CN111538182B - Display device - Google Patents
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- CN111538182B CN111538182B CN202010418151.4A CN202010418151A CN111538182B CN 111538182 B CN111538182 B CN 111538182B CN 202010418151 A CN202010418151 A CN 202010418151A CN 111538182 B CN111538182 B CN 111538182B
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- 239000000758 substrate Substances 0.000 claims abstract description 153
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 239000003086 colorant Substances 0.000 claims description 20
- 239000004973 liquid crystal related substance Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 10
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a display device, comprising: the first display panel is positioned on the second display panel at the light-emitting side of the first display panel; the side of the first display panel facing the second display panel and the side of the second display panel facing the first display panel both comprise substrates, at least one substrate is provided with a microstructure, and the fixed optical path difference formed by the light between the two substrates is destroyed by utilizing the modulation effect of the microstructure on the optical path of the incident light, so that the interference between the light is avoided, and the generation of rainbow patterns on the display surface is inhibited.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
A Liquid Crystal Display (LCD) has the advantages of high image quality, power saving, thin body, and wide application range, and is still dominant in the Display field. The traditional liquid crystal display has great advantages in the aspect of white field brightness by adopting a mode of matching a backlight source with a liquid crystal display panel, but has defects in the aspects of visual angle and black field expression.
In order to make up for the defects of the liquid crystal display, a display scheme of a double-layer display module is provided, wherein a lower layer display module is used as the backlight of an upper layer display module and can achieve pixel-level light control; the upper display module is used for displaying images, and the double-layer display module is turned off, so that the black field brightness is greatly reduced.
However, due to the regularity between the two display modules, when light exits from the lower display module to the upper display module, a fixed optical path difference exists between the transmitted light generated by the upper display module and the reflected transmitted light, so that interference occurs between the light, rainbow fringes appear subjectively on the display, and the image display effect is affected.
Disclosure of Invention
In some embodiments of the present invention, at least one of the first display panel and the second display panel is provided with a microstructure, and a fixed optical path difference formed between the two substrates by light is destroyed by using a modulation effect of the microstructure on an optical path of incident light, so as to avoid interference between light and inhibit a display surface from generating rainbow fringes.
In some embodiments of the present invention, the microstructures are disposed corresponding to the sub-pixel units, the wavelengths of the emergent light of the sub-pixel units with different colors are different, and the microstructures are disposed for the sub-pixel units, so that the microstructures can suppress interference fringes for the emergent light with different wavelengths.
In some embodiments of the present invention, the microstructure is a dot-shaped protrusion structure located on the surface of the substrate, and the dot-shaped protrusion structure is disposed on the surface of the substrate, so that the distance between the first upper substrate and the second lower substrate is no longer a fixed distance, and the optical path difference between the originally interfered light rays no longer satisfies the interference condition, thereby eliminating the rainbow streak phenomenon on the display surface.
In some embodiments of the invention, the dot-shaped convex structures and the sub-pixel units are arranged in one-to-one correspondence, so that a proper projection degree can be set for the wavelength of each sub-pixel unit, and thus emergent light of the sub-pixel units with different colors can destroy the interference condition of light, and rainbow fringes are eliminated.
In some embodiments of the present invention, the microstructure is a columnar protruding structure located on the surface of the substrate, and the columnar protruding structure is disposed on the surface of the substrate, so that the distance between the first upper substrate and the second lower substrate is no longer a fixed distance, and the optical path difference between the originally interfered light rays no longer satisfies the interference condition, thereby eliminating the rainbow texture phenomenon of the display surface.
In some embodiments of the invention, the columnar protruding structures are arranged in one-to-one correspondence with the sub-pixel unit columns containing the sub-pixel units with the same color, so that a proper protruding degree can be set for the wavelength of each column of sub-pixel units, and thus, emergent light of the sub-pixel units with different colors can destroy the interference condition of light, and rainbow patterns are eliminated.
In some embodiments of the present invention, the radius of curvature of the microstructure s satisfies:
wherein, R represents the curvature radius of the microstructure, d represents the vertical distance between the first upper substrate and the second lower substrate, a represents the width of the sub-pixel unit, and λ represents the wavelength of the emergent light of the sub-pixel unit.
In some embodiments of the present invention, the refractive index of the microstructure is the same as the refractive index of the substrate, thereby simplifying the complexity of design and calculation.
In some embodiments of the present invention, the microstructures are made using resin.
In some embodiments of the present invention, the first display panel and the second display panel are liquid crystal display panels; the display device further includes: and the backlight module is positioned on one side of the first display panel, which is deviated from the second display panel.
In some embodiments of the present invention, the first display panel is an organic light emitting diode display panel; the second display panel is a liquid crystal display panel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an optical path provided by an embodiment of the present invention;
FIG. 3 is a second schematic diagram of the optical path provided by the embodiment of the present invention;
FIG. 4 is a top view of a substrate according to an embodiment of the present invention;
fig. 5 is a second schematic cross-sectional view illustrating a display device according to an embodiment of the invention;
fig. 6 is a third schematic cross-sectional view illustrating a display device according to an embodiment of the invention;
FIG. 7 is a third schematic diagram of an optical path according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating an arrangement structure of sub-pixel units according to an embodiment of the present invention;
FIG. 9 is a second top view of the substrate according to the present invention;
FIG. 10 is a fourth schematic cross-sectional view of a display device according to an embodiment of the present invention;
fig. 11 is a fifth schematic cross-sectional view of a display device according to an embodiment of the invention.
The display panel comprises a substrate, a first display panel, a second display panel, a backlight module, a first lower substrate, a first upper substrate, a first sub-pixel unit, a second lower substrate, a second upper substrate, a second sub-pixel unit and an s-microstructure, wherein the substrate comprises 100 parts of the first display panel, 200 parts of the second display panel, 300 parts of the backlight module, 11 parts of the first lower substrate, 12 parts of the first upper substrate, 13 parts of the first sub-pixel unit, 21 parts of the second lower substrate, 22 parts of the second upper substrate, 23 parts of the second sub-pixel unit and s-microstructures.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
The LCD has the advantages of high image quality, power saving, thin body, wide application and application range, and the like, and currently, the LCD still occupies a dominant position in the display field.
The LCD display principle is that liquid crystal is set between two pieces of conducting glass and driven by the electric field between two electrodes to produce the electric field effect of liquid crystal molecule distortion to control the transmission or shielding function of the back light source and display the image. If a color filter is added, a color image can be displayed.
The traditional liquid crystal display has great advantages in the aspect of white field brightness by adopting a mode of matching a backlight source with a liquid crystal display panel, but has defects in the aspects of visual angle and black field expression.
In order to make up for the defects of the liquid crystal display, a display scheme of a double-layer display module is provided, wherein a lower layer display module is used as the backlight of an upper layer display module and can achieve pixel-level light control; the upper display module is used for displaying images, and the double-layer display module is turned off, so that the black field brightness is greatly reduced.
Fig. 1 is a schematic cross-sectional view of an embodiment of the invention.
Referring to fig. 1, a display device according to an embodiment of the present invention includes: a first display panel 100 and a second display panel 200 which are stacked.
The first display panel 100 is located on a side of the display device facing away from the display surface, and the second display panel 200 is located on the side of the display surface of the display device.
The first display panel 100 and the second display panel 200 are the same in size and shape. In general, the first display panel 100 and the second display panel 200 may be configured in a rectangular shape including a day side, a ground side, a left side, and a right side, wherein the day side and the ground side are opposite, the left side and the right side are opposite, the day side is connected to one end of the left side and one side of the right side, respectively, and the ground side is connected to the other end of the left side and the other end of the right side, respectively.
The first display panel 100 serves to modulate light incident to the second display panel 200, and the second display panel 200 serves to display an image.
The first display panel 100 is used as the backlight of the second display panel 200, and can divide the backlight into more partitions to achieve pixel-level light control, and accordingly adjust the brightness of the backlight in each partition according to the needs of a display screen when displaying an image, thereby achieving the purposes of saving energy and enhancing image quality.
The second display panel 200 is a transmissive display panel, which can modulate the transmittance of light, but does not emit light by itself. The second display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of light incident to the pixel unit, so that the light transmitted by all the pixel units forms a displayed image.
When the display device is in black field display, the dual first display panel 100 and the dual second display panel 200 are turned off simultaneously, which greatly reduces the black field brightness from the previous 0.1nits to 0.004 nits.
The first display panel 100 serves to modulate light incident to the second display panel 200, and thus the resolution of the first display panel 100 may be relatively small. The second display panel 200 is used for image display, and the image resolution of the display device is the same as the resolution of the second display panel 200, so the resolution of the second display panel 200 can be relatively large. The resolution of the first display panel 100 may be less than or equal to the resolution of the second display panel 200.
In the embodiment of the invention, a side of the first display panel 100 facing the second display panel 200 and a side of the second display panel 200 facing the first display panel 100 both include a substrate. The first display panel 100 and the second display panel 200 each include a sub-pixel unit.
Referring to fig. 1, the first display panel 100 includes: a first lower substrate 11, a first upper substrate 12, and a first sub-pixel unit 13 between the first lower substrate 11 and the first upper substrate 12.
The first lower substrate 11 and the first upper substrate 12 are disposed opposite to each other, and the first upper substrate 12 is a substrate on a side of the first display panel 100 facing the second display panel 200.
The shapes of the first lower substrate 11 and the first upper substrate 12 are adapted to the shape of the display device, and the display devices currently used in the fields of televisions, mobile terminals, and the like are all rectangular, and accordingly, the first lower substrate 11 and the first upper substrate 12 may be rectangular. The first lower substrate 11 and the first upper substrate 12 are made of glass or the like.
The first lower substrate 11 has a driving circuit formed thereon, the first sub-pixel unit 13 is electrically connected to the driving circuit, and the light emitting luminance of the first sub-pixel unit 13 can be controlled by controlling a driving signal of the driving circuit.
The second display panel 200 includes: a second lower substrate 21, a second upper substrate 22, and a second sub-pixel unit 23 located between the second lower substrate 21 and the second upper substrate 22.
The second lower substrate 21 and the second upper substrate 22 are disposed opposite to each other, and the second lower substrate 21 is a substrate on a side of the second display panel 200 facing the first display panel 100.
The shapes of the second lower substrate 21 and the second upper substrate 22 are adapted to the shape of the display device, the display devices currently used in the fields of televisions, mobile terminals, and the like are all rectangular, and accordingly, the second lower substrate 21 and the second upper substrate 22 may also be rectangular. The second lower substrate 21 and the second upper substrate 22 are made of glass or the like.
The second lower substrate 21 has a driving circuit formed thereon, the second sub-pixel unit 23 is electrically connected to the driving circuit, and the light emitting luminance of the second sub-pixel unit 23 can be controlled by controlling the driving signal of the driving circuit.
Fig. 2 is one of the optical path schematic diagrams provided by the embodiment of the present invention.
Referring to fig. 2, in the display device provided in the embodiment of the present invention, the first display panel 100 and the second display panel 200 are separated by a fixed distance, and thus the first upper substrate 12 and the second lower substrate 21 have a fixed vertical distance therebetween.
When the first display panel emitting light ray a1 passes through the first upper substrate 12 and emits to the second lower substrate 21, a transmission light ray a2 and a reflection light ray a3 are formed; the reflected light ray a3 is incident again to the first upper substrate 12 and is reflected on the surface of the first upper substrate 12 to form a reflected light ray a 4; the reflected light ray a4 is incident on the second lower substrate 21 to form a transmitted light ray a5, and interference occurs due to a fixed optical path difference between the transmitted light ray a2 and the transmitted light ray a 5. The light emitted from the first display panel 100 to the second display panel 200 will generate the interference phenomenon, and finally rainbow stripes will be formed on the light-emitting side of the display device, which affects the image display effect.
The principle of the bright and dark stripes of the rainbow patterns formed is explained below. Fig. 3 is a second schematic diagram of the optical path provided by the embodiment of the invention.
The light ray a2 is a refracted light ray formed by the light ray emitted from the first display panel 100 to the second display panel 200, and the light ray a5 is a secondary refracted light ray finally formed by the light ray a2 through the reflection of the first upper substrate 12 and the second lower substrate 21. The light ray a2 and the light ray a5 are coherent to form a stripe with uneven brightness and darkness, which is determined by the optical path difference between the two.
Referring to fig. 3, the optical path difference between the light ray a2 and the light ray a5 is:
δ＝n2*(AB+BC)-n1*AC′-λ/2；
wherein:
n1*AC′＝n1*AC*sin(i)＝2*n2*d*(1-cos2(i′))/cos(i′)；
so that:
namely:
where n1 and n2 represent the refractive indices of the different media, and d represents the thickness of the medium with refractive index n 2.
As can be seen from the above formula, when the optical path difference between the light ray a2 and the light ray a5 is (2 × j +1) × λ/2, interference bright fringes are generated, and when the optical path difference between the light ray a2 and the light ray a5 is (2 × j) × λ/2, interference dark fringes are generated.
In order to eliminate the rainbow texture phenomenon generated on the display surface, referring to fig. 1, in the embodiment of the present invention, a microstructure s is disposed on at least one of the first upper substrate 12 and the second lower substrate 21, and a fixed optical path difference formed between the first upper substrate 12 and the second lower substrate 21 by light is destroyed by using a modulation effect of the microstructure s on an optical path of incident light, so as to avoid interference between light and suppress the generation of rainbow texture on the display surface.
In the display device provided by the embodiment of the invention, the sub-pixel units have different colors, and the wavelengths of the emergent light rays of the sub-pixel units with different colors are different. According to the formula, the optical path difference of the emergent light rays with different colors is related to the wavelength of the emergent light rays, so that in the embodiment of the invention, the microstructures s are respectively arranged aiming at the sub-pixel units, and the effect of inhibiting interference fringes on the emergent light rays of the sub-pixel units with different colors can be achieved, so that the image display effect of the display device is optimized.
Fig. 4 is a top view of a substrate according to an embodiment of the invention.
Referring to fig. 1 and 4, in the embodiment of the present invention, the microstructures s may be disposed as dot-shaped protruding structures on the surface of the substrate, where the dot-shaped protruding structures correspond to the sub-pixel units in the display panel to which the substrate belongs one to one. The point-shaped convex structure is a structure with a cambered surface protruding from the surface.
Referring to fig. 1, in the embodiment of the invention, the dot-shaped protruding structures(s) are disposed on the surface of the first upper substrate 12 facing the second lower substrate 21, and protrude toward the second lower substrate 21.
In addition, fig. 5 is a second schematic cross-sectional structure diagram of the display device according to the embodiment of the invention, and fig. 6 is a third schematic cross-sectional structure diagram of the display device according to the embodiment of the invention. Referring to fig. 5, the dot-shaped protrusion structures(s) may also be disposed on a surface of the second lower substrate 21 facing the first upper substrate 12; alternatively, referring to fig. 6, dot-shaped protrusion structures(s) are provided on both the surface of the first upper substrate 12 facing the second lower substrate 21 and the surface of the second lower substrate 21 facing the first upper substrate 12.
The dot-shaped convex structures(s) are arranged on the surface of the substrate, so that the distance between the first upper substrate 12 and the second lower substrate 21 is no longer a fixed distance, and the optical path difference between the originally interfered light rays no longer meets the interference condition, thereby eliminating the rainbow texture phenomenon of the display surface. The dot-shaped convex structures(s) in the embodiment of the invention are arranged in one-to-one correspondence with the sub-pixel units, so that the proper projection degree can be set for the wavelength of each sub-pixel unit, the emergent light of the sub-pixel units with different colors can destroy the interference condition of light, and rainbow fringes are eliminated.
Fig. 7 is a third schematic diagram of an optical path according to an embodiment of the present invention.
Referring to fig. 7, when a dot-shaped protrusion structure(s) is provided on one side substrate, a light reflected by the second lower substrate 21 has a convex arc structure at a position where it is incident on the first upper substrate 12, which changes a distance between the two substrates from the original d to d', and then an optical path difference between a light ray a2 and a light ray a 5:
where d' represents the distance from the arc to the upper substrate surface in fig. 7.
Then if the optical path difference between the transmitted light ray a2 and the light ray a5 is made to satisfy only the condition of first-order bright spots, the generation of other interference conditions can be eliminated, in which the radius of curvature of the point-like convex structure (microstructure s) satisfies:
where R represents a curvature radius of the microstructure, d represents a vertical distance between the first upper substrate 12 and the second lower substrate 21, a represents a width of the sub-pixel unit, and λ represents a wavelength of the light emitted from the sub-pixel unit.
Therefore, according to the wavelengths of the sub-pixel units with different colors, the convex surfaces of the dot-shaped convex structures(s) corresponding to the sub-pixel units are arranged according to the above formula, and have proper curvature radius, so that the rainbow stripes can be eliminated.
The point-like convex structures(s) on the substrate can be made of resin materials and formed on the surface of the substrate in a coating and re-stamping mode.
In order to facilitate the design and calculation of the point-shaped convex structures(s), the point-shaped convex structures(s) can be made of a material with the same refractive index as that of the substrate. Of course, the point-like convex structure made of other materials with refractive indexes can also achieve the purpose of the invention, and the materials used by the point-like convex structure are not limited herein.
Fig. 8 is a schematic diagram of an arrangement structure of sub-pixel units according to an embodiment of the present invention.
Referring to fig. 8, the sub-pixel units (13) in the embodiment of the invention are arranged in an array, and the sub-pixels with the same color are arranged in a plurality of rows, and the same sub-pixel unit row only includes sub-pixel units with one color. The sub-pixel unit (3) comprises a red sub-pixel unit R, a green sub-pixel unit G and a blue sub-pixel unit B, the three sub-pixel units are arranged along the column direction, and the same sub-pixel unit column only comprises one color sub-pixel unit.
Fig. 9 is a second top view of the substrate according to the embodiment of the invention.
Fig. 1, 5 and 6 may also be schematic cross-sectional views of a columnar protruding structure, and referring to fig. 1 and 9, in another embodiment of the present invention, the microstructure s may be a columnar protruding structure located on the surface of the substrate, and the columnar protruding structure corresponds to a sub-pixel unit column in a display panel to which the substrate belongs one to one. The columnar protruding structure is a structure with a surface protruding to form a cylindrical cambered surface.
Referring to fig. 1, in the embodiment of the invention, the pillar-shaped protrusion structure(s) is disposed on a surface of the first upper substrate 12 facing the second lower substrate 21, and protrudes toward the second lower substrate 21.
In addition, referring to fig. 5, the pillar-shaped protrusion structure(s) may be disposed on a surface of the second lower substrate 21 facing the first upper substrate 12; alternatively, referring to fig. 6, the stud bump structure(s) is provided on both the surface of the first upper substrate 12 facing the side of the second lower substrate 21 and the surface of the second lower substrate 21 facing the side of the first upper substrate 12.
The columnar protruding structures(s) are arranged on the surface of the substrate, so that the distance between the first upper substrate 12 and the second lower substrate 21 is no longer a fixed distance, and the optical path difference between the originally interfered light rays no longer meets the interference condition, thereby eliminating the rainbow texture phenomenon of the display surface. The columnar convex structures(s) in the embodiment of the invention are arranged in one-to-one correspondence with the sub-pixel unit columns containing the sub-pixel units with the same color, so that the proper protrusion degree can be set for the wavelength of each column of sub-pixel units, the emergent light of the sub-pixel units with different colors can destroy the interference condition of light, and rainbow patterns are eliminated.
When the columnar convex structure is adopted as the microstructure s on the surface of the substrate, the condition that the curvature radius of the cylindrical cambered surface on the surface of the columnar convex structure meets is the same as that of the punctiform convex structure, and the reasoning process is not repeated here.
The curvature radius of the columnar convex structure (microstructure s) satisfies the following conditions:
where R represents a curvature radius of the microstructure, d represents a vertical distance between the first upper substrate 12 and the second lower substrate 21, a represents a width of the sub-pixel unit, and λ represents a wavelength of the light emitted from the sub-pixel unit.
Therefore, according to the wavelengths of the sub-pixel units with different colors, the convex surfaces of the columnar convex structures(s) corresponding to the sub-pixel unit columns are arranged according to the above formula, and have proper curvature radiuses, so that the rainbow textures can be eliminated.
The columnar protruding structures(s) on the substrate can be made of resin materials and formed on the surface of the substrate through roller die casting.
In order to facilitate the design and calculation of the columnar convex structure(s), the columnar convex structure(s) can be made of a material with the same refractive index as that of the substrate. Of course, the above-mentioned stud bump structure made of other refractive index materials can also achieve the purpose of the present invention, and the material used for the stud bump structure is not limited herein.
Fig. 10 is a fourth schematic cross-sectional view of a display device according to an embodiment of the invention.
Referring to fig. 10, in another embodiment of the present invention, regarding the pixel arrangement structure shown in fig. 8, the microstructures s are columnar hollow structures located inside the substrate of the second display panel 200, and the columnar hollow structures correspond to the sub-pixel unit rows in the second display panel 200 one to one. The columnar hollow structure is a cylindrical hollow structure.
Referring to fig. 10, in the embodiment of the present invention, the second lower substrate 21 is provided with column-shaped hollow structures(s), each column-shaped hollow structure(s) corresponds to a column of sub-pixel units with the same color, and the extending direction of the column-shaped hollow structure is the same as the direction of the column of sub-pixel units. The columnar hollow structure is filled with air, so that the refractive index of the position with the columnar hollow structure is different from that of the second lower substrate 21, when light originally meeting interference conditions enters the position, the optical path of the light changes due to the change of the refractive index of the medium, the interference conditions are not met any more, and rainbow fringes are avoided.
According to the wavelengths of the sub-pixel units with different colors, the columnar hollow structures are respectively arranged to correspond to the sub-pixel unit columns with the same color, and rainbow lines can be eliminated.
The columnar hollow structure in the substrate can utilize a high-power laser device, convergence processing is carried out on the laser device, the position of a focus is positioned in the substrate, laser is emitted from the substrate, and therefore the hollow shape is burnt out in the substrate.
In the display device provided in the embodiment of the present invention, the first display panel 100 and the second display panel 200 may both adopt liquid crystal display panels, and since the liquid crystal display panels do not emit light autonomously, referring to fig. 11, a backlight module 300 needs to be disposed on a side of the first display panel 100 away from the second display panel 200.
The backlight module 300 is generally disposed at the bottom of the display device, and has a shape and size corresponding to those of the display device. The backlight module generally takes a rectangular shape.
The backlight module is used for uniformly emitting light in the whole light emitting surface, and providing light with sufficient brightness and uniform distribution for the display panel, so that the display panel can normally display images.
In addition, the first display panel 100 may further adopt an organic light emitting diode display panel, and the organic light emitting diode display panel independently emits light, so that a backlight module may be omitted, thereby reducing the overall thickness of the display device and facilitating the light and thin design of the display device.
According to the first invention concept, the microstructure is arranged on at least one substrate of the first display panel and the second display panel, and the fixed optical path difference formed between the two substrates by the light is destroyed by utilizing the modulation effect of the microstructure on the optical path of the incident light, so that the interference between the light is avoided, and the generation of rainbow patterns on the display surface is inhibited.
According to the second inventive concept, the sub-pixel units have different colors, and the wavelengths of the emergent light of the sub-pixel units with different colors are different. The microstructures are respectively arranged aiming at the sub-pixel units, so that the light rays emitted by the sub-pixel units with different colors can be inhibited from interfering with fringes, and the image display effect of the display device is optimized.
According to the third inventive concept, the microstructures may be disposed as dot-shaped protruding structures on the surface of the substrate, and the dot-shaped protruding structures are disposed on the surface of the substrate, so that the distance between the first upper substrate and the second lower substrate is no longer a fixed distance, and the optical path difference between the originally interfered light rays no longer satisfies the interference condition, thereby eliminating the rainbow texture phenomenon on the display surface. And the punctiform protruding structures and the sub-pixel units are arranged in a one-to-one correspondence manner, so that the proper protruding degree can be set for the wavelength of each sub-pixel unit, the emergent light of the sub-pixel units with different colors can destroy the interference condition of light, and rainbow fringes are eliminated.
According to the fourth inventive concept, the microstructure may be a columnar protruding structure located on the surface of the substrate, and the columnar protruding structure is arranged on the surface of the substrate, so that the distance between the first upper substrate and the second lower substrate is no longer a fixed distance, and the optical path difference between the originally interfered light rays no longer meets the interference condition, thereby eliminating the rainbow texture phenomenon of the display surface. And the columnar protruding structures are arranged in one-to-one correspondence with the sub-pixel unit columns containing the sub-pixel units with the same color, so that the proper protruding degree can be set aiming at the wavelength of each column of sub-pixel units, the interference condition of light can be damaged by emergent light of the sub-pixel units with different colors, and rainbow fringes are eliminated.
According to the fifth inventive concept, the radius of curvature of the microstructure s satisfies:
wherein, R represents the curvature radius of the microstructure, d represents the vertical distance between the first upper substrate and the second lower substrate, a represents the width of the sub-pixel unit, and λ represents the wavelength of the emergent light of the sub-pixel unit.
According to the sixth inventive concept, the refractive index of the microstructure is the same as that of the substrate, whereby the complexity of design and calculation can be simplified.
According to the seventh inventive concept, the microstructure may be a columnar hollow structure disposed in the second lower substrate, and the columnar hollow structure is filled with air, so that the refractive index of the position having the columnar hollow structure is different from the refractive index of the substrate, and thus when light originally satisfying the interference condition is incident to the position, the optical path of the light is changed due to the change of the refractive index of the medium, and the interference condition is no longer satisfied, thereby preventing the generation of rainbow fringes. According to the wavelengths of the sub-pixel units with different colors, the columnar hollow structures are respectively arranged to correspond to the sub-pixel unit columns with the same color, and rainbow lines can be eliminated.
According to the eighth inventive concept, the first display panel may employ a liquid crystal display panel or an organic light emitting diode display panel, and the second display panel may employ a liquid crystal display panel.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A display device, comprising:
a first display panel for modulating a backlight;
the second display panel is positioned on the light emergent side of the first display panel and used for displaying images;
the side of the first display panel facing the second display panel and the side of the second display panel facing the first display panel both comprise substrates;
at least one of the substrates is provided with a microstructure, and the microstructure is used for modulating the optical path of incident light, destroying the fixed optical path difference between the substrates and destroying the condition for generating interference;
the first display panel and the second display panel each include a sub-pixel unit; the microstructure of the substrate is arranged corresponding to the sub-pixel unit in the display panel to which the substrate belongs;
the microstructures are point-shaped protruding structures located on the surface of the substrate, and the point-shaped protruding structures correspond to the sub-pixel units in the display panel to which the substrate belongs one to one;
or the sub-pixel units are arranged in an array; the sub-pixel units have different colors, and the sub-pixel units with the same color are positioned in the same sub-pixel unit column; the microstructures are columnar protruding structures located on the surface of the substrate, and the columnar protruding structures correspond to the sub-pixel unit rows in the display panel to which the substrate belongs one to one;
or the sub-pixel units are arranged in an array; the sub-pixel units have different colors, and the sub-pixel units with the same color are positioned in the same sub-pixel unit column; the microstructures are columnar hollow structures located inside the substrate of the second display panel, and the columnar hollow structures correspond to the sub-pixel unit rows in the second display panel one to one.
2. The display device according to claim 1, wherein the microstructures are dot-like or columnar protruding structures; the radius of curvature of the microstructure satisfies the following relationship:
wherein R represents a curvature radius of the microstructure, d represents a vertical distance between the substrate in the first display panel and the substrate in the second display panel, a represents a width of the sub-pixel unit, and λ represents a wavelength of the light emitted from the sub-pixel unit.
3. The display device according to claim 1, wherein the microstructures are dot-like or columnar-like convex structures; the material of the microstructure is resin.
4. The display device of claim 3, wherein the microstructure of the substrate has a refractive index that is the same as the refractive index of the substrate.
5. The display device according to claim 1, wherein the first display panel and the second display panel are liquid crystal display panels;
the display device further includes:
and the backlight module is positioned on one side of the first display panel, which deviates from the second display panel.
6. The display device according to claim 1, wherein the first display panel is an organic light emitting diode display panel; the second display panel is a liquid crystal display panel.
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