CN117805962A - Light guide assembly and display device - Google Patents
Light guide assembly and display device Download PDFInfo
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- CN117805962A CN117805962A CN202211168028.7A CN202211168028A CN117805962A CN 117805962 A CN117805962 A CN 117805962A CN 202211168028 A CN202211168028 A CN 202211168028A CN 117805962 A CN117805962 A CN 117805962A
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- light guide
- layer
- coating layer
- guide plate
- refractive index
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- 239000010410 layer Substances 0.000 claims abstract description 121
- 239000000463 material Substances 0.000 claims abstract description 83
- 239000011247 coating layer Substances 0.000 claims abstract description 61
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000007747 plating Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 150000002484 inorganic compounds Chemical class 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- -1 tiN) Chemical class 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000001015 X-ray lithography Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- Planar Illumination Modules (AREA)
Abstract
The invention provides a light guide assembly and a display device. The light guide assembly comprises a light guide plate, a first coating layer, a second coating layer and an optical regulation layer. The light guide plate is provided with a first surface and a second surface which are away from each other, wherein one surface is provided with a microstructure. The first coating layer is arranged on the first surface, and the second coating layer is arranged on the second surface. The optical regulation layer is arranged on the first coating layer and comprises a plurality of first material layers and second material layers which are mutually stacked, wherein the refractive index of the first material layer is different from that of the second material layer. Therefore, the light emitting effect can be improved.
Description
Technical Field
The disclosure relates to a light guide assembly and a front light type display device using the same.
Background
The front-light display device refers to a display side (not a back side) of a display panel, and generally includes a reflective display panel and a light guide plate, wherein the light guide plate guides light to the reflective display panel, and the light is reflected to a viewer. In order to form precise and fine microstructures on the surface of the light guide plate, the light guide plate is generally prepared by adopting a nano-imprinting or hot-imprinting mode, the uniform light emitting effect at the top of the light guide plate is achieved by changing the shape and the size of the microstructures, the conventional microstructure patterns are not just concave points or convex points, the appearance shapes of the microstructures are more common in circular, V-shaped, triangular and the like, but the embossing module is high in cost and difficult to process due to the special patterns and the special shapes of the microstructures and the heights of the microstructures which are only between a few micrometers and hundreds of micrometers. In addition, when the light source emits the light guide plate, some light is directly emitted to the outside (not emitted to the reflective display panel), and the light emitting effect is reduced.
Disclosure of Invention
The embodiment of the disclosure provides a light guide assembly, which comprises a light guide plate, a first coating layer, a second coating layer and an optical regulation layer. The light guide plate is provided with a first surface and a second surface which are away from each other, one of the first surface and the second surface is provided with a microstructure, and the microstructure is provided with an apex which is away from the first surface and the second surface at the same time. The first coating layer is arranged on the first surface of the light guide plate. The second coating layer is arranged on the second surface of the light guide plate. The optical regulation layer is arranged on the first coating layer, wherein the first coating layer is arranged between the light guide plate and the optical regulation layer, and the optical regulation layer comprises a plurality of first material layers and second material layers which are mutually stacked, and the refractive index of the first material layers is different from that of the second material layers.
In some embodiments, the microstructures are disposed on the first surface, and the thickness of the first plating layer is greater than the height of the apex.
In some embodiments, the microstructures are disposed on the second surface, and the thickness of the second coating layer is greater than the height of the vertex.
In some embodiments, the second material layer is disposed between the first material layer and the first coating layer, and the refractive index of the second material layer is greater than the refractive index of the first coating layer.
In some embodiments, the refractive index of the first material layer is less than the refractive index of the second material layer.
In some embodiments, the refractive index of the first material layer is smaller than the refractive index of the second material layer, wherein one of the second material layers contacts the first coating layer, and one of the first material layers forms the light emitting surface.
In some embodiments, the thickness of the optical modulating layer is an integer multiple of 1/4λ, and the number of layers of the first material layer and the second material layer that are alternately stacked is an even multiple, where λ is the target wavelength.
In another aspect, embodiments of the present disclosure provide a display device including a reflective display panel and a light guide assembly. The reflective display panel has a display side and a back side facing away from each other. The light guide assembly is arranged on the display side of the reflective display panel and comprises a light guide plate, a first coating layer, a second coating layer and an optical regulation layer. The light guide plate is provided with a first surface and a second surface which are away from each other, wherein the second surface is opposite to the reflective display panel, and one of the first surface and the second surface is provided with a microstructure. The first coating layer is arranged on the first surface of the light guide plate. The second coating layer is arranged on the second surface of the light guide plate. The optical regulation layer is arranged on the first coating layer, wherein the first coating layer is arranged between the light guide plate and the optical regulation layer, and the optical regulation layer comprises a plurality of first material layers and second material layers which are mutually stacked, and the refractive index of the first material layers is different from that of the second material layers.
In some embodiments, the display device further includes a light emitting element disposed on a third surface of the light guide plate, and the third surface connects the first surface and the second surface.
In some embodiments, the optical adjusting layer is disposed at the outermost side of the display device to be used as an appearance element of the display device.
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram illustrating a display device according to an embodiment;
FIG. 2 is a schematic diagram of an optical path of an optical modulation layer and a light guide plate according to an embodiment;
FIG. 3 is a schematic diagram illustrating a display device according to an embodiment;
FIG. 4 is a schematic diagram illustrating a display device according to an embodiment;
FIGS. 5-7 are schematic diagrams illustrating a display device having a protective cover according to an embodiment;
fig. 8 is a side view schematic diagram illustrating a microstructure 132 according to some embodiments.
[ symbolic description ]
100 display device
110 reflective display panel
111 display side
112 back side
120 luminous element
130 light guide assembly
131 light guide plate
131a first surface
131b second surface
131c third surface
132 microstructure
133 coating layer
134 coating layer
135a first material layer
135b second material layer
135 optical modulating layer
141 vertex point
t is thickness
210 light-emitting surface
301 microstructure
302 vertex point
501 protective cover plate
502 adhesive glue
Detailed Description
The terms "first," "second," and the like, as used herein, do not denote a particular order or sequence, but rather are merely used to distinguish one element or operation from another in the same technical term.
Fig. 1 is a schematic diagram illustrating a display device according to an embodiment. Referring to fig. 1, a display device 100 includes a reflective display panel 110, a light emitting element 120, and a light guiding element 130. The reflective display panel 110 has a display side 111 and a back side 112 facing away from each other, and the reflective display panel 110 is provided with a reflective structure (not shown) for reflecting light incident on the display side 111. In some embodiments, an adhesive may be disposed between the reflective display panel 110 and the light guide assembly 130.
The light guide assembly 130 is disposed on the display side 111 of the reflective display panel 110. The light guide assembly 130 includes a light guide plate 131, a coating layer 133, a coating layer 134, and an optical adjustment layer 135. The light guide plate 131 has a first surface 131a and a second surface 131b facing away from each other, and a third surface 131c connected to the first surface 131a and the second surface 131b. The light emitting element 120 is disposed on the third surface 130c, and the light emitting element 120 is, for example, a light emitting diode. The second surface 131b faces the reflective display panel 110, and the second surface 131b is provided with microstructures 132, and the microstructures 132 protrude outwards from the second surface 131b, that is, the peaks 141 of the microstructures 132 face away from both the first surface 131a and the second surface 131b. The coating layer 133 is disposed on the second surface 131b, and the coating layer 133 covers the microstructure 132 and the vertex 141 of the microstructure 132. In addition, in other embodiments, the thickness t of the coating layer 133 may be greater than the height of the vertex 141 relative to the second surface 131b, but not limited thereto. On the other hand, the coating layer 134 is formed on the first surface 131a, the optical adjustment layer 135 is disposed on the coating layer 134, and the coating layer 134 is disposed between the light guide plate 131 and the optical adjustment layer 135. The coating layers 133 and 134 can provide a hard surface for protecting the light guide plate 131. The optical adjustment layer 135 includes a first material layer 135a and a second material layer 135b, wherein the refractive index of the first material layer 135a is different from the refractive index of the second material layer 135 b. For simplicity, only one first material layer 135a and one second material layer 135b are shown in fig. 1, but in some embodiments multiple first material layers 135a and multiple second material layers 135b may be provided, where the first material layers 135a and the second material layers 135b are stacked alternately with each other.
In the embodiment of fig. 1, the microstructures 132 are convex semi-circular, but in other embodiments may be convex triangular or any shape. In addition, the microstructures 132 may also extend along a certain direction or be distributed on a two-dimensional plane, and the disclosure is not limited to the shape and the distribution of the microstructures 132. For example, the microstructures 132 may have a predetermined gap therebetween, and the predetermined gap may be changed according to the requirement of the user to adjust the microstructures 132 to be distributed in a denser or more sparse manner. In some embodiments, microstructures 132 may have areas of different distribution densities in a two-dimensional plane, such as areas of higher density in the center of the two-dimensional plane and areas of lower density around the center.
FIG. 2 is a schematic diagram of an optical path of an optical modulation layer and a light guide plate according to an embodiment. Referring to fig. 2, for simplicity, the microstructure 132 and the plating layer 133 are not shown in fig. 2. In this embodiment, there are two first material layers 135a and two second material layers 135b, wherein the second material layer 135b at the lowest layer contacts the coating layer 134 and is disposed between the first material layer 135a and the coating layer 134, and the first material layer 135a at the uppermost layer forms the light-emitting surface 210. The refractive index of the second material layer 135b is greater than the refractive index of the plating layer 134, and the refractive index of the first material layer 135a is less than the refractive index of the second material layer 135 b. The light emitting device 120 provides light from the side of the light guide plate 131, when the light is emitted from the inside of the light guide plate 131 to the coating layer 134, if the incident angle θ is smaller than a critical angle θ C Some of the light is emitted from the light-emitting surface 210, and some of the light is reflected back to the light-guiding plate 131 and then directed to the reflective display panel 110. On the other hand, if the incident angle θ is greater than the critical angle θ C The light is totally reflected back to the light guide plate 131 and then directed to the reflective display panel 110. The reflective display panel 110 is provided with a polarizer, a display medium (e.g. liquid crystal), a pixel electrode, a common electrode, and the like, and the light reflected by the reflective display panel 110 is emitted upward through the light-emitting surface 210 by the light-guiding plate 131. In this embodiment, since the optical adjustment layer 135 is disposed, the light rays passing through the reflective portions of the first material layer 135a and the second material layer 135b with different refractive indexes can be recovered, which is helpful for increasing the light rays entering the light guide plate 131 from the light emitting element 120 and directly emitted upwardsAdding the effect of the light reflected to the reflective display panel 110. The optical modulation layer 135 is not provided in the prior art, when the incident angle θ is smaller than the critical angle θ C Most of the light is directly emitted outward and cannot be emitted to the reflective display panel 110, so that the reflective display panel 110 provides a poor display effect.
In order to achieve better optical effect, the thickness of the optical modulation layer 135 isLambda, e.g. the thickness of the first material layer 135a and the second material layer 135b are all +.>λ, where λ is a target wavelength, that is, a wavelength of light emitted by the light emitting element 120, and n is a positive integer. In addition, the number of layers of the first material layer 135a and the second material layer 135b stacked alternately is an even multiple (4 layers in the embodiment of fig. 2).
Referring to fig. 1, the material of the light guide plate 131 may include Polycarbonate (PC), polyacrylic acid (PMMA), or other suitable materials. The materials of the coating layers 133 and 134 may comprise a suitable resin material or an inorganic compound, wherein the inorganic compound has a good water-blocking ability, and for example, the inorganic compound comprises a metal oxide (e.g., al 2 O 3 /Ti 3 O 5 ) Silicon dioxide (SiO) 2 ) Silicon nitride (e.g. SiN) x ) And metal nitrides (e.g., tiN), etc. In some embodiments, the thickness of the plating layer 133 and the plating layer 134 is up to 200nm or more. In some embodiments, the difference between the thermal expansion coefficient of the coating layer 133 (or the coating layer 134) and the thermal expansion coefficient of the light guide plate 131 is smaller than a critical value, so as to avoid the problem of cracking due to thermal expansion. For example, the material of the light guide plate 131 includes polycarbonate with a thermal expansion coefficient of 6.8x10 -5 Per DEG C, and the material of the coating layer 133 (or the coating layer 134) comprises silicon dioxide, the thermal expansion coefficient is 5.0x10 -5 At about 1.8x10 difference -5 And therefore the critical value must be greater than 1.8x10 -5 and/C to resist thermal deformation. In one placeIn some embodiments, the coating 133 and the coating 134 also include stacking more than one layer of material. For example, the coating layer 133 (or the coating layer 134) includes two layers of film hardening materials, and the first layer of film hardening material of the coating layer 133 (or the coating layer 134) is silicon dioxide (refractive index=1.46, thermal expansion coefficient=5.0x10 -5 /(deg.C). A second film hardening material, such as NaF (refractive index=1.3, thermal expansion coefficient=3.9x10), is stacked on the first film hardening material of the plating layer 133 (or the plating layer 134) -5 /(deg.C). In addition, the first material layer 135a and the second material layer 135b may include metal compounds (such as MgF 2 、NdF 3 、CeF 3 Etc.) and oxides (e.g. SiO 2 、Al 2 O 3 、TiO 2 Etc.). For example, the first material layer 135a may be MgF 2 A refractive index of 1.38; the second material layer 135b may be TiO 3 The refractive index was 2.04.
The microstructures 132 are formed on the second surface 131b in the embodiment of fig. 1, but may be formed on the first surface 131a or on both surfaces in other embodiments. For example, in the embodiment of fig. 3, the microstructures 301 are formed on the first surface 131a of the light guide plate 131. The vertex 302 of the microstructure 301 is far away from the first surface 131a and the second surface 131b, the coating layer 134 is disposed on the first surface 131a, and the coating layer 134 covers the microstructure 301 and the vertex 302 of the microstructure 301. In addition, in other embodiments, the thickness t of the coating layer 134 may be greater than the height of the vertex 302 relative to the first surface 131a, but not limited thereto. In the embodiment of fig. 4, microstructures 301 are disposed on the first surface 131a, while microstructures 132 are disposed on the second surface 131b. Coating 134 covers microstructure 301 and coating 133 covers microstructure 132. The cross-sectional shapes of the microstructures 301 and 132 in fig. 3 and 4 are merely examples, and the disclosure is not limited to the shapes and distributions of the microstructures 301 and 132. For example, similar to the microstructures 132, the microstructures 301 may extend along a certain direction or be distributed on a two-dimensional plane. For another example, the microstructures 301 may have a predetermined gap therebetween, and the predetermined gap may be changed according to the requirement of the user to adjust the microstructures 301 to be distributed in a denser or more sparse manner. In some embodiments, microstructures 301 may have areas of different distribution densities in a two-dimensional plane, e.g., areas of higher density in the center of the two-dimensional plane and areas of lower density around the center.
In the embodiments of fig. 1, 3 and 4, the optical adjustment layer 135 is disposed at the outermost side of the display device 100 to be used as an external appearance element of the display device 100, that is, no additional protective cover (cover lens) is required. The coating layer 134 has functions of improving the surface hardness of the light guide assembly, making the microstructure scratch-resistant, blocking moisture and oxygen, and avoiding warping of the light guide plate. However, in other embodiments, a protective cover may be additionally disposed, as shown in fig. 5 to 7, where the display device further includes a protective cover 501, the protective cover 501 is disposed over the optical adjustment layer 135, and an adhesive 502 may be disposed between the protective cover 501 and the optical adjustment layer 135.
Fig. 8 is a side view schematic diagram illustrating a microstructure 132 according to some embodiments. In the embodiment of the present invention, the shape of the microstructure 132 may be triangle, ellipse or trapezoid besides the semicircle, wherein the right-most microstructure cross-section shape is based on trapezoid and the shape is arc. In addition, in order to enhance the optical performance of the light guide plate 131, cross-shaped or m-shaped scores may be formed on the semicircular microstructures 132.
Similarly, the shape of the microstructure shown in fig. 8 can be applied to the microstructure 301. Specifically, in the embodiment of the present invention, the shape of the microstructure 301 may be a semicircle, an ellipse or a trapezoid, in addition to the triangle. In some embodiments, the microstructures 132 and 301 can be formed on the light guide plate 131 using techniques such as photolithography, X-ray lithography, laser etching, or screen printing.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, but rather is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (10)
1. A light guide assembly, comprising:
the light guide plate is provided with a first surface and a second surface which are away from each other, one of the first surface and the second surface is provided with a microstructure, and the microstructure is provided with an apex which is away from the first surface and the second surface at the same time;
the first coating layer is arranged on the first surface of the light guide plate;
the second coating layer is arranged on the second surface of the light guide plate; and
the optical regulation and control layer is arranged on the first coating layer, wherein the first coating layer is arranged between the light guide plate and the optical regulation and control layer, and the optical regulation and control layer comprises a plurality of first material layers and second material layers which are mutually stacked, wherein the refractive index of the first material layers is different from that of the second material layers.
2. The light guide assembly of claim 1, wherein the microstructure is disposed on the first surface, and the thickness of the first coating layer is greater than the height of the apex.
3. The light guide assembly of claim 1, wherein the microstructure is disposed on the second surface, and the thickness of the second coating layer is greater than the height of the apex.
4. The light guide assembly of claim 1, wherein the second material layer is disposed between the first material layer and the first coating layer, the second material layer having a refractive index greater than a refractive index of the first coating layer.
5. A light guide assembly as recited in claim 4, wherein a refractive index of the first material layer is less than a refractive index of the second material layer.
6. The light guide assembly of claim 1, wherein the first material layer has a refractive index less than a refractive index of the second material layer, one of the second material layers contacts the first coating layer, and one of the first material layers forms the light exit surface.
7. The light guide assembly of claim 1, wherein the optical modulating layer has a thickness that is an integer multiple of 1/4 λ, and the first material layer and the second material layer are stacked alternately an even multiple of the number of layers, where λ is a target wavelength.
8. A display device, comprising:
a reflective display panel having a display side and a back side facing away from each other;
the light guide component is arranged on the display side of the reflective display panel, and comprises:
the light guide plate is provided with a first surface and a second surface which are away from each other, wherein the second surface is opposite to the reflective display panel, and one of the first surface and the second surface is provided with a microstructure;
the first coating layer is arranged on the first surface of the light guide plate;
the second coating layer is arranged on the second surface of the light guide plate; and
the optical regulation and control layer is arranged on the first coating layer, wherein the first coating layer is arranged between the light guide plate and the optical regulation and control layer, and the optical regulation and control layer comprises a plurality of first material layers and second material layers which are mutually stacked, wherein the refractive index of the first material layers is different from that of the second material layers.
9. The display device of claim 8, further comprising at least one light emitting element disposed on a third surface of the light guide plate, the third surface connecting the first surface and the second surface.
10. The display device according to claim 8, wherein the optical adjustment layer is provided at an outermost side of the display device as an exterior element of the display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211168028.7A CN117805962A (en) | 2022-09-23 | 2022-09-23 | Light guide assembly and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211168028.7A CN117805962A (en) | 2022-09-23 | 2022-09-23 | Light guide assembly and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117805962A true CN117805962A (en) | 2024-04-02 |
Family
ID=90427507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211168028.7A Pending CN117805962A (en) | 2022-09-23 | 2022-09-23 | Light guide assembly and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117805962A (en) |
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2022
- 2022-09-23 CN CN202211168028.7A patent/CN117805962A/en active Pending
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