Preparation method of quick-response LCOS (Liquid Crystal On Silicon) liquid crystal material and LCOS device

Abstract

The invention relates to a preparation method of a quick-response LCOS liquid crystal material and an LCOS device, and the preparation method of the quick-response LCOS liquid crystal material specifically comprises the following steps: mixing 5-90% by mass of terminal alkene alkyl chain and other short-chain polycyclohexane liquid crystal monomers with 10-95% by mass of fluorine liquid crystal monomers, heating and stirring uniformly, filtering and purifying to obtain the quick-response LCOS liquid crystal material. Mixed liquid crystals are obtained. The LCOS liquid crystal material is prepared from short-chain polycyclohexane liquid crystal monomers such as an alkene-terminated alkyl chain and fluorine liquid crystal monomers, the LCOS liquid crystal material is prepared into an LCOS device, and the box thickness of the LCOS device can be effectively reduced through a reflection mode on the premise of meeting the same optical path difference, so that the response is faster, the projection video requirement of quick response can be better met, and the product quality is improved. The problems of ghosting, blurring or trailing in the projection video are solved, and the display performance and the user experience are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of LCOS liquid crystal materials, and in particular to a method for preparing a fast-response LCOS liquid crystal material and an LCOS device. Background Art

[0002] Liquid crystal materials, as the core of display technologies such as LCD and LCOS, often use biphenyl liquid crystals, phenylcyclohexane liquid crystals and ester liquid crystals, etc., and are widely used in liquid crystal devices in consumer electronic products such as televisions, mobile phones, and computers.

[0003] In order to pursue higher optical display effects and optical path difference, it is necessary to increase the thickness of the liquid crystal device box, expand the movement space of the liquid crystal molecules, and then increase the optical path difference to improve the display effect. However, the response time of the liquid crystal material is proportional to the square of the thickness of the liquid crystal device box. As the thickness of the box increases, the time required for the liquid crystal molecules to rearrange under the action of the electric field increases, resulting in a decrease in the response speed of the liquid crystal device, which may cause afterimages, blur or tailing in the projected video, affecting the user experience.

[0004] Therefore, there is an urgent need to provide a method for preparing a fast-response LCOS liquid crystal material and an LCOS device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings and defects of the prior art and provide a method for preparing a fast-response LCOS liquid crystal material and an LCOS device, aiming to solve the problems of long response time of the liquid crystal device in the prior art, which may cause afterimage, blur or tailing of the projected video.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A method for preparing a fast-response LCOS liquid crystal material comprises the following steps:

[0008] Mix short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains accounting for 5-90% by weight and fluorine liquid crystal monomers accounting for 10-95% by weight, heat and stir evenly, and then filter and purify to obtain a mixed liquid crystal.

[0009] As a preferred technical solution of the present invention, the mass proportion of the short-chain polycyclohexane liquid crystal monomers such as the terminal olefin alkyl chain is 31-40%, and the mass proportion of the fluorine-based liquid crystal monomers is 20-69%. As a preferred technical solution of the present invention, both ends of the molecular chain of the short-chain polycyclohexane liquid crystal monomers such as the terminal olefin alkyl chain are connected to an alkyl chain and an olefin group with a length of C1-C8.

[0010] As a preferred technical solution of the present invention, the short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains include one or more of terminal olefin bicyclohexane liquid crystal monomers and alkyl bicyclohexane monomer liquid crystals, and one of the structural formulas of the terminal olefin bicyclohexane liquid crystal monomers is:

[0011]

[0012] One structural formula of the alkyl bicyclohexane monomer liquid crystal is:

[0013]

[0014] As a preferred technical solution of the present invention, the fluorine-based liquid crystal monomer refers to a monomer containing one or two benzene rings in the molecular structure, and the side chain of the benzene ring carries a 2,3-difluoro group, and its end chain and bridge chain are one or more of alkoxy, alkyl, alkenyl, and oxyalkylene groups with a structure of C1-C8; wherein, when the end chain is adjacent to the 2,3-difluoro group, an alkoxy structure is preferably used.

[0015] As a preferred technical solution of the present invention, the fluorine-based liquid crystal monomer is one or more than two of the compounds represented by Ⅰ-Ⅶ, and the structural formula is as follows:

[0016]

[0017]

[0018] The present invention also provides an LCOS device, including the above-mentioned method for preparing a fast-response LCOS liquid crystal material.

[0019] As a preferred technical solution of the present invention, the LCOS device includes a glass upper substrate, a lower substrate, electronic components, and an ITO layer, an orientation layer, a liquid crystal layer, an orientation layer, a reflective layer, a light-shielding layer, and a crystalline silicon layer stacked in sequence from top to bottom between the glass upper substrate and the lower substrate, wherein the crystalline silicon layer is provided with a source level, a groove level, a capacitor diffusion, a gate, and a capacitor polysilicon, wherein the liquid crystal layer is a hybrid liquid crystal prepared by the above-mentioned preparation method.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adopts short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains and fluorine-based liquid crystal monomers to prepare LCOS liquid crystal materials, replacing traditional CN-based liquid crystal monomers, thereby significantly improving the quality of liquid crystal ions, and making the LCOS liquid crystal materials into LCOS devices. A reflection mode is adopted, and under the premise of satisfying the same optical path difference, the cell thickness of the LCOS device can be effectively reduced, so that the response is faster, the requirements of fast-response projection video can be better met, the occurrence of the afterimage phenomenon in a short time can be effectively prevented, the problem of projection video tailing is solved, and the display performance and user experience are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the LCOS device of the present invention.

[0023] The above drawings include the following reference numerals:

[0024] 100. LCOS device, 10. Glass substrate, 20. ITO layer, 30. Liquid crystal layer, 40. Orientation layer, 50. Reflection layer, 60. Light-shielding layer, 70. Crystalline silicon layer, 81. Source level, 82. Gate, 83. Trench level, 84. Capacitor diffusion, 85. Capacitor polysilicon. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0026] The specific implementation process of the present invention is as follows:

[0027] A method for preparing a fast-response LCOS liquid crystal material comprises the following steps:

[0028] Mix short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains accounting for 5-90% by weight and fluorine liquid crystal monomers accounting for 10-95% by weight, stir them evenly by heating and magnetic stirring, and then use a G5 funnel to filter and purify to remove impurities to obtain a mixed liquid crystal.

[0029] Among them, the mass proportion of short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains is preferably 31-40%, the mass proportion of fluorine-based liquid crystal monomers is preferably 20-69%, and the total mass of short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains and fluorine-based liquid crystal monomers is 100%. Both ends of the molecular chain of short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains are connected to alkyl chains and olefin groups with a length of C1-C8. Compared with saturated alkyl chains with the same number of carbon atoms, the number of H atoms in the alkyl chain is less due to the presence of olefin groups. Short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains include, but are not limited to, one or more of terminal olefin-containing bicyclohexane liquid crystal monomers and alkyl bicyclohexane monomer liquid crystals, wherein one of the structural formulas of terminal olefin-containing bicyclohexane liquid crystal monomers is:

[0030]

[0031] One structural formula of alkyl bicyclohexane monomer liquid crystal is:

[0032]

[0033] The structural formulas of terminal olefin bicyclohexane liquid crystal monomers and alkyl bicyclohexane monomer liquid crystals include but are not limited to the above-mentioned ones. Short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains have better mutual solubility and lower viscosity, and are easy to mix with fluorine-based liquid crystal monomers. Fluorine-based liquid crystal monomers are used to increase the dielectric anisotropy value and broaden the nematic phase temperature, effectively reducing the driving voltage required for liquid crystals. Fluorine-based liquid crystal monomers refer to liquid crystal monomers containing one to five benzene rings in the molecular structure, and the side chains of the benzene rings carry 2,3-difluoro groups, and the end chains and bridge chains are one or more of alkoxy, alkyl, alkenyl, and oxyalkylene groups with structures of C1-C8. The molecule may carry multiple bridge chain structures, and the bridge chain structures may be cyclohexane, -CH=N-, -N=N-, but are not limited to the above. Further, when the end chain is adjacent to 2,3-difluorophenyl, an alkoxy structure is preferred, and the interaction between the alkoxy group and the fluorine atom can further optimize the arrangement and orientation of the liquid crystal molecules and improve the performance of the liquid crystal. The present invention adopts short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains and fluorine-based liquid crystal monomers to prepare LCOS liquid crystal materials, replacing traditional CN-based liquid crystal monomers, thereby significantly improving the quality of liquid crystal ions.

[0034] The mixed liquid crystal prepared above and other components are made into an LCOS device 100. Applied in the fields of projection and AR, it has a shorter response time, can better meet the requirements of fast-response projection and AR video, and solve the problems of residual image, blur or tailing in the projection video. Figure 1As shown, the LCOS device 100 includes a glass upper substrate 10, a lower substrate, electronic components, and an ITO layer 20, an orientation layer 40, a liquid crystal layer 30, an orientation layer 40, a reflective layer 50, a light-shielding layer 60, and a crystalline silicon layer 70 stacked sequentially from top to bottom between the glass upper substrate 10 and the lower substrate, wherein the liquid crystal layer 30 is a mixed liquid crystal prepared by the above-mentioned preparation method. The glass upper substrate 10 and the lower substrate are encapsulated into a box body by colloid, and the ITO layer 20, the orientation layer 40, the liquid crystal layer 30, the orientation layer 40, the reflective layer 50, the light-shielding layer 60, and the crystalline silicon layer 70 are sequentially poured into the box body encapsulated by the glass upper substrate 10 and the lower substrate under a vacuum environment. It can also be completed by FOG process encapsulation. The crystalline silicon layer 70 is the innermost layer and is connected to the lower substrate. The crystalline silicon layer 70 is provided with a source level 81, a trench level 83, a capacitor diffusion 84, a gate 82, and a capacitor polysilicon 85 for realizing the layout of the drive circuit. The electronic components are arranged on the crystalline silicon layer 70 to facilitate the connection of the circuit. At the same time, the electronic components are arranged behind the reflective layer 50 to prevent the electronic components from blocking the light. Specifically, the light source first penetrates the glass substrate 10, and then passes through the ITO layer 20, the orientation layer 40, and the liquid crystal layer 30 in sequence. In the liquid crystal layer 30, the light is regulated and then reflected back by the reflective layer 50, and then passes through the liquid crystal layer 30, the orientation layer 40, and the ITO layer 20 again, and finally projected on the display screen to present a clear image. This process realizes the reflection mode. The light source adopts a monolithic sequential color mixing mode of different three primary color light sources, which effectively reduces the product cost. After the light passes through the liquid crystal layer 30, the light will be decomposed into red, green, and blue primary colors by the color filter. These colored lights pass through the lower polarizer, and the final output light intensity is precisely controlled by the angle between the vibration direction of the polarized light and the direction of the polarizer optical axis, thereby displaying a color image.

[0035] The specific working principle is as follows:

[0036] The incident light is reflected by the PBS prism as S light and irradiates the LCOS device 100. When the external voltage applied to a pixel of the liquid crystal layer 30 is 0V, the input S polarized light passes through the liquid crystal layer 30 without being deflected in polarization direction. After reaching the reflective layer 50, it is reflected back to output S polarized light. After being reflected by the PBS prism, the S polarized light returns along the original path and cannot enter the optical path. The light output is zero, and this pixel is in a "dark state". When the external voltage applied to this pixel is 5V, the input S polarized light passes through the liquid crystal layer 30 with being deflected in polarization direction. After reaching the reflective layer 50, it is reflected back to output P polarized light, which directly passes through the PBS prism and enters the optical path. This pixel is in a "bright state" and an image is formed on the screen.

[0037] By changing the electric field at the location of the pixel, the brightness of each pixel can be changed.

[0038] The present invention adopts short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains and fluorine-based liquid crystal monomers to prepare LCOS liquid crystal materials, and manufactures the LCOS device 100 with the LCOS liquid crystal materials. The LCOS device 100 adopts a reflection mode. Under the premise of satisfying the same optical path difference, the cell thickness of the manufactured LCOS device 100 is only half of that of the transmission mode. In view of the relationship that the response time is proportional to the square of the cell thickness, the response time of the LCOS device 100 is only one-fourth of that of the transmission mode.

[0039] The present invention will be further described below in conjunction with specific embodiments.

[0040] Embodiment 1:

[0041]

[0042]

[0043] Embodiment 2:

[0044]

[0045]

[0046] Embodiment three:

[0047]

[0048]

[0049] Based on the above embodiments 1 to 3, at room temperature: using the reflection mode, the response time of the LCOS device 100 is as follows:

[0050] Ton(ms) Toff(ms) T(ms) Frequency (Hz) High and low voltage (V) 0.24 3.2 3.44 128 5 and 0

[0051] Ton is the response time of the LCOS device after power is applied, Toff is the response time of the LCOS device 100 after power is removed, T is the sum of the two, 0V refers to the low voltage end, and 5V represents the high voltage end.

[0052] Conventional LCD devices have a response time of more than 30ms. The liquid crystal material prepared by the present invention makes the LCOS device 100 an order of magnitude faster and more responsive, which can better meet the requirements of fast-response projection video and solve the problems of residual image, blur or tailing in projection video. It can be widely used in projection, AR, HUD, 3D printing and scanning, optical fiber transmission, head-mounted display, aerospace remote sensing, medical diagnosis and other fields.

[0053] The above-mentioned embodiments only express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for preparing a fast-response LCOS liquid crystal material, characterized in that: The following steps are involved: Mix short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains accounting for 5-90% by weight and fluorine liquid crystal monomers accounting for 10-95% by weight, heat and stir evenly, and then filter and purify to obtain a mixed liquid crystal.

2. The method for preparing a fast response LCOS liquid crystal material according to claim 1, characterized in that: The weight proportion of the short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains is 31-40%, and the weight proportion of the fluorine-based liquid crystal monomers is 20-69%.

3. The method for preparing a fast response LCOS liquid crystal material according to claim 1, characterized in that: Both ends of the molecular chain of the short-chain polycyclohexane liquid crystal monomer such as the terminal olefin alkyl chain are connected to an alkyl chain and an olefin group with a length of C1-C8.

4. The method for preparing a fast response LCOS liquid crystal material according to claim 1, characterized in that: The short-chain polycyclohexane liquid crystal monomers such as terminal olefin alkyl chains include one or more of terminal olefin bicyclohexane liquid crystal monomers and alkyl bicyclohexane monomer liquid crystal monomers. One of the structural formulas of the terminal olefin bicyclohexane liquid crystal monomers is: One of the structural formulas of the alkyl bicyclohexane monomer liquid crystal is:

5. The method for preparing a fast response LCOS liquid crystal material according to claim 1, characterized in that: The fluorine-based liquid crystal monomer refers to a monomer containing one to five benzene rings in the molecular structure, and the side chain of the benzene ring carries a 2,3-difluoro group, and the end chain and bridge chain are one or more of alkoxy, alkyl, alkenyl, and oxyalkylene groups with a structure of C1-C8.

6. The method for preparing a fast response LCOS liquid crystal material according to claim 1, characterized in that: The fluorine-based liquid crystal monomer is one or more than two of the compounds represented by Ⅰ-Ⅶ, and the structural formula is as follows:

7. An LCOS device, characterized in that: A method for preparing a fast-response LCOS liquid crystal material comprising the method described in any one of claims 1-6.

8. The LCOS device according to claim 7, characterized in that: It includes a glass upper substrate, a lower substrate, electronic components, and an ITO layer, an orientation layer, a liquid crystal layer, an orientation layer, a reflective layer, a light-shielding layer, and a crystalline silicon layer stacked in sequence from top to bottom between the glass upper substrate and the lower substrate. The crystalline silicon layer is provided with a source level, a trench level, a capacitor diffusion, a gate, and capacitor polysilicon, wherein the liquid crystal layer is a hybrid liquid crystal prepared by the above preparation method.

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