CN113589578A - Liquid crystal display device and method for manufacturing the same - Google Patents
Liquid crystal display device and method for manufacturing the same Download PDFInfo
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- CN113589578A CN113589578A CN202110833805.4A CN202110833805A CN113589578A CN 113589578 A CN113589578 A CN 113589578A CN 202110833805 A CN202110833805 A CN 202110833805A CN 113589578 A CN113589578 A CN 113589578A
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- 239000000758 substrate Substances 0.000 claims abstract description 103
- 230000003287 optical effect Effects 0.000 claims abstract description 63
- 150000001875 compounds Chemical class 0.000 claims description 56
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 12
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 238000007699 photoisomerization reaction Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 6
- 239000011295 pitch Substances 0.000 description 107
- 239000010410 layer Substances 0.000 description 78
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 150000001988 diarylethenes Chemical class 0.000 description 1
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- UOYPNWSDSPYOSN-UHFFFAOYSA-N hexahelicene Chemical compound C1=CC=CC2=C(C=3C(=CC=C4C=CC=5C(C=34)=CC=CC=5)C=C3)C3=CC=C21 UOYPNWSDSPYOSN-UHFFFAOYSA-N 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
- G02F1/133528—Polarisers
- G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
The application discloses a liquid crystal display device and a preparation method thereof, wherein the liquid crystal display device comprises an array substrate, a cholesteric liquid crystal layer, a color film substrate and a polarizer which are sequentially arranged; the color film substrate comprises an optical filter, and the optical filter is arranged opposite to the cholesteric liquid crystal layer; the polaroid covers the cholesteric liquid crystal layer, and the optical rotation direction of the polaroid is the same as the pitch rotation direction of cholesteric liquid crystal in the cholesteric liquid crystal layer. According to the liquid crystal display device, the cholesteric liquid crystal is matched with the single polarizer, so that the light attenuation phenomenon is reduced on the premise of ensuring the display function of the liquid crystal display device, and the energy consumption of the liquid crystal display device is reduced.
Description
Technical Field
The application relates to the technical field of display, in particular to a liquid crystal display device and a preparation method thereof.
Background
Liquid Crystal Displays (LCD) are one of the most developed and widely used flat panel display technologies. Most of the LCDs in the existing market are transmissive LCDs including a backlight source, and include two major parts, a liquid crystal display device and a backlight module. The LCD device generally includes an array substrate, a cholesteric liquid crystal layer, a color film substrate, an upper polarizer and a lower polarizer, however, the use of the upper polarizer and the lower polarizer aggravates light attenuation, which increases the power consumption of the LCD.
Disclosure of Invention
The embodiment of the application provides a liquid crystal display device and a preparation method thereof, which aim to solve the technical problem of energy consumption increase of an LCD in the prior art.
The application provides a liquid crystal display device, liquid crystal display device includes:
an array substrate;
the cholesteric liquid crystal layer is arranged on the array substrate;
the color film substrate is arranged on the cholesteric liquid crystal layer and comprises an optical filter, and the optical filter is arranged opposite to the cholesteric liquid crystal layer; and
the polaroid is arranged on the color film substrate and covers the cholesteric liquid crystal layer, and the optical rotation direction of the polaroid is the same as the pitch rotation direction of cholesteric liquid crystal in the cholesteric liquid crystal layer.
Optionally, in some embodiments of the present application, the wavelength range of the light reflected by the cholesteric liquid crystal covers the wavelength range of the light transmitted by the filter.
Optionally, in some embodiments of the present application, the array substrate has a plurality of pixel regions, each of the pixel regions has a first sub-pixel region and a second sub-pixel region, the color filter substrate includes a first optical filter and a second optical filter, the first optical filter is located in the first sub-pixel region, the second optical filter is located in the second sub-pixel region, and a wavelength range of light transmitted by the first optical filter is different from a wavelength range of light transmitted by the second optical filter;
the wavelength range of the light reflected by the cholesteric liquid crystal positioned in the first sub-pixel area covers the wavelength range of the light transmitted by the first optical filter, and the wavelength range of the light reflected by the cholesteric liquid crystal positioned in the second sub-pixel area covers the wavelength range of the light transmitted by the second optical filter.
Optionally, in some embodiments of the present application, each of the pixel regions further includes a third sub-pixel region, the color film substrate further includes a third optical filter located in the third sub-pixel region, a wavelength range of light reflected by cholesteric liquid crystal located in the third sub-pixel region covers a wavelength range of light transmitted by the third optical filter, and the wavelength range of light transmitted by the first optical filter, the wavelength range of light transmitted by the second optical filter, and the wavelength range of light transmitted by the third optical filter are different;
the cholesteric liquid crystal in the first sub-pixel area has a first helical pitch L1, the cholesteric liquid crystal in the second sub-pixel area has a second helical pitch L2, the cholesteric liquid crystal in the third sub-pixel area has a third helical pitch L3, and L1, L2 and L3 are different.
Optionally, in some embodiments of the present application, the first filter transmits blue light, the second filter transmits green light, and the third filter transmits red light; the cholesteric liquid crystal in the first sub-pixel region reflects blue light, the cholesteric liquid crystal in the second sub-pixel region reflects green light, the cholesteric liquid crystal in the third sub-pixel region reflects red light, and L1< L2< L3.
Optionally, in some embodiments of the present application, the cholesteric liquid crystal comprises nematic liquid crystal and a photoisomerization type chiral compound, and in the first sub-pixel region, the chiral compound has a first mass content M1 in the cholesteric liquid crystal; in the second sub-pixel region, the chiral compound has a second mass content M2 in the cholesteric liquid crystal; in the third sub-pixel region, the chiral compound has a third mass content M3 in the cholesteric liquid crystal; m1> M2> M3.
Optionally, in some embodiments of the present application, the array substrate has a plurality of sub-pixel regions and a plurality of spacers, and the spacers are disposed between two adjacent sub-pixel regions to form an independent space for accommodating the cholesteric liquid crystal corresponding to each sub-pixel region.
Optionally, in some embodiments of the present application, the polarizer is a circular polarizer.
The embodiment of the application also provides a preparation method of the liquid crystal display device, which is characterized by comprising the following steps:
providing a display substrate, wherein the display substrate comprises an array substrate, a color film substrate and a cholesteric liquid crystal layer arranged between the array substrate and the color film substrate, and the color film substrate comprises an optical filter arranged opposite to the cholesteric liquid crystal layer;
carrying out ultraviolet irradiation on the cholesteric liquid crystal layer;
and attaching a polarizer on the color film substrate, wherein the polarizer covers the cholesteric liquid crystal layer, and the optical rotation direction of the polarizer is the same as the pitch rotation direction of cholesteric liquid crystal in the cholesteric liquid crystal layer.
Optionally, in some embodiments of the present application, the array substrate has a plurality of pixel areas, each of the pixel areas includes a first sub-pixel area, a second sub-pixel area, and a third sub-pixel area, the cholesteric liquid crystal in the first sub-pixel area has a first pitch L1, and the step of irradiating the cholesteric liquid crystal layer with ultraviolet light includes:
and ultraviolet light is irradiated on the cholesteric liquid crystals in the second sub-pixel area and the third sub-pixel area, so that the cholesteric liquid crystals in the second sub-pixel area have a second pitch L2, the cholesteric liquid crystals in the third sub-pixel area have a third pitch L3, and L1< L2< L3.
Compared with the liquid crystal display device in the prior art, in the liquid crystal display device provided by the present application, when the cholesteric liquid crystal is in a planar state, the cholesteric liquid crystal reflects the light with the specific color in the same pitch rotation direction, and transmits the light with the specific color opposite to the pitch rotation direction and other colors. When light passing through the cholesteric liquid crystal is emitted into the polarizer through the optical filter, the optical rotation direction of the polarizer is the same as the pitch rotation direction of the cholesteric liquid crystal, so that light of a specific color opposite to the optical rotation direction of the polarizer cannot pass through the polarizer, and the liquid crystal display device is in a dark state. When the cholesteric liquid crystal is in a vertical state, light penetrating through the cholesteric liquid crystal is emitted into the polarizer through the optical filter and is emitted out of the polarizer, so that the liquid crystal display device is in a bright state, and then the display picture is regulated and controlled under the driving of the array substrate. Therefore, the cholesteric liquid crystal in the cholesteric liquid crystal layer is matched with the single polarizer, the use of one polarizer can be reduced on the basis of realizing the display function of the liquid crystal display device, so that the light attenuation phenomenon can be reduced, and the energy consumption of the liquid crystal display device is further reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a liquid crystal display device provided in an embodiment of the present application before a voltage is applied.
Fig. 2 is a schematic structural diagram of a liquid crystal display device provided in an embodiment of the present application after a voltage is applied.
Fig. 3 is a schematic flow chart of a method for manufacturing a liquid crystal display device provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
The application provides a liquid crystal display device and a preparation method thereof. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
The application provides a liquid crystal display device, which comprises an array substrate, a cholesteric liquid crystal layer, a color film substrate and a polarizer, wherein the array substrate, the cholesteric liquid crystal layer, the color film substrate and the polarizer are sequentially arranged. The color film substrate comprises an optical filter. The optical filter is arranged opposite to the cholesteric liquid crystal layer. The polaroid covers the cholesteric liquid crystal layer. The optical rotation direction of the polaroid is the same as the pitch rotation direction of cholesteric liquid crystal in the cholesteric liquid crystal layer.
When the cholesteric liquid crystal is in a planar state, the cholesteric liquid crystal reflects light of a specific color in the same direction as the helical pitch of the cholesteric liquid crystal, and transmits light of the specific color opposite to the helical pitch of the cholesteric liquid crystal and light of other colors. When light passing through the cholesteric liquid crystal is emitted into the polarizer through the optical filter, the optical rotation direction of the polarizer is the same as the pitch rotation direction of the cholesteric liquid crystal, so that light of a specific color opposite to the optical rotation direction of the polarizer cannot pass through the polarizer, and the liquid crystal display device is in a dark state. When the cholesteric liquid crystal is in a vertical state, light penetrating through the cholesteric liquid crystal is emitted into the polarizer through the optical filter and is emitted out of the polarizer, so that the liquid crystal display device is in a bright state, and then the display picture is regulated and controlled under the driving of the array substrate.
Therefore, compared with the liquid crystal display device in the prior art, the liquid crystal display device provided by the application can reduce the use of one polarizer on the basis of realizing the display function of the liquid crystal display device by utilizing the cholesteric liquid crystal in the cholesteric liquid crystal layer and matching the cholesteric liquid crystal with the single polarizer, so that the light attenuation phenomenon can be reduced, and the energy consumption of the liquid crystal display device is further reduced.
The liquid crystal display device provided in the embodiments of the present application will be explained in detail below.
Referring to fig. 1 and fig. 2, an embodiment of the present application provides a liquid crystal display device 100. The liquid crystal display device 100 includes an array substrate 1, a cholesteric liquid crystal layer 2, a color film substrate 3, and a polarizer 4, which are sequentially disposed.
The array substrate 1 has a plurality of pixel regions 1 a. Each pixel region 1a includes a first sub-pixel region a, a second sub-pixel region B, and a third sub-pixel region C. In this embodiment, the first sub-pixel region a is a blue sub-pixel region. The second sub-pixel region B is a green sub-pixel region. The third sub-pixel region C is a red sub-pixel region.
In some embodiments, each pixel region 1a may also only include a first sub-pixel region a and a second sub-pixel region B, which is not described herein again.
It should be noted that the embodiment of the present application only illustrates the structure of one pixel region 1a, but is not limited thereto.
The array substrate 1 includes a first substrate 11, a thin film transistor functional layer 12, and a pixel electrode layer 13, which are sequentially disposed.
The first substrate base plate 11 may be a rigid base plate, such as a glass base plate. In some embodiments, the first substrate 11 may also be a flexible substrate, and the material of the flexible substrate may be polyimide.
It should be noted that, in this embodiment, the specific structure of the thin film transistor functional layer 12 may refer to the prior art, and is not described herein again.
The color film substrate 3 includes a second substrate 31, a color film functional layer 32, and a common electrode layer 33, which are sequentially disposed.
The second substrate 31 may be a rigid substrate, such as a glass substrate. In some embodiments, the second substrate 31 may be a flexible substrate, and a material of the flexible substrate may be polyimide.
The color filter functional layer 32 includes a first optical filter 321, a second optical filter 322, and a third optical filter 323. The first filter 321 is located in the first sub-pixel region a. The second filter 322 is located in the second sub-pixel region B. The third filter 323 is located in the third sub-pixel region C. The wavelength range of light transmitted by the first filter 321, the wavelength range of light transmitted by the second filter 322, and the wavelength range of light transmitted by the third filter 323 are different.
It should be noted that, in this embodiment, a black matrix (not labeled in the figure) may also be disposed between adjacent filters, which is not described herein again.
The cholesteric liquid crystal layer 2 comprises cholesteric liquid crystals 21. The cholesteric liquid crystal 21 has a characteristic of selectively reflecting light. The cholesteric liquid crystal 21 having a planar orientation can reflect light having the same pitch rotation direction as the cholesteric liquid crystal and transmit other light. The wavelength of the light reflected by the cholesteric liquid crystal 21 is determined by the pitch and the refractive index of the cholesteric liquid crystal 21, when the material of the cholesteric liquid crystal 21 is fixed, the refractive index of the cholesteric liquid crystal 21 is not changed, and the pitch of the cholesteric liquid crystal 21 is changed, so that the wavelength can be regulated, and the part of the cholesteric liquid crystal 21 corresponding to each sub-pixel area can reflect the light with the corresponding color. Specifically, when the cholesteric liquid crystal 21 is in a planar state, the helical pitches of the portions of the cholesteric liquid crystal 21 corresponding to the first sub-pixel area a, the second sub-pixel area B and the third sub-pixel area C are different, so that the portions of the cholesteric liquid crystal 21 corresponding to the first sub-pixel area a, the second sub-pixel area B and the third sub-pixel area C reflect different color lights.
For example, the cholesteric liquid crystal 21 positioned at the first sub-pixel area a has a first pitch L1 for reflecting blue light. The cholesteric liquid crystal 21 at the second sub-pixel region B has a second helical pitch L2 for reflecting green light. The cholesteric liquid crystal 21 at the third sub-pixel region C has a third helical pitch L3 for reflecting red light. L1< L2< L3. When the material of the cholesteric liquid crystal 21 is fixed, the helical pitch of the cholesteric liquid crystal 21 in each sub-pixel area can be calculated according to the reflection wavelength of blue light, green light and red light.
The wavelength range of the light reflected by the cholesteric liquid crystal 21 covers the wavelength range of the light transmitted by the filter. For example, the wavelength range of the light reflected by the cholesteric liquid crystal 21 in the first sub-pixel region a covers the wavelength range of the light transmitted by the first filter 321. The wavelength range of the light reflected by the cholesteric liquid crystal 21 in the second sub-pixel region B covers the wavelength range of the light transmitted by the second filter 322. The wavelength range of the light reflected by the cholesteric liquid crystal 21 positioned in the third sub-pixel region C covers the wavelength range of the light transmitted by the third filter 323.
For example, the cholesteric liquid crystal 21 in the first sub-pixel region a reflects blue light with a central wavelength of 447nm to 487nm, and the first filter 321 is a blue filter, that is, the first filter 321 transmits blue light. The cholesteric liquid crystal 21 in the second sub-pixel region B reflects green light with a central wavelength of 512nm to 552nm, and the second filter 322 is a green filter, i.e., the second filter 322 transmits the green light. The cholesteric liquid crystal 21 in the third sub-pixel region C reflects red light with a central wavelength of 610nm to 650nm, and the third filter 323 is a red filter, i.e., the third filter 323 transmits red light.
In one embodiment, the central wavelength of reflection of the cholesteric liquid crystal 21 in the first sub-pixel region a is 467nm, the central wavelength of reflection of the cholesteric liquid crystal 21 in the second sub-pixel region B is 532nm, and the central wavelength of reflection of the cholesteric liquid crystal 21 in the third sub-pixel region C is 630 nm.
The cholesteric liquid crystal 21 includes a nematic liquid crystal and a chiral compound. The color of the light reflected by the cholesteric liquid crystal 21 is determined by the average refractive index of the cholesteric liquid crystal 21 and the pitch of the chiral compound. When the material of the cholesteric liquid crystal 21 is unchanged, the average refractive index of the cholesteric liquid crystal 21 is unchanged, and the color of the light reflected by the cholesteric liquid crystal 21 is determined by the pitch of the chiral compound, which is equal to the pitch of the cholesteric liquid crystal 21.
Further, the pitch of the chiral compound is determined by the content of the chiral compound in the cholesteric liquid crystal 21 and the helical twisting power of the chiral compound. When the kinds of the nematic liquid crystal and the chiral compound are not changed, the helical twisting power of the chiral compound is not changed, and the pitch of the chiral compound is determined by the content of the chiral compound. Therefore, by controlling the content of the chiral compound in the cholesteric liquid crystal 21, the pitch of the chiral compound can be controlled, so that the pitch of the cholesteric liquid crystal 21 can be controlled.
Wherein, the content of the chiral compound in the cholesteric liquid crystal 21 is inversely related to the pitch of the cholesteric liquid crystal 21. For example, in the first sub-pixel area a, the chiral compound has a first mass content M1 in the cholesteric liquid crystal 21, in the second sub-pixel area B, the chiral compound has a second mass content M2 in the cholesteric liquid crystal 21, and in the third sub-pixel area C, the chiral compound has a third mass content M3 in the cholesteric liquid crystal 21, M1> M2> M3, and correspondingly, L1< L2< L3, by changing the sizes of M1, M2, and M3, the adjustment of L1, L2, and L3 can be realized, and further the control of the pitch of the cholesteric liquid crystal 21 can be realized.
In this embodiment, the chiral compound in the cholesteric liquid crystal 21 is an ultraviolet photoisomerization type chiral compound. Before the ultraviolet light is irradiated, the chiral compound has a preset pitch rotation direction, such as left-handed rotation or right-handed rotation, after the ultraviolet light is irradiated, the chiral compound is isomerized, and the corresponding chiral direction is reversed, so that the content of the chiral compound having the preset pitch rotation direction in the cholesteric liquid crystal 21 is changed, and at the moment, the pitch of the chiral compound is changed, that is, the pitch of the cholesteric liquid crystal 21 in the ultraviolet light irradiation area is changed. After the ultraviolet light irradiation, the content of the chiral compound in the cholesteric liquid crystal 21 is reduced, and since the pitch of the chiral compound and the content of the chiral compound are in negative correlation, the pitch of the chiral compound can be increased by the ultraviolet light irradiation, so that the pitch partition of the cholesteric liquid crystal layer 2 can be realized.
Wherein, the ultraviolet light induced isomerization type chiral compound can be at least one of chiral helicene, chiral diarylethene, chiral azo and chiral dense ring structure. By controlling the intensity and time of the ultraviolet light irradiation, the amount of the chiral compound that is isomerized can be controlled, thereby controlling the mass content of the chiral compound in the cholesteric liquid crystal 21.
In this embodiment, the array substrate 1 further includes a first alignment layer 14. The first alignment layer 14 is located on the side of the pixel electrode layer 13 close to the cholesteric liquid crystal layer 2. The color filter substrate 3 further includes a second alignment layer 34. The second alignment layer 34 is located on the common electrode layer 33 on the side close to the cholesteric liquid crystal layer 2. The first alignment layer 14 and the second alignment layer 34 serve to align the cholesteric liquid crystal 21 in the cholesteric liquid crystal layer 2 such that the cholesteric liquid crystal 21 has an initial alignment state before no voltage is applied to the liquid crystal display device 100.
The initial alignment state of the cholesteric liquid crystal 21 is related to the type of nematic liquid crystal. When the nematic liquid crystal is a positive nematic liquid crystal, the initial alignment state of the cholesteric liquid crystal 21 is a planar state and has a preset pitch rotation direction, and the preset pitch rotation direction is left-handed or right-handed. When the nematic liquid crystal is a negative nematic liquid crystal, the initial alignment state of the cholesteric liquid crystal 21 is a homeotropic state, and in this case, after a voltage is applied to the liquid crystal display device 100, the cholesteric liquid crystal 21 has a preset pitch rotation direction which is left-handed or right-handed.
It should be noted that, in some embodiments, an alignment layer may be disposed only in any one of the array substrate 1 and the color filter substrate 3, which is not limited in this application.
Further, the array substrate 1 further includes a plurality of spacers 15. The spacer 15 is disposed on the first alignment layer 14 and located between adjacent sub-pixel regions to form an independent space for accommodating the cholesteric liquid crystal 21 corresponding to each sub-pixel region, so as to realize pitch division of the cholesteric liquid crystal 21. Specifically, on the array substrate 1, a spacer 15 is disposed between adjacent pixel regions 1a, and the spacer 15 is disposed between the first sub-pixel region a and the second sub-pixel region B, and between the second sub-pixel region B and the third sub-pixel region C in each pixel region 1 a. In addition, in some embodiments, the spacer 15 may also be disposed on the color filter substrate 3, and it is within the scope of the present application as long as the spacer 15 is ensured to be capable of blocking the cholesteric liquid crystals 21 in different sub-pixel regions.
The direction of rotation of the polarizer 4 is the same as the direction of helical pitch rotation of the cholesteric liquid crystal 21. The polarizer 4 may be a circular polarizer or an elliptical polarizer. In the present embodiment, the polarizer 4 is a circular polarizer. The use of the circular polarizer may improve the contrast of the liquid crystal display device 100. Wherein, the circular polarizer comprises a linear polarizer and a phase delay film. The phase retardation film may be a half wave plate and/or a quarter wave plate.
In the present embodiment, the liquid crystal display device 100 further includes a quantum dot backlight module 5. The quantum dot backlight module 5 is located on one side of the array substrate 1 far away from the cholesteric liquid crystal layer 2. The quantum dot backlight module 5 includes a blue light source 51 and a light conversion layer 52. The blue light source 51 may be a blue LED lamp panel. Light conversion layer 52 may be red green quantum dots and/or yellow quantum dots.
When receiving photoelectric stimulation, the quantum dots can excite monochromatic light with different colors according to different particle sizes of the quantum dots. Therefore, compared with the LED backlight, the quantum dots display colors more purer, and can provide a wider color gamut and a wider viewing angle, thereby being beneficial to improving the display effect of the liquid crystal display device 100.
Referring to fig. 1 and 2, taking the nematic liquid crystal as a positive nematic liquid crystal and the preset pitch rotation direction of the cholesteric liquid crystal 21 as a left-hand rotation as an example, the response mechanism of the liquid crystal display device 100 in this embodiment is as follows:
before the liquid crystal display device 100 is applied with no voltage, the voltage difference V between the pixel electrode layer 13 and the common electrode layer 33 is 0, the initial alignment state of the cholesteric liquid crystal 21 is a planar state, and the pitch rotation direction of the cholesteric liquid crystal 21 is left-handed. Taking the first sub-pixel area a as an example: (1) when light emitted by the backlight module is emitted into the cholesteric liquid crystal layer 2 from the array substrate 1, the part of the cholesteric liquid crystal 21 corresponding to the first sub-pixel area A reflects left-handed blue light, and the right-handed blue light and other colors of light can penetrate through the cholesteric liquid crystal layer 2; (2) when light transmitted through the cholesteric liquid crystal layer 2 enters the color film substrate 3, only the right-handed blue light can transmit through the first optical filter 321 because the first optical filter 321 only allows the blue light to transmit; (3) when the right-handed blue light passing through the color film substrate 3 is incident on the polarizer 4, since the optical rotation direction of the polarizer 4 is the same as the pitch rotation direction of the cholesteric liquid crystal 21, the polarizer 4 can only pass the left-handed light, i.e., the right-handed blue light cannot pass through the polarizer 4, so that the first sub-pixel region a does not have light transmission. At this time, the liquid crystal display device 100 is in a dark state corresponding to the entire liquid crystal display device 100.
After the liquid crystal display device 100 applies a voltage, the voltage difference V between the pixel electrode layer 13 and the common electrode layer 33 is not equal to 0, the orientation state of the cholesteric liquid crystal 21 is a vertical state, and when light emitted by the backlight module enters the cholesteric liquid crystal layer 2 from the array substrate 1, the light directly penetrates the cholesteric liquid crystal 21, enters the color film substrate 3, and is emitted from the polarizer 4, so that the liquid crystal display device 100 is switched to a bright state. Furthermore, the first optical filter 321 corresponding to the first sub-pixel region a only allows blue light to transmit, the second optical filter 322 corresponding to the second sub-pixel region B only allows green light to transmit, and the third optical filter 323 corresponding to the third sub-pixel region C only allows red light to transmit, so that the display screen can be controlled under the driving of the thin film transistor functional layer 12.
In some embodiments, where the nematic liquid crystal is a negative nematic liquid crystal, the response mechanism of the liquid crystal display device 100 differs from that when a positive nematic liquid crystal is used: when V is 0, the initial alignment state of the cholesteric liquid crystal 21 is a homeotropic state; v ≠ 0, and the alignment state of the cholesteric liquid crystal 21 is a planar state. When the alignment state of the cholesteric liquid crystal 21 is a vertical state and a planar state, the response mechanism of the liquid crystal display device 100 can refer to the description of the response mechanism of the positive nematic liquid crystal corresponding to the liquid crystal display device 100, and is not described herein again.
Therefore, in the liquid crystal display device 100 provided by this embodiment, the cholesteric liquid crystal 21 in the cholesteric liquid crystal layer 2 is matched with a single polarizer 4, and the use of one polarizer 4 can be reduced on the basis of realizing the display function of the liquid crystal display device 100, so that the light attenuation phenomenon can be reduced, the energy consumption of the liquid crystal display device 100 can be reduced, and the utilization rate of the backlight can be further improved. In addition, the above arrangement simplifies the structure of the liquid crystal display device 100, and is advantageous for realizing a thin design of the liquid crystal display device 100.
Referring to fig. 3, the present application further provides a method for manufacturing a liquid crystal display device, where the method for manufacturing a liquid crystal display device includes the following steps:
providing a display substrate, wherein the display substrate comprises an array substrate, a color film substrate and a cholesteric liquid crystal layer arranged between the array substrate and the color film substrate, and the color film substrate comprises an optical filter arranged opposite to the cholesteric liquid crystal layer;
carrying out ultraviolet irradiation on the cholesteric liquid crystal layer;
and attaching a polarizer on the color film substrate, wherein the polarizer covers the cholesteric liquid crystal layer, and the optical rotation direction of the polarizer is the same as the pitch rotation direction of cholesteric liquid crystal in the cholesteric liquid crystal layer.
The following describes a method for manufacturing a liquid crystal display device provided in the present application in detail.
The present application provides a first embodiment of a method of manufacturing a liquid crystal display device, comprising the steps of:
b1: a display substrate is provided.
Step B1 specifically includes the following steps:
b11: an array substrate and a color film substrate are provided.
The array substrate is provided with a plurality of pixel areas. Each pixel region comprises a first sub-pixel region, a second sub-pixel region and a third sub-pixel region. In one embodiment, the first sub-pixel region is a blue sub-pixel region. The second sub-pixel region is a green sub-pixel region. The third sub-pixel region is a red sub-pixel region. The array substrate comprises a first substrate, a thin film transistor functional layer, a pixel electrode layer and a first alignment layer which are sequentially arranged.
The color film substrate comprises a second substrate, a color film functional layer, a common electrode layer and a second alignment layer which are sequentially arranged. The color film functional layer comprises a first optical filter, a second optical filter and a third optical filter. The first filter corresponds to the first sub-pixel region. The first filter is a blue filter. The second filter corresponds to the second sub-pixel region. The second filter is a green filter. The third filter corresponds to the third sub-pixel region. The third filter is a red filter. A black matrix is arranged between the adjacent filters.
B12: and forming a cholesteric liquid crystal layer between the array substrate and the color film substrate.
First, a plurality of spacers are formed on an array substrate. The spacing part is positioned between the adjacent sub-pixel areas so as to form an independent space for accommodating cholesteric liquid crystal corresponding to each sub-pixel area in a surrounding mode.
Next, cholesteric liquid crystal is dropped in a region between adjacent spacers to form a cholesteric liquid crystal layer. Among them, the cholesteric liquid crystal layer may be formed by a liquid crystal Drop Fill (ODF) process or an Ink-Jet Printing (IJP) process. In the present embodiment, the cholesteric liquid crystal includes a positive nematic liquid crystal and a chiral compound.
B13: and carrying out pair combination and lamination on the array substrate and the color film substrate on which the cholesteric liquid crystal layer is formed, wherein the array substrate, the cholesteric liquid crystal layer and the color film substrate form a display substrate.
The thread pitches of the cholesteric liquid crystals in the cholesteric liquid crystal layer corresponding to the first sub-pixel area, the second sub-pixel area and the third sub-pixel area are the same and are all the first thread pitch L1, namely, the cholesteric liquid crystals in the first sub-pixel area have the first thread pitch L1. The initial reflection band of cholesteric liquid crystals is blue light. The portion of the cholesteric liquid crystal corresponding to the first sub-pixel region can be used to reflect blue light. When the material of the cholesteric liquid crystal is fixed, the pitch of the cholesteric liquid crystal can be calculated by reflecting the central wavelength of blue light, namely the first pitch L1.
B2: and irradiating the cholesteric liquid crystal layer with ultraviolet light to form the cholesteric liquid crystal layer. The thread pitches of the parts of the cholesteric liquid crystal in the cholesteric liquid crystal layer, which correspond to the first sub-pixel area, the second sub-pixel area and the third sub-pixel area, are different.
Specifically, ultraviolet light is irradiated on the cholesteric liquid crystals in the second sub-pixel area and the third sub-pixel area, so that the cholesteric liquid crystals in the second sub-pixel area have a second pitch L2, the cholesteric liquid crystals in the third sub-pixel area have a third pitch L3, and L1< L2< L3.
Step B2 specifically includes the following steps:
b21: and simultaneously irradiating parts of the cholesteric liquid crystal corresponding to the second sub-pixel area and the third sub-pixel area with first ultraviolet light so that the parts of the cholesteric liquid crystal corresponding to the second sub-pixel area and the third sub-pixel area have a second pitch L2, wherein L1< L2.
Wherein, the first ultraviolet irradiation is completed by the first mask plate. The first mask plate comprises a first shading area and a first light transmission area. The first light-shielding region corresponds to the first sub-pixel region to ensure that the content of the chiral compound in the part of the cholesteric liquid crystal corresponding to the first sub-pixel region is unchanged, namely the first thread pitch L1 is unchanged. The first light-transmitting area corresponds to the second sub-pixel area and the third sub-pixel area so as to realize ultraviolet irradiation on the cholesteric liquid crystal in the second sub-pixel area and the third sub-pixel area simultaneously.
Specifically, under the irradiation of the first ultraviolet light, in the second sub-pixel area and the third sub-pixel area, the mass content of the chiral compound in the cholesteric liquid crystal is reduced, and the pitch of the cholesteric liquid crystal is increased. At this time, the portions of the cholesteric liquid crystal corresponding to the second and third sub-pixel regions each have a second pitch L2, and L1< L2. At this time, a portion of the cholesteric liquid crystal corresponding to the second sub-pixel region serves to reflect green light.
When the material of the cholesteric liquid crystal is fixed, the pitch of the cholesteric liquid crystal can be calculated by reflecting the central wavelength of green light, and then the mass content of the chiral compound required in the cholesteric liquid crystal in an ultraviolet irradiation area is calculated according to the pitch value. Before ultraviolet irradiation, the value of the ultraviolet product light quantity of the first ultraviolet light can be set by controlling the irradiation intensity and the irradiation time of the first ultraviolet light, and then the value of the ultraviolet product light quantity is regulated and controlled to achieve the value of the mass content of the chiral compound required in the cholesteric liquid crystal so as to obtain the value of the thread pitch L2 required by the second sub-pixel area, thereby realizing the thread pitch subarea of the first sub-pixel area and the second sub-pixel area.
B22: and performing second ultraviolet irradiation on the part of the cholesteric liquid crystal corresponding to the third sub-pixel area so that the part of the cholesteric liquid crystal corresponding to the third sub-pixel area has a third screw pitch L3, wherein L2< L3.
And finishing second ultraviolet irradiation by using a second mask plate. The second mask plate comprises a second shading area and a second light transmission area. The second light-shielding region corresponds to the first sub-pixel region and the second sub-pixel region to ensure that the content of the chiral compound in the part of the cholesteric liquid crystal corresponding to the first sub-pixel region and the second sub-pixel region is unchanged, i.e. the values of the first pitch L1 and the second pitch L2 are unchanged. The second light-transmitting area corresponds to the third sub-pixel area so as to realize independent ultraviolet irradiation on the cholesteric liquid crystal in the third sub-pixel area.
Specifically, under the irradiation of the second ultraviolet light, in the third sub-pixel area, the mass content of the chiral compound in the cholesteric liquid crystal is further reduced, and the pitch of the cholesteric liquid crystal is increased. At this time, a portion of the cholesteric liquid crystal corresponding to the third sub-pixel region has a third pitch L3, L2< L3. At this time, a portion of the cholesteric liquid crystal corresponding to the third sub-pixel region serves to reflect red light.
When the material of the cholesteric liquid crystal is fixed, the pitch of the cholesteric liquid crystal can be calculated by reflecting the central wavelength of red light, and then the mass content of the chiral compound required in the cholesteric liquid crystal in an ultraviolet irradiation area is calculated according to the pitch value. Before ultraviolet irradiation, the value of the ultraviolet product light quantity of the second ultraviolet light can be set by controlling the irradiation intensity and the irradiation time of the second ultraviolet light, and then the value of the ultraviolet product light quantity is regulated and controlled to achieve the value of the mass content of the chiral compound required in the cholesteric liquid crystal so as to obtain the pitch value L3 required by the third sub-pixel area, thereby realizing the pitch partition of the second sub-pixel area and the third sub-pixel area.
After the first ultraviolet light irradiation and the second ultraviolet light irradiation, the cholesteric liquid crystal layer is formed into the cholesteric liquid crystal layer. The part of the cholesteric liquid crystal in the cholesteric liquid crystal layer, which corresponds to the first sub-pixel area, is provided with a first screw pitch L1, the part, which corresponds to the second sub-pixel area, is provided with a second screw pitch L2, the part, which corresponds to the third sub-pixel area, is provided with a third screw pitch L3, and L1< L2< L3, so that screw pitch partition of the liquid crystal display device is realized.
In the method for forming the cholesteric liquid crystal layer, because the ultraviolet irradiation of the cholesteric liquid crystal in the second sub-pixel area and the third sub-pixel area is simultaneously completed when the first ultraviolet irradiation is performed on the cholesteric liquid crystal, when the second ultraviolet irradiation is adopted to increase the pitch of the cholesteric liquid crystal corresponding to the third sub-pixel area, the required pitch value of the cholesteric liquid crystal can be achieved under relatively low irradiation intensity or irradiation time, and the process cost can be reduced.
In addition, in the prior art, cholesteric liquid crystals with different chiral compound contents are usually dripped in different sub-pixel areas to realize pitch division. In the application, when the cholesteric liquid crystal layer is formed, the content of the chiral compound in the cholesteric liquid crystal dripped in all the sub-pixel areas is the same, and the pitch division can be realized through ultraviolet irradiation, so that the liquid crystal filling process is simplified, and the process cost is favorably saved.
B3: and a polarizer is attached to one side of the color film substrate, which is far away from the cholesteric liquid crystal layer, the polarizer covers the cholesteric liquid crystal layer, and the optical rotation direction of the polarizer is the same as the pitch rotation direction of the cholesteric liquid crystal. The polarizer may be a circular polarizer.
After the step B3, the method for manufacturing a liquid crystal display device further includes:
b4: and assembling a backlight module on one side of the array substrate, which is far away from the cholesteric liquid crystal layer. The backlight module can be a quantum dot backlight module.
Thus, the method for manufacturing the liquid crystal display device described in this embodiment was completed.
It should be noted that, the response mechanism of the liquid crystal display device prepared in the present application can refer to the description of the foregoing embodiments, and is not repeated herein.
The present application also provides a second embodiment of a method of manufacturing a liquid crystal display device, the second embodiment being different from the first embodiment in that: step B2 includes the following steps:
b21': and performing first ultraviolet irradiation on the part of the cholesteric liquid crystal corresponding to the second sub-pixel area so that the part of the cholesteric liquid crystal corresponding to the second sub-pixel area has a second helical pitch L2, wherein L1< L2.
Wherein, the first ultraviolet irradiation is completed by the first mask plate. The first mask plate comprises a first shading area and a first light transmission area. The first light-shielding region corresponds to the first sub-pixel region and the third sub-pixel region to ensure that the content of the chiral compound in the part of the cholesteric liquid crystal corresponding to the first sub-pixel region and the third sub-pixel region is unchanged, namely the first pitch L1 is unchanged. The first light-transmitting area corresponds to the second sub-pixel area so as to realize independent ultraviolet irradiation on the cholesteric liquid crystal in the second sub-pixel area.
Specifically, under the irradiation of the first ultraviolet light, in the second sub-pixel area, the mass content of the chiral compound in the cholesteric liquid crystal is reduced, and the pitch of the cholesteric liquid crystal is increased. At this time, a portion of the cholesteric liquid crystal corresponding to the second sub-pixel region has a second pitch L2, and L1< L2. The part of the cholesteric liquid crystal corresponding to the second sub-pixel region is used for reflecting green light.
When the material of the cholesteric liquid crystal is fixed, the pitch of the cholesteric liquid crystal can be calculated by reflecting the central wavelength of green light, and then the mass content of the chiral compound required in the cholesteric liquid crystal in an ultraviolet irradiation area is calculated according to the pitch value. Before ultraviolet irradiation, the value of the ultraviolet product light quantity of the first ultraviolet light can be set by controlling the irradiation intensity and the irradiation time of the first ultraviolet light, and then the value of the ultraviolet product light quantity is regulated and controlled to achieve the value of the mass content of the chiral compound required in the cholesteric liquid crystal so as to obtain the value of the thread pitch L2 required by the second sub-pixel area, thereby realizing the thread pitch subarea of the first sub-pixel area and the second sub-pixel area.
B22': and performing second ultraviolet irradiation on the part of the cholesteric liquid crystal corresponding to the third sub-pixel area so that the part of the cholesteric liquid crystal corresponding to the third sub-pixel area has a third screw pitch L3, wherein L2< L3.
And finishing second ultraviolet irradiation by using a second mask plate. The second mask plate comprises a second shading area and a second light transmission area. The second light-shielding region corresponds to the first sub-pixel region and the second sub-pixel region to ensure that the content of the chiral compound in the part of the cholesteric liquid crystal corresponding to the first sub-pixel region and the second sub-pixel region is unchanged, i.e. the values of the first pitch L1 and the second pitch L2 are unchanged. The second light-transmitting area corresponds to the third sub-pixel area so as to realize independent ultraviolet irradiation on the cholesteric liquid crystal in the third sub-pixel area.
Specifically, under the irradiation of the second ultraviolet light, in the third sub-pixel area, the mass content of the chiral compound in the cholesteric liquid crystal is further reduced, and the pitch of the cholesteric liquid crystal is increased. At this time, a portion of the cholesteric liquid crystal corresponding to the third sub-pixel region has a third pitch L3, L2< L3. At this time, a portion of the cholesteric liquid crystal corresponding to the third sub-pixel region serves to reflect red light.
When the material of the cholesteric liquid crystal is fixed, the pitch of the cholesteric liquid crystal can be calculated by reflecting the central wavelength of red light, and then the mass content of the chiral compound required in the cholesteric liquid crystal in an ultraviolet irradiation area is calculated according to the pitch value. Before ultraviolet irradiation, the value of the ultraviolet product light quantity of the second ultraviolet light can be set by controlling the irradiation intensity and the irradiation time of the second ultraviolet light, and then the value of the ultraviolet product light quantity is regulated and controlled to achieve the value of the mass content of the chiral compound required in the cholesteric liquid crystal so as to obtain the pitch value L3 required by the third sub-pixel area, thereby realizing the pitch partition of the second sub-pixel area and the third sub-pixel area.
After the first ultraviolet light irradiation and the second ultraviolet light irradiation, the part of the cholesteric liquid crystal in the cholesteric liquid crystal layer corresponding to the first sub-pixel area has a first screw pitch L1, the part corresponding to the second sub-pixel area has a second screw pitch L2, the part corresponding to the third sub-pixel area has a third screw pitch L3, L1< L2< L3, and screw pitch partition of the liquid crystal display device is realized.
In the preparation method of the liquid crystal display device, the cholesteric liquid crystal in the cholesteric liquid crystal layer is irradiated by ultraviolet light, so that the pitch of the cholesteric liquid crystal can be changed, and when the cholesteric liquid crystal is in a planar state, the cholesteric liquid crystal can reflect the specific color light in the same direction as the pitch rotation direction of the cholesteric liquid crystal, so that the specific color light opposite to the pitch rotation direction of the cholesteric liquid crystal and other color light can be transmitted. When light passing through the cholesteric liquid crystal is emitted into the polarizer through the optical filter, the optical rotation direction of the polarizer is the same as the pitch rotation direction of the cholesteric liquid crystal, so that light of a specific color opposite to the optical rotation direction of the polarizer cannot pass through the polarizer, and the liquid crystal display device is in a dark state. When the cholesteric liquid crystal is in a vertical state, light penetrating through the cholesteric liquid crystal is emitted into the polarizer through the optical filter and is emitted out of the polarizer, so that the liquid crystal display device is in a bright state, and then the display picture is regulated and controlled under the driving of the array substrate. Therefore, in the liquid crystal display device prepared by the application, the cholesteric liquid crystal in the cholesteric liquid crystal layer is matched with a single polarizer, so that the use of one polarizer can be reduced on the basis of realizing the display function of the liquid crystal display device, the light attenuation phenomenon can be reduced, and the energy consumption of the liquid crystal display device can be further reduced.
The liquid crystal display device and the method for manufacturing the same provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the description of the above embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A liquid crystal display device, characterized in that the liquid crystal display device comprises:
an array substrate;
the cholesteric liquid crystal layer is arranged on the array substrate;
the color film substrate is arranged on the cholesteric liquid crystal layer and comprises an optical filter, and the optical filter is arranged opposite to the cholesteric liquid crystal layer; and
the polaroid is arranged on the color film substrate and covers the cholesteric liquid crystal layer, and the optical rotation direction of the polaroid is the same as the pitch rotation direction of cholesteric liquid crystal in the cholesteric liquid crystal layer.
2. The liquid crystal display device according to claim 1, wherein a wavelength range of light reflected by the cholesteric liquid crystal covers a wavelength range of light transmitted by the filter.
3. The lcd device of claim 1, wherein the array substrate has a plurality of pixel regions, each of the pixel regions has a first sub-pixel region and a second sub-pixel region, the color filter substrate includes a first filter and a second filter, the first filter is located in the first sub-pixel region, the second filter is located in the second sub-pixel region, and a wavelength range of light transmitted by the first filter is different from a wavelength range of light transmitted by the second filter;
the wavelength range of the light reflected by the cholesteric liquid crystal positioned in the first sub-pixel area covers the wavelength range of the light transmitted by the first optical filter, and the wavelength range of the light reflected by the cholesteric liquid crystal positioned in the second sub-pixel area covers the wavelength range of the light transmitted by the second optical filter.
4. The lcd device according to claim 3, wherein each of the pixel regions further has a third sub-pixel region, the color filter substrate further comprises a third optical filter located in the third sub-pixel region, a wavelength range of light reflected by the cholesteric liquid crystal located in the third sub-pixel region covers a wavelength range of light transmitted by the third optical filter, and the wavelength range of light transmitted by the first optical filter, the wavelength range of light transmitted by the second optical filter, and the wavelength range of light transmitted by the third optical filter are different;
the cholesteric liquid crystal in the first sub-pixel area has a first helical pitch L1, the cholesteric liquid crystal in the second sub-pixel area has a second helical pitch L2, the cholesteric liquid crystal in the third sub-pixel area has a third helical pitch L3, and L1, L2 and L3 are different.
5. The liquid crystal display device according to claim 4, wherein the first filter transmits blue light, the second filter transmits green light, and the third filter transmits red light; the cholesteric liquid crystal in the first sub-pixel region reflects blue light, the cholesteric liquid crystal in the second sub-pixel region reflects green light, the cholesteric liquid crystal in the third sub-pixel region reflects red light, and L1< L2< L3.
6. The liquid crystal display device according to claim 4, wherein the cholesteric liquid crystal comprises a nematic liquid crystal and a photoisomerization type chiral compound, and in the first sub-pixel region, the chiral compound has a first mass content M1 in the cholesteric liquid crystal; in the second sub-pixel region, the chiral compound has a second mass content M2 in the cholesteric liquid crystal; in the third sub-pixel region, the chiral compound has a third mass content M3 in the cholesteric liquid crystal; m1> M2> M3.
7. The liquid crystal display device of claim 1, wherein the array substrate has a plurality of sub-pixel regions and a plurality of spacers, and the spacers are disposed between two adjacent sub-pixel regions to form an independent space for accommodating the cholesteric liquid crystal corresponding to each sub-pixel region.
8. The liquid crystal display device according to claim 1, wherein the polarizer is a circular polarizer.
9. A method for manufacturing a liquid crystal display device is characterized by comprising the following steps:
providing a display substrate, wherein the display substrate comprises an array substrate, a color film substrate and a cholesteric liquid crystal layer arranged between the array substrate and the color film substrate, and the color film substrate comprises an optical filter arranged opposite to the cholesteric liquid crystal layer;
carrying out ultraviolet irradiation on the cholesteric liquid crystal layer;
and attaching a polarizer on the color film substrate, wherein the polarizer covers the cholesteric liquid crystal layer, and the optical rotation direction of the polarizer is the same as the pitch rotation direction of cholesteric liquid crystal in the cholesteric liquid crystal layer.
10. The method of claim 9, wherein the array substrate has a plurality of pixel regions, each of the pixel regions includes a first sub-pixel region, a second sub-pixel region and a third sub-pixel region, the cholesteric liquid crystal in the first sub-pixel region has a first pitch L1, and the step of irradiating the cholesteric liquid crystal layer with the uv light includes:
and ultraviolet light is irradiated on the cholesteric liquid crystals in the second sub-pixel area and the third sub-pixel area, so that the cholesteric liquid crystals in the second sub-pixel area have a second pitch L2, the cholesteric liquid crystals in the third sub-pixel area have a third pitch L3, and L1< L2< L3.
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| CN111679354A (en) * | 2020-06-05 | 2020-09-18 | Tcl华星光电技术有限公司 | Reflective optical filter, preparation method thereof and reflective display device |
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| CN114241933A (en) * | 2021-12-14 | 2022-03-25 | Tcl华星光电技术有限公司 | Display panel and method for manufacturing the same |
| US12025877B2 (en) | 2021-12-14 | 2024-07-02 | Tcl China Star Optoelectronics Technology Co., Ltd. | Display panel and manufacturing method thereof |
| CN115542598A (en) * | 2022-09-28 | 2022-12-30 | 惠科股份有限公司 | Electronic paper display and preparation method thereof |
| CN115542598B (en) * | 2022-09-28 | 2023-09-19 | 惠科股份有限公司 | Electronic paper display and preparation method thereof |
| WO2024103607A1 (en) * | 2022-11-14 | 2024-05-23 | 武汉华星光电技术有限公司 | Display device |
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