阅读说明：本技术 一种高色彩高饱和度反射式偏光板 (High-color high-saturation reflective polarizing plate ) 是由 丁清华 顾亮 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种高色彩饱和度反射式偏光板,包括由下至上依次设置的下基材层、功能层和上基材层,所述功能层按重量百分比包括以下组分：75～90％反应型液晶、5～20％手性剂、3～5％光引发剂、0.5～5％量子点材料。本发明的功能层配方里不需额外添加扩散粒子,利用反射式偏光板本身允许光线多次循环,借此来起到增加光行程,提高量子点激发效率的效果。由于没有扩散粒子的存在,功能层不具有雾度,可同时提高画面光强度。(The invention discloses a high-color-saturation reflective polarizing plate, which comprises a lower substrate layer, a functional layer and an upper substrate layer which are sequentially arranged from bottom to top, wherein the functional layer comprises the following components in percentage by weight: 75-90% of reactive liquid crystal, 5-20% of chiral agent, 3-5% of photoinitiator and 0.5-5% of quantum dot material. The functional layer formula of the invention does not need to add additional diffusion particles, and the reflective polarizing plate allows light to be circulated for multiple times, thereby achieving the effects of increasing light stroke and improving the excitation efficiency of quantum dots. Because the existence of no diffusion particles is avoided, the functional layer has no haze, and the light intensity of the picture can be improved at the same time.)

1. The utility model provides a high color saturation reflective polarizing plate which characterized in that includes lower substrate layer, functional layer and the last substrate layer that sets gradually by supreme down, the functional layer includes following component according to weight percent: 75-90% of reactive liquid crystal, 5-20% of chiral agent, 3-5% of photoinitiator and 0.5-5% of quantum dot material, wherein the quantum dot material comprises a red quantum dot material and a green quantum dot material in a weight ratio of 1: 1.

2. The high color saturation reflective polarizing plate according to claim 1, wherein the upper and lower substrates are water and air barrier films.

3. The high color saturation reflective of claim 1The transmission type polarizing plate is characterized in that the chiral agent is selected from Any one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; y is a cholesterol group,

4. The high color saturation reflective polarizer according to claim 1, wherein said reactive liquid crystal comprises a monofunctional liquid crystal and a multifunctional liquid crystal, said multifunctional liquid crystal is a difunctional liquid crystal, and the weight ratio of said monofunctional liquid crystal to said difunctional liquid crystal is 1: 1.

5. The high color saturation reflective polarizing plate according to claim 4, wherein said monofunctional liquid crystal is selected from the group consisting of Any one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; ar is a group having a liquid crystalline phase selected from Any one of (a); x is C₁～C₁₀Alkoxy or C₁～C₁₀One end group of the long-chain alkyl.

6. The high color saturation reflective polarizer according to claim 4, wherein said difunctional liquid crystal is selected from the group consisting of

7. The high color saturation reflective polarizing plate according to claim 1, wherein the functional layer has a spiral arrangement structure, and an optical axis of the spiral arrangement structure is perpendicular to the functional layer; the helical arrangement structure has pitches with different sizes, and the pitch sizes have continuous or discontinuous changes from large to small or from small to large.

8. The high color saturation reflective polarizing plate according to claim 1, wherein the functional layer comprises the following components in weight percent: 75-90% of reactive liquid crystal, 5-20% of chiral agent, 3-5% of photoinitiator and 1-2% of quantum dot material.

Technical Field

The invention belongs to the technical field of liquid crystal displays, and particularly relates to a high-color high-saturation reflective polarizing plate.

Background

Liquid crystal displays have lower color saturation than OLED technology due to material limitations. In order to improve the color saturation of LCD-type displays, various techniques have been proposed, such as improvement of filter materials, improvement of LED phosphors, and use of quantum dot films.

The quantum dot film needs to be matched with a blue light LED, and red and green light quantum dot materials are excited by the blue light to obtain narrow-band RGB mixed white light. In design, in order to improve the excited efficiency of the quantum dots, diffusion particles are often added into a coating formula to increase the light path way so that the quantum dots have more excited opportunities.

In order to improve the light utilization efficiency of the LCD display, a reflective polarizer may be optionally used in the backlight module. There are two main types of reflective polarizer technologies: the result of 3M multilayer film technology, or cholesteric liquid crystal films, is to allow only a single polarization direction of light to pass through and reflect light of the other polarization direction. The reflected light returns to the backlight module and then can be reversed by the reflector plate to readjust the polarization direction. The light circulated to most of the light is adjusted to pass through the polarized light and passes through the reflective polarizer.

For the type of reflective polarizer made of cholesteric liquid crystal film, nematic liquid crystal polymer is generally used, and chiral agent is used to obtain the required cholesteric liquid crystal phase material formulation. When the film is manufactured, the cholesteric liquid crystal molecules are spirally arranged along the light passing direction of the film by using process control. The pitch size of the helical arrangement corresponds to the wavelength of the light to be applied.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a high-color high-saturation reflective polarizing plate.

In order to solve the technical problems, the invention provides the following technical scheme:

the invention provides a high-color high-saturation reflection type polarizing plate which comprises a lower substrate layer, a functional layer and an upper substrate layer which are sequentially arranged from bottom to top, wherein the functional layer comprises the following components in percentage by weight: 75-90% of reactive liquid crystal, 5-20% of chiral agent, 3-5% of photoinitiator and 0.5-5% of quantum dot material, wherein the quantum dot material comprises a red quantum dot material and a green quantum dot material in a weight ratio of 1: 1.

As a preferred technical solution of the present invention, the upper substrate and the lower substrate are water vapor barrier films.

As a preferred technical scheme of the invention, the chiral agent is selected fromAndany one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; y is a cholesterol group,

And

an optically active group capable of forming a helical nematic liquid crystal phase; ar is a group having a liquid crystalline phase selected from

Any one of the above.

As a preferred technical scheme of the invention, the reactive liquid crystal comprises monofunctional liquid crystal and multifunctional liquid crystal, preferably, the multifunctional liquid crystal is bifunctional liquid crystal, and the weight ratio of the monofunctional liquid crystal to the bifunctional liquid crystal is 1: 1.

As a preferred technical scheme of the invention, the monofunctional liquid crystal is selected fromAny one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; ar is a group having a liquid crystalline phase selected from

Any one of (a); x is C₁～C₁₀Alkoxy or C₁～C₁₀One end group of the long-chain alkyl.

As a preferred technical scheme of the invention, the difunctional liquid crystal is selected from Any one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; ar is a group having a liquid crystalline phase selected from

Any one of the above.

As a preferred technical solution of the present invention, the functional layer has a spiral arrangement structure, and an optical axis of the spiral arrangement structure is perpendicular to the functional layer; the helical arrangement structure has pitches with different sizes, and the pitch sizes have continuous or discontinuous changes from large to small or from small to large.

As a preferred technical scheme of the invention, the functional layer comprises the following components in percentage by weight: 75-90% of reactive liquid crystal, 5-20% of chiral agent, 3-5% of photoinitiator and 1-2% of quantum dot material.

Compared with the prior art, the invention has the following beneficial effects: the functional layer formula of the invention does not need to add additional diffusion particles, and the reflective polarizing plate allows light to be circulated for multiple times, thereby achieving the effects of increasing light stroke and improving the excitation efficiency of quantum dots. Because the existence of no diffusion particles is avoided, the functional layer has no haze, and the light intensity of the picture can be improved at the same time.

Drawings

FIG. 1 is a schematic structural diagram of a high-color high-saturation reflective polarizer according to the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

As shown in fig. 1, the present invention provides a high-color high-saturation reflective polarizing plate, which comprises a lower substrate layer 1, a functional layer 2 and an upper substrate layer 3, which are sequentially arranged from bottom to top, wherein the functional layer 2 comprises the following components by weight: 75-90% of reactive liquid crystal, 5-20% of chiral agent, 3-5% of photoinitiator and 0.5-5% of quantum dot material. The quantum dot material comprises a red quantum dot material and a green quantum dot material in a weight ratio of 1: 1.

In the invention, a reaction type liquid crystal and a single chiral agent form a spiral arrangement structure under the condition of the same reaction rate, so as to obtain a colored reflective polarizing plate with a part of visible light wave band; or reacting the reactive liquid crystal with a single chiral agent or a plurality of chiral agents, wherein the liquid crystal obtained by the difference of the reaction rate and the difference of the concentration of the chiral agents is spirally arranged, and the pitch of the reflection waveband spiral arrangement structure of the reflection type polarizing plate prepared by the liquid crystal is changed, so that the wide waveband reflecting layer with the gradually changed pitch can be obtained by the polymerization speed difference caused by the exposure intensity and the concentration.

The skilled person can select the chiral agent according to the actual situation, and in order to make the chiral agent react with the reactive liquid crystal to form the cholesteric liquid crystal better, the chiral agent is preferably selected from

Any one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; y is a cholesterol group,And

an optically active group capable of forming a helical nematic liquid crystal phase; ar is a group having a liquid crystalline phase selected from Any one of the above.

The reactive liquid crystal comprises monofunctional liquid crystal and multifunctional liquid crystal, preferably, the multifunctional liquid crystal is bifunctional liquid crystal, and the weight ratio of the monofunctional liquid crystal to the bifunctional liquid crystal is 1: 1. On the one hand, if reaction type liquid crystal only contains monofunctional group liquid crystal, then can lead to reaction rate slower, the solidification is incomplete, hardness and anti ability of scraping are relatively poor, and on the other hand, if reaction type liquid crystal only contains polyfunctional group liquid crystal, then there will be the shrink serious again, and the hardness is higher, and resilience performance is relatively poor, the problem of not scraping resistant, consequently, make reaction type liquid crystal include monofunctional group liquid crystal and polyfunctional group liquid crystal simultaneously and can control reaction rate, make the polarizing plate have excellent resistant resilience performance of scraping.

The skilled person can also select the types of the above monofunctional liquid crystal and the above multifunctional liquid crystal appropriately according to the actual situation, and in order to make the chiral agent react with the reactive liquid crystal better to form the cholesteric liquid crystal, the monofunctional liquid crystal is preferably selected fromAnd

any one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; ar is a group having a liquid crystalline phase selected from

Any one of (a); x is C₁～C₁₀Alkoxy or C₁～C₁₀One end group of the long-chain alkyl.

Preferably, the difunctional liquid crystal is selected from

Any one or more of; wherein R is C₁～C₁₀Alkylene or C₁～C₁₀An alkyleneoxy group; ar is a group having a liquid crystalline phase selected from

Any one of the above.

Preferably, the functional layer has a spiral arrangement structure, and an optical axis of the spiral arrangement structure is perpendicular to the functional layer; the helical arrangement structure has pitches with different sizes, and the pitch sizes have continuous or discontinuous changes from large to small or from small to large.

Preferably, the functional layer comprises the following components in percentage by weight: 75-90% of reactive liquid crystal, 5-20% of chiral agent, 3-5% of photoinitiator and 1-2% of quantum dot material.