going toward the second direction D2.
Fig. 3 is a cross-sectional view of an exemplary display device, wherein the front light module 200 is in an off state and the reflective display panel 120' is in a bright state. As shown in fig. 2, when the ambient incident light IA passes through the interface formed by each adjacent structure, the ambient incident light IA is partially transmitted and partially reflected due to the difference of refractive indexes. Since the reflective display panel 120 'is in a bright state, a portion of the incident ambient light IA traveling to the reflective display panel 120' is reflected. Ideally, the rest of the ambient incident light IA traveling to the reflective display panel 120' is totally reflected to form the reflected light RA traveling along the second direction D2. However, when the reflected light RA passes through the interface formed by each adjacent structure, the reflected light RA is partially transmitted and partially reflected due to the difference in refractive index. The reflected light RA passes through nine interfaces, where the sum of the reflected light from the nine interfaces traveling in the first direction D1 is represented by an interface reflected light r 2. The light transmission F '(RA) represents the total light transmission reflected by the reflective display panel 120' to the instrument or human eye. This is why. The light transmission F (r1) + F' (RA) represents the total light transmission to the instrument or human eyes when the front light module 200 is in the off state and the display device is in the on state. The optical contrast of the front light module 200 of the display device when it is turned off can be calculated from the boundary conditions shown in fig. 2 and 3, and is equivalent to a value obtained by dividing the light transmittance F (r1) + F' (RA) by the light transmittance F (r 1).
Fig. 4 is a cross-sectional view of an exemplary display device, wherein the front light module 200 is in an on state and the reflective display panel 120 ″ is in a dark state. When the front light module 200 is turned on, since the brightness of the light from the light source 220 is much greater than the brightness of the external ambient light, the external ambient light can be ignored. A portion of the light L1 of the front light module 200 is guided by the light guide plate 210 to travel along the second direction D2, and another portion of the light L2 travels along the first direction D1 to the reflective display panel 120 ″. Since the reflective display panel 120 "is in a dark state, the light L2 traveling to the reflective display panel 120" is ideally completely absorbed. When the light L1 traveling along the second direction D2 passes through the interface formed by each adjacent structure, the light L1 is partially transmitted and partially reflected due to the difference in refractive index. The light L1 passes through eight interfaces in total, where the interface reflected light r3 represents the sum of the reflected light from the eight interfaces traveling toward the first direction D1. The light penetration N (L1) represents a sum of light penetrations of the front light module 200 in the on state and the display device in the dark state to the instrument or human eyes, i.e., a sum of light penetrations proceeding toward the second direction D2.
Fig. 5 is a cross-sectional view of an exemplary display device, wherein the front light module 200 is turned on and the reflective display panel 120' is in a bright state. Since the reflective display panel 120 'is in a bright state, the light L2 traveling to the reflective display panel 120' is reflected. Ideally, the remaining portion of the light L2 traveling to the reflective display panel 120' is completely reflected to form the reflected light RL2 traveling along the second direction D2. However, when the reflected light RL2 passes through the interface formed by each adjacent structure, the reflected light RL2 is partially transmitted and partially reflected due to the difference in refractive index. The reflected light RL2 passes through nine interfaces, where the sum of the reflected light from the nine interfaces traveling toward the first direction D1 is represented by the interface reflected light r 4. The light transmission N '(RL 2) represents the total light transmission reflected by the reflective display panel 120' to the instrument or human eye. This is why. The light transmission N (L1) + N '(RL 2) represents the total light transmission reaching the instrument or human eyes when the front light module 200 is turned on and the reflective display panel 120' is bright. The optical contrast of the front light module 200 of the display device when turned on can be calculated from the boundary conditions shown in fig. 4 and 5, which is equivalent to the value obtained by dividing the light transmittance N (L1) + N' (RL2) by the light transmittance N (L1).
Referring to fig. 6, fig. 6 is a simulation calculation data of optical contrast and optical contrast variation according to various embodiments of the present invention. The light transmission F, the light transmission F + F ', and the optical contrast (F + F')/F in FIG. 6 are calculated according to the boundary conditions shown in FIGS. 2 and 3. The light transmission N, the light transmission N + N ', and the optical contrast (N + N')/N are calculated according to the boundary conditions shown in fig. 4 and 5. The optical contrast variation Δ CR represents a difference between the optical contrast (F + F ')/F when the front light module 200 is turned off and the optical contrast (N + N')/N when the front light module 200 is turned on.
The data in column 3 of fig. 6 represents the simulation calculation data of the conventional display device shown in fig. 2 to 5. The data in column 4 of fig. 6 represents the simulated calculation data of the display device 10 of fig. 1. From the data in columns 3 and 4, it can be seen that the optical contrast (F + F ')/F of the display device 10 when the front light module 200 is off is slightly lower than the optical contrast (F + F')/F of the conventional display device. The optical contrast (N + N ')/N of the display device 10 when the front-light module 200 is turned on is maintained at a value substantially equal to the optical contrast (N + N')/N of the known display device.
Referring to fig. 1 and 2, since the refractive index of the dielectric layer 150a is lower than that of the optical adhesive layer 150 in fig. 2, the refractive index difference between the dielectric layer 150a and the adjacent structure is increased, thereby increasing the reflectivity of the interface. As shown in fig. 1, the amount of light r 1' reflected by the medium layer 150a facing and contacting the light guide plate 210 and the interfaces 152a and 154a of the touch layer 134 is increased, so that the display device 10 has a larger interface reflected light r1 (see fig. 2). In other words, the interface reflected light r1 (see fig. 2) increases such that the light transmission F (r1) increases, and the amount of light traveling to the reflective display panel 120 decreases. Similarly, as shown in FIG. 1, the reflected light r 2' at the interface 152a and the interface 154a increases, so that the display device 10 has a larger interface reflected light r 2. In other words, the increase of the interface reflected light r2 (see fig. 3) reduces the light transmission amount F '(RA), thereby slightly decreasing the optical contrast (F + F')/F of the display device 10 when the front light module 200 is turned off. Similarly, the light transmittance N (L1) decreases as the light r3 (see fig. 4) reflected by the display device 10 increases, and the light transmittance N' (RL2) decreases as the light r4 (see fig. 5) reflected by the display device 10 increases. Therefore, the optical contrast (N + N')/N of the display device 10 when the front light module 200 is turned on is maintained at substantially the same value.
Referring to fig. 6, the analog value of the optical contrast variation Δ CR of the conventional display device is about 9.25, and the analog value of the optical contrast variation Δ CR of the display device 10 shown in fig. 1 is about 7.39. As can be seen from this, the analog value of the optical contrast variation Δ CR is the same as the above-described trend of the change in the optical contrast (F + F ')/F of the display device 10 when the front light module 200 is turned off and the change in the optical contrast (N + N')/N of the display device 10 when the front light module 200 is turned on. In other words, by disposing the dielectric layer 150a with a lower refractive index between the light guide plate 210 and the composite cover plate 110, the optical contrast variation Δ CR of the display device 10 can be reduced, thereby improving the user experience.
Fig. 7 is a cross-sectional view of a display device 10a according to another embodiment of the present invention. The display device 10a is substantially the same as the display device 10 shown in fig. 1, except that the composite cover 110a of the display device 10a includes a dielectric layer 118a between a first sheet 112 and a second sheet 114. The display device 10a does not have the dielectric layer 150a (see fig. 1) between the light guide plate 210 and the touch module 130, but has the optical adhesive layer 150. Therefore, the dielectric layer 118a has an interface 1182a and an interface 1184a facing and contacting the second board 114 and the first board 112, respectively, and the interface 1182a and the interface 1184a may increase the reflected light r 1', and thus increase the interface reflected light r1 (see fig. 2). The interface 1182a and the interface 1184a may increase the reflected light r 2', and thus the reflected light r2 (see fig. 3) of the interface. The trend of the display device 10a when the front light module 200 is turned off and on is the same as that of the display device 10, and is not described herein again.
Fig. 8 is a cross-sectional view of a display device 10b according to another embodiment of the present invention. The display device 10b is substantially the same as the display device 10 shown in fig. 1, except that the display device 10b includes a dielectric layer 140a between the composite cover 110 and the touch module 130. The display device 10b does not have the dielectric layer 150a (see fig. 1) between the light guide plate 210 and the touch module 130, but has the optical adhesive layer 150. Therefore, the dielectric layer 140a has an interface 142a and an interface 144a facing and contacting the touch module 130 and the second plate 114, respectively. The interface 142a and the interface 144a increase the reflected light r 1', and thus the interface reflected light r1 (see fig. 2). The interface 142a and the interface 144a increase the reflected light r 2', and thus the interface reflected light r2 (see fig. 3). The trend of the display device 10b when the front light module 200 is turned off and on is the same as that of the display device 10, and is not described herein again.
FIG. 9 shows experimental data of optical contrast and variation of optical contrast according to various embodiments of FIG. 6. In this embodiment, the optical characteristics of the display device in different states are measured, for example, by a spectroscopic luminance (e.g., PR-655, TEO Co,. Ltd.). Referring to fig. 6 and 9 together, columns 3 and 4 in fig. 9 are experimental data obtained from the conventional display device shown in fig. 2 to 5 and the display device 10 of fig. 1, respectively. The optical contrast CROFF represents the optical contrast when the front light module 200 is turned off, and the optical contrast CRON represents the optical contrast when the front light module 200 is turned on. The optical contrast variation Δ CR is derived from the relationship (CRON-CROFF)/CROFF.
As can be seen from the data in fig. 6 and 9, the optical contrast variation Δ CR of the display device 10 is reduced, which is the same as the trend exhibited by the simulation calculation data. Since the refractive index of the dielectric layer 150a of the display device 10 is low, the waveguide effect of the light guide plate 210 is enhanced. In other words, the lower the refractive index of the material above the light guide plate 210, the greater the proportion of the light that is totally reflected and travels toward the reflective display panel 120. Therefore, compared to the simulation data, it is also shown in fig. 9 that the optical contrast ratio CRON of the front light module 200 can be increased by disposing the dielectric layer 150a, and the optical contrast variation Δ CR of the display device 10 can be reduced. In addition, the design of replacing the conventional optical adhesive layer with the dielectric layer 150a does not increase the complexity of the whole stack structure of the display device 10, so the difficulty of adjusting the optical contrast variation Δ CR is not increased, and the original mechanical design of the display device 10 is not damaged.
Fig. 10 is a graph of refractive index simulation data for the display devices according to fig. 1, 7 and 8. Fig. 10 shows, in columns 1 and 2, a stack of the display device 10 according to fig. 1 and corresponding refractive index simulation data. Fig. 10 shows, in columns 3 and 4, a stack of the display device 10a according to fig. 7 and the corresponding refractive index simulation data. Fig. 10 shows, in columns 5 and 6, a simulation of the stack and the corresponding refractive index of the display device 10b according to fig. 8. The equivalent refractive index shown in the figure represents simulation data of the equivalent refractive index of each layer structure between the first plate 112 and the light guide plate 210. The simulated data for the equivalent refractive index of the display device 10 is approximately 1.2688. The simulated data for the equivalent refractive index of display device 10a is approximately 1.2688. The simulated data for the equivalent refractive index of display device 10b is approximately 1.2566. Therefore, since the refractive index-adjustable dielectric layer (e.g., the dielectric layer 150a in fig. 1) is located between the first plate 112 and the light guide plate 210, the equivalent refractive index of each layer structure between the first plate 112 and the light guide plate 210 can be reduced by replacing the conventional optical adhesive layer (refractive index of 1.474) with the dielectric layer. In other words, the dielectric layer can reduce the equivalent refractive index of the medium above the light guide plate 210, thereby enhancing the waveguide effect of the light guide plate 210. Therefore, the display device 10a and the display device 10b may also have similar technical effects as the display device 10 shown in fig. 1, and are not described herein again.
See column 7 of FIG. 6 for data representing simulated calculations made from another display device used as a control. The display device is a display device in which the optical adhesive layer 230 of the front light module 200 is changed into the dielectric layer with the refractive index of 1 to less than 1.474. As can be seen from the data in column 7, the light transmittance N of the front light module 200 is increased when the reflective display panel 120 "is turned on and is in a dark state. Referring to fig. 4, when the refractive index difference between the light guide plate 210 and the optical adhesive layer 230 becomes larger (i.e. when the optical adhesive layer 230 is replaced by a dielectric layer), it can be regarded as enhancing the light guiding effect of the light guide plate 210 towards the second direction D2, so that the light L1 is increased, and the interface between the light guide plate 210 and the dielectric layer (i.e. the position of the optical adhesive layer 230 in the figure) does not contribute to the reflected light r3, so that the light penetration N of the front light module 200 when it is turned on is increased. Thus, the optical contrast (N + N')/N when the front light module 200 is turned on is reduced. In addition, the optical contrast variation Δ CR of the display device under this condition is also only slightly lower than that of the known display device.
See column 8 of FIG. 6 for data representing simulated calculations made from another display device used as a control. In the display device, a dielectric layer with a refractive index of 1 or more and less than 1.474 is arranged on the surface of the first plate 112 opposite to the second plate 114. Since such a structure can be regarded as the design of the surface anti-reflective layer, the light transmittance F is greatly reduced when the front light module 200 is turned off and the reflective display panel 120 ″ is in a dark state, and the optical contrast (F + F')/F is greatly increased when the front light module 200 is turned off, as can be seen from the data in column 8. As a result, the optical contrast variation Δ CR increases. As can be seen from the data in columns 7 and 8, the optical contrast variation Δ CR can be significantly reduced by disposing a dielectric layer with a lower refractive index between the first plate 112 and the light guide plate 210.
Fig. 11 is a cross-sectional view of a display device 10c according to another embodiment of the present invention. Display device 10c is substantially the same as display device 10 of FIG. 1, except that display device 10c further includes a dielectric layer 118a between first sheet 112 and second sheet 114. In other words, the dielectric layer 118a of the display device 10c has an interface 1182a and an interface 1184a facing and contacting the second board 114 and the first board 112, respectively, and the dielectric layer 150a has an interface 152a and an interface 154a facing and contacting the light guide plate 210 and the touch layer 134, respectively. As can be seen from the foregoing description of the technical efficacy of the display device 10, the difference in refractive index between the interface and the adjacent material increases, so that the reflected light is increased. Therefore, the display device 10c also has the technical effects of the display device 10, and the description thereof is omitted.
Refer to fig. 6 and 9. The data in column 5 of fig. 6 represents the simulation calculation data of the display device 10c in fig. 11. The 5 th column in fig. 9 shows experimental data obtained from the display device 10 c. As can be seen from the data in fig. 6 and 9, the refractive indexes of the dielectric layers 150a and 118a of the display device 10c are low, so that the waveguide effect of the light guide plate 210 is enhanced. In addition, as can be seen from the experimental data of fig. 9, the optical contrast variation Δ CR of the display device 10c is lower than the optical contrast variation Δ CR of the display device 10. It is presumed that the effect of reducing the optical contrast variation Δ CR is enhanced as the number of dielectric layers having a lower refractive index is larger. In other words, the effect of reducing the optical contrast variation Δ CR should be added by providing more dielectric layers having lower refractive indices.
Fig. 12 is a cross-sectional view of a display device 10d according to another embodiment of the present invention. The display device 10d is substantially the same as the display device 10a shown in fig. 7, except that the display device 10d further includes a dielectric layer 140a disposed between the composite cover plate 110a and the touch module 130. In other words, the dielectric layer 118a of the display device 10d has an interface 1182a and an interface 1184a facing and contacting the second board 114 and the first board 112, respectively, and the dielectric layer 140a has an interface 142a and an interface 144a facing and contacting the touch module 130 and the second board 114, respectively. As can be seen from the foregoing description of the technical efficacy of the display device 10, the difference in refractive index between the interface and the adjacent material increases, so that the reflected light is increased. Therefore, the display device 10d also has the technical effects of the display device 10, and the description thereof is omitted.
Fig. 13 is a cross-sectional view of a display device 10e according to another embodiment of the present invention. The display device 10e is substantially the same as the display device 10b shown in fig. 8, but the display device 10e further has a dielectric layer 150a located between the light guide plate 210 and the touch module 130. In other words, the dielectric layer 140a of the display device 10e has an interface 142a and an interface 144a facing and contacting the touch module 130 and the second plate 114, respectively. And the dielectric layer 150a has an interface 152a and an interface 154a facing and contacting the light guide plate 210 and the touch layer 134, respectively. As can be seen from the foregoing description of the technical efficacy of the display device 10, the difference in refractive index between the interface and the adjacent material increases, so that the reflected light is increased. Therefore, the display device 10e also has the technical effects of the display device 10, and the description thereof is omitted.
Fig. 14 is a cross-sectional view of a display device 10f according to another embodiment of the present invention. Display device 10f is substantially the same as display device 10e shown in fig. 13, except that display device 10f further has a dielectric layer 118a between first sheet 112 and second sheet 114. In other words, the display device 10f has three dielectric layers. The dielectric layer 118a of the display device 10f has an interface 1182a and an interface 1184a facing and contacting the second board 114 and the first board 112, respectively, the dielectric layer 140a of the display device 10f has an interface 142a and an interface 144a facing and contacting the touch module 130 and the second board 114, respectively, and the dielectric layer 150a of the display device 10f has an interface 152a and an interface 154a facing and contacting the light guide plate 210 and the touch layer 134, respectively. As can be seen from the foregoing description of the technical efficacy of the display device 10, the difference in refractive index between the interface and the adjacent material increases, so that the reflected light is increased. Therefore, the display device 10e also has the technical effects of the display device 10, and the description thereof is omitted.
Fig. 15 is a graph of refractive index simulation data for the display devices according to fig. 11, 12, 13 and 14. Fig. 15, columns 1 and 2 show the stack and the corresponding refractive index simulation data for the display device 10c of fig. 11. Fig. 15 shows a simulation of the stack and the corresponding refractive index of the display device 10d according to fig. 12 in columns 3 and 4. Fig. 15 shows, in columns 5 and 6, a stack of the display device 10e of fig. 13 and the corresponding refractive index simulation data. Fig. 15 shows a simulation of the stack and the corresponding refractive index of the display device 10f of fig. 14 in columns 7 and 8. The equivalent refractive index shown in the figure represents simulation data of the equivalent refractive index of each layer structure between the first plate 112 and the light guide plate 210. The simulated data for the equivalent refractive index of display device 10c is approximately 1.243. The analog data of the equivalent refractive index of the display device 10d is about 1.232. The analog data of the equivalent refractive index of the display device 10e is about 1.232. The analog data of the equivalent refractive index of the display device 10f is about 1.21. Therefore, the dielectric layer can replace the conventional optical adhesive layer (refractive index 1.474) to reduce the simulation data of the equivalent refractive index of each layer structure between the first plate 112 and the light guide plate 210. In other words, the dielectric layer can reduce the equivalent refractive index of the medium above the light guide plate 210, thereby enhancing the waveguide effect of the light guide plate 210. Therefore, the display device 10c, the display device 10d, the display device 10e and the display device 10f may have similar technical effects to the display device 10 shown in fig. 1, and are not described herein again. In addition, the display devices 10c, 10d and 10e have lower simulated equivalent refractive index data than the simulated equivalent refractive index data shown in fig. 10, which is consistent with the experimental data shown in fig. 9, i.e., the effect of reducing the optical contrast variation Δ CR can be superimposed. Similarly, the equivalent refractive index simulation data of the display device 10f is also lower than the equivalent refractive indices of the display devices 10c, 10d, and 10 e. Accordingly, the display device 10c, the display device 10d, the display device 10e and the display device 10f can have the technical effects of the display device 10 shown in fig. 1. In addition, the larger the number of dielectric layers, the effect of reducing the optical contrast variation Δ CR can be enhanced.
Fig. 16 is a cross-sectional view of a display device 10g according to another embodiment of the present invention. The display device 10g is substantially the same as the display device 10a of fig. 7, except that the dielectric layer 118b of the composite cover 110b of the display device 10g is an air layer (refractive index 1.0). In other words, the first plate 112 and the second plate 114 of the composite cover plate 110b are in contact with the air layer, respectively. As described above, since the difference in refractive index between dielectric layer 118b and first plate material 112 increases, the reflectivity of the surface of first plate material 112 facing dielectric layer 118b increases. Likewise, since the difference in refractive index between dielectric layer 118b and second sheet material 114 increases, the reflectivity of the surface of second sheet material 114 facing dielectric layer 118b increases.
Referring to fig. 6 and 9 together, the data in column 6 of fig. 6 represents the simulation calculation data of the display device 10g of fig. 16. The column 6 in fig. 9 shows experimental data obtained by the display device 10 g. As can be seen from the data of fig. 6 and 9, the waveguide effect of the light guide plate 210 is enhanced due to the low refractive index of the dielectric layer 118b of the display device 10 g. In addition, as can be seen from fig. 9, the optical contrast ratio CRON when the front light module 200 is turned on can be made larger than the optical contrast ratio CROFF when the front light module 200 is turned off by replacing the conventional optical adhesive layer with an air layer. In other words, the lower the refractive index of the dielectric layer used to replace the conventional optical adhesive layer, the lower the optical contrast variation Δ CR can be reduced, and the optical contrast CRON when the front light module 200 is turned on can be enhanced.
Fig. 17 is a cross-sectional view of a display device 10h according to another embodiment of the present invention. The display device 10h is substantially the same as the display device 10 of fig. 1, except that the display device 10h includes a dielectric layer 150b, and the dielectric layer 150b is an air layer (refractive index 1.0). In other words, the light guide plate 210 and the touch module 130 of the display device 10h are respectively in contact with the air layer. As described above, since the difference in refractive index between the dielectric layer 150b and the light guide plate 210 increases, the reflectivity of the surface of the light guide plate 210 facing the dielectric layer 150b increases. Likewise, as the refractive index difference between the dielectric layer 150b and the touch module 130 increases, the reflectivity of the surface to the surface of the dielectric layer 118b increases. As mentioned above, the dielectric layer 150b can reduce the equivalent refractive index of the medium above the light guide plate 210, thereby enhancing the waveguide effect of the light guide plate 210. The display device 10h also has the technical effects of the display device 10, and the description thereof is omitted.
Fig. 18 is experimental data of optical contrast and an amount of change in optical contrast according to the embodiment of fig. 17 and 19. Referring to fig. 18 and 9, column 3 of fig. 18 shows experimental data obtained from the display device 10 h. Comparing the data in the column 3 of fig. 18 with the data in the column 6 of fig. 9 (i.e., the experimental data of the display device 10 g), it can be seen that the closer the air layer is to the light guide plate 210, the greater the optical contrast CRON when the front light module 200 is turned on. In other words, the closer the dielectric layer with a lower refractive index is to the light guide plate 210, the stronger the waveguide effect is, and the optical contrast ratio CRON when the front light module 200 is turned on is higher than the optical contrast ratio CROFF when the front light module 200 is turned off, so the optical contrast variation Δ CR is a positive value.
It should be appreciated that in this embodiment, only the dielectric layer 150b is altered for clarity of comparison with the previous embodiments. Therefore, the result that the absolute value of the optical contrast variation Δ CR of the display device 10h is larger than the value of the optical contrast variation Δ CR of the known display device represents that the dielectric layer 150b has a better effect of increasing the optical contrast CRON when the front light module 200 is turned on.
In some embodiments, the display device may also be provided with other functional modules or functional film layers, such as a Colorless Polyimide (CPI) film and/or a water-blocking Coating (Barrier Coating) film applied to a foldable display panel. The functional module or functional film layer may comprise a material that increases the optical contrast variation Δ CR, such as a colorless polyimide film having a refractive index of about 1.6 and a water-blocking coating having a refractive index greater than 1.6. In this case, the optical contrast variation Δ CR of the display device can be adjusted to a value close to zero by the design of the air layer (see the dielectric layer 150b of fig. 17) shown in the display device 10 h. In other words, the design of the present embodiment does not need to remove the material with higher refractive index from the top of the light guide plate, but achieves the effect that the optical contrast variation Δ CR approaches to zero by disposing air above the light guide plate 210, so as to improve the experience of the user.
Fig. 19 is a cross-sectional view of a display device 10i according to another embodiment of the present invention. Referring to fig. 18 and 19, column 4 of fig. 18 shows experimental data obtained from the display device 10 i. The display device 10i is substantially the same as the display device 10 in fig. 1, except that the display device 10i does not have the touch module 130 (see fig. 1) located between the composite cover 110 and the front light module 200. In other words, the number of interfaces between the first plate 112 and the light guide plate 210 is reduced. Comparing the data in the 4 th column of fig. 18 with the data in the 3 rd column of fig. 9 (i.e., the experimental data of the conventional display device), it can be seen that the optical contrast CRON when the front-light module 200 of the present embodiment is turned on and the optical contrast CROFF when the front-light module 200 is turned off are both significantly increased, and the optical contrast variation Δ CR is lower than the optical contrast variation Δ CR (see fig. 9) of the conventional display device. Specifically, the number of stacked layers of the display device 10i is reduced, and the amount of reflection at the interface is reduced, so that the optical contrast CROFF when the front light module 200 is turned off can be reduced. In addition, since the electrode layer 132 in the touch module 130 (see fig. 1) has a high refractive index, the waveguide effect of the light guide plate 210 is not facilitated. Since the display device 10i does not have the electrode layer 132 between the composite cover plate 110 and the light guide plate 210, the optical contrast CRON when the front light module 200 is turned on can be increased.
Therefore, if the number of stacked structures between the light guide plate 210 and the first plate 112 is reduced, the optical contrast variation Δ CR can be reduced and the optical contrast CRON when the front light module 200 is turned on can be increased. In addition, avoiding the electrode layer with high refractive index between the composite cover plate 110 and the light guide plate 210 also reduces the equivalent refractive index of the medium above the light guide plate 210. In some embodiments, the touch module 130 (see fig. 1) or other functional modules may be disposed between the light guide plate 210 and the display panel 120, and the display device 10i may also be designed with the aforementioned dielectric layer (e.g., optical adhesive with a refractive index of 1.414). In other words, the present invention can adjust the stacked design and the refractive index of the medium layer to make the medium above the light guide plate 210 have a lower equivalent refractive index, thereby achieving the effect that the optical contrast variation Δ CR approaches to zero, so as to improve the situation experience of the user.
In summary, the present invention replaces the conventional optical adhesive layer (refractive index 1.474) with the dielectric layer having a refractive index greater than or equal to 1 and less than 1.474, so as to balance the optical contrast of the front light module when the front light module is in the on state and the off state respectively. In other words, the display device of the invention can reduce the optical contrast variation of the display device through the dielectric layer, so as to improve the situation experience of a user. In some embodiments, the display device of the invention can improve the optical contrast of the front light module when the front light module is turned on through the dielectric layer. In addition, the design of replacing the known optical adhesive layer with the dielectric layer does not increase the complexity of the whole stack structure of the display device, so the difficulty of adjusting the variation of the optical contrast is not increased, and the original mechanism design of the display device is not damaged.

Claims (15)

1. A functional assembly applied to a front light module of a display device is characterized by comprising:
the composite cover plate comprises a first plate and a second plate;
a reflective display panel, wherein the second sheet material is positioned between the first sheet material and the reflective display panel; and
and the at least one dielectric layer is positioned between the first plate of the composite cover plate and the reflective display panel, wherein the refractive index of the dielectric layer is greater than or equal to 1 and less than 1.474.
2. The functional assembly of claim 1, wherein the dielectric layer is positioned between the first sheet and the second sheet.
3. The functional assembly of claim 1, further comprising:
and the touch control module is positioned between the composite cover plate and the reflective display panel, wherein the dielectric layer is positioned between the composite cover plate and the touch control module or between the touch control module and the reflective display panel.
4. The functional assembly of claim 1, wherein the at least one dielectric layer is two in number, the display device further comprising a touch module positioned between the composite cover sheet and the reflective display panel, one of the two dielectric layers is positioned between the first sheet and the second sheet, and the other of the two dielectric layers is positioned between the second sheet and the touch module or between the touch module and the reflective display panel.
5. The functional assembly of claim 1, wherein the at least one dielectric layer is two in number, the display device further comprises a touch module positioned between the composite cover sheet and the reflective display panel, one of the two dielectric layers is positioned between the second sheet and the touch module, and the other of the two dielectric layers is positioned between the touch module and the reflective display panel.
6. The functional assembly of claim 1, further comprising:
and the touch control modules are positioned between the composite cover plate and the reflective display panel, the number of the dielectric layers is three, and the three dielectric layers are respectively positioned between the first plate and the second plate, between the touch control modules and the second plate and between the touch control modules and the reflective display panel.
7. A display device, comprising:
a front light module including a light guide plate and a light source; and
a functional assembly comprising:
the composite cover plate comprises a first plate and a second plate;
the front light module is positioned between the composite cover plate and the reflective display panel; and
and the at least one dielectric layer is positioned between the first plate of the composite cover plate and the light guide plate, wherein the refractive index of the dielectric layer is greater than or equal to 1 and less than 1.474.
8. The display device of claim 7, wherein the dielectric layer is between the first sheet and the second sheet.
9. The display device of claim 7, further comprising:
and the touch module is positioned between the composite cover plate and the light guide plate, wherein the dielectric layer is positioned between the composite cover plate and the touch module or between the touch module and the light guide plate.
10. The display device according to claim 7, wherein the number of the at least one dielectric layer is two, the display device further comprises a touch module located between the composite cover plate and the light guide plate, one of the two dielectric layers is located between the first plate and the second plate, and the other of the two dielectric layers is located between the second plate and the touch module or between the touch module and the light guide plate.
11. The display device according to claim 7, wherein the number of the at least one dielectric layer is two, the display device further comprises a touch module located between the composite cover plate and the light guide plate, one of the two dielectric layers is located between the second plate and the touch module, and the other of the two dielectric layers is located between the touch module and the light guide plate.
12. The display device of claim 7, further comprising:
and the touch control modules are positioned between the composite cover plate and the light guide plate, the number of the medium layers is three, and the three medium layers are respectively positioned between the first plate and the second plate, between the touch control modules and the second plate and between the touch control modules and the light guide plate.
13. The display device of claim 7, wherein the dielectric layer is a layer of air.
14. The display device according to claim 13, wherein the air layer is located between the first plate and the second plate of the composite cover.
15. The display device of claim 13, further comprising:
and the touch module is positioned between the composite cover plate and the light guide plate, wherein the air layer is positioned between the touch module and the light guide plate.
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CN110346859A (en) * 2018-04-08 2019-10-18 京东方科技集团股份有限公司 Optical resonator, display panel
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