阅读说明：本技术 一种液晶激光显示面板及其构建方法 (Liquid crystal laser display panel and construction method thereof ) 是由 赵永生 徐法峰 姚建年 于 2019-02-18 设计创作，主要内容包括：本发明公开了一种液晶激光显示面板及其构建方法。该面板包括周期性排布的RGB像素阵列,所述RGB像素阵列包括聚合物微模板和液晶微结构；所述聚合物微模板作为空白像素,所述液晶微结构位于所述聚合物微模板内部；其中,所述液晶微结构包含液晶材料和有机激光染料分子。液晶微激光像素阵列具有周期性排布特点,易于实现混色的激光输出,易于在特定激发方式下实现全色的激光显示。(The invention discloses a liquid crystal laser display panel and a construction method thereof. The panel comprises RGB pixel arrays which are periodically arranged, wherein each RGB pixel array comprises a polymer micro-template and a liquid crystal microstructure; the polymer micro-template is used as a blank pixel, and the liquid crystal micro-structure is positioned in the polymer micro-template; wherein the liquid crystal microstructure comprises a liquid crystal material and organic laser dye molecules. The liquid crystal micro laser pixel array has the characteristic of periodic arrangement, is easy to realize laser output of color mixing, and is easy to realize full-color laser display in a specific excitation mode.)

1. The liquid crystal laser display panel is characterized by comprising an RGB pixel array which is periodically arranged, wherein the RGB pixel array comprises a polymer micro-template and a liquid crystal microstructure; the polymer micro-template is used as a blank pixel, and the liquid crystal micro-structure is positioned in the polymer micro-template; wherein the liquid crystal microstructure comprises a liquid crystal material and organic laser dye molecules.

2. The liquid crystal laser display panel according to claim 1, wherein the liquid crystal material is a mixture of a liquid crystal and a chiral agent; preferably, the mass ratio of the liquid crystal to the chiral agent is 100 (1-30);

preferably, the liquid crystal is selected from at least one of nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal and discotic liquid crystal, preferably nematic liquid crystal;

preferably, the chiral agent is selected from at least one of a levorotatory chiral agent and a dextrorotatory chiral agent, preferably a dextrorotatory chiral agent;

preferably, the organic laser dye molecules are selected from one, two or three of oligostyrene dyes (o-MSB), coumarin dyes (C30) and 4- (dimethylene) -2-methyl-6- (4-dimethylaminostyryl) -4-hydro-furan (DCM);

preferably, the mass ratio of the liquid crystal material to the organic laser dye molecules is 100 (0.5-3).

3. The liquid crystal laser display panel according to claim 1 or 2, wherein the periodic arrangement is an arrangement of RGB pixel array units in sequence, the RGB pixel array units being composed of an R array, a G array, and a B array arranged in sequence.

4. The liquid crystal laser display panel according to any of claims 1 to 3, wherein the polymer micro-template is prepared by spin-coating an organic solution of a polymer on a magnesium fluoride substrate by etching;

preferably, the polymer is polymethyl methacrylate, and the organic solution is chlorobenzene;

preferably, the concentration of the organic solution of the polymer is 0.05-0.5 g/mL;

preferably, the etching is electron beam etching.

5. The method of fabricating a liquid crystal laser display panel according to any one of claims 1 to 4, comprising the steps of:

(1) injecting printing ink into the polymer micro-template, and printing to obtain an RGB pixel array;

(2) under the excitation of laser, the sub-pixels in the RGB pixel array emit single-mode RGB laser and mixed-color laser, and the liquid crystal laser display panel is obtained.

6. The method for fabricating a liquid crystal laser display panel according to claim 5, wherein in the step (1), the printing ink comprises a liquid crystal material and organic laser dye molecules, the liquid crystal material has the meaning of claim 1 or 2, and the organic laser dye molecules have the meaning of claim 1 or 2;

preferably, the printing ink comprises printing ink one, printing ink two and printing ink three;

preferably, the printing is contact substrate printing; preferably, the printing comprises the steps of: a. controlling the micro-operation arm to move the glass needle on the micro-operation arm to be above the printing ink; b. operating the mechanical arm to enable the needle head to be inserted into the printing ink, and sucking the printing ink into the needle head by utilizing the capillary action; c. and lifting the needle head to the position above the polymer micro-template, setting a release voltage of 0.5-3.0V, and injecting the printing ink into the micro-template.

7. The method for fabricating a liquid crystal laser display panel according to claim 5 or 6, wherein in the step (1), the printing inks are injected into the polymer micro-template in a row;

preferably, the R array, the G array and the B array are printed, the R array, the G array and the B array are RGB pixel array units, and three adjacent RGB pixels in the same row form sub-pixels of the RGB pixel array.

8. The method as claimed in any one of claims 5 to 7, wherein in the step (2), the laser is a femtosecond laser with a wavelength of 380-420 nm.

9. The method of claim 7 or 8, wherein in the step (2), when the sub-pixels are individually activated, single-mode RGB laser emission is obtained. Obtaining mixed-color laser light when exciting different sub-pixel combinations;

preferably, the laser emission of the mixed color includes laser emission of at least one of cyan (BG mixed color), orange (GR mixed color), magenta (BR mixed color), and white (RGB mixed color).

10. The method for fabricating the liquid crystal laser display panel according to any one of claims 7 to 9, wherein in the step (2), the digital micromirror device is used to control the position of laser excitation, and the excitation position is designed into a specific pattern, thereby realizing selective excitation of different sub-pixels of the polymer micro-template;

preferably, the specific pattern is edited in software associated with the digital micromirror element, resulting in a different excitation mask.

Technical Field

The invention belongs to the field of laser display, and particularly relates to a liquid crystal laser display panel and a construction method thereof.

Background

Laser display, which utilizes the characteristics of high monochromaticity and high brightness of laser emission, has become a revolutionary technology in the display industry due to its wide gamut coverage, high color saturation and high color contrast ratio. The application of laser display technology to portable display devices has been hampered by the lack of suitable full color display panels. Therefore, it is of great significance to develop a structure capable of realizing pixelation of full-color laser emission. One effective strategy is to construct a periodic laser array as a display panel using red, green, blue (RGB) microlasers as elementary pixels. To date, RGB laser arrays have been demonstrated by various schemes such as printing-type array preparation schemes, chemical vapor deposition array preparation schemes, and template-assisted liquid-phase self-assembly array preparation schemes, etc., which can be used as color laser display panels.

However, due to material compatibility and complex fabrication technology issues, integrating RGB laser arrays on a single panel to achieve full color laser displays remains a significant challenge.

Disclosure of Invention

The invention provides a liquid crystal laser display panel, which comprises an RGB pixel array which is periodically arranged, wherein the RGB pixel array comprises a polymer micro-template and a liquid crystal micro-structure; the polymer micro-template is used as a blank pixel, and the liquid crystal micro-structure is positioned in the polymer micro-template; wherein the liquid crystal microstructure comprises a liquid crystal material and organic laser dye molecules.

According to the liquid crystal laser display panel, the liquid crystal material is a mixture of liquid crystal and a chiral agent. For example, the liquid crystal may be at least one of nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, and discotic liquid crystal, and by way of example, the liquid crystal may be nematic liquid crystal, for example, the liquid crystal may be E7, purchased from shijia honest-and-memorable-perpetuation display materials ltd. For example, the chiral agent may be at least one of a left-handed chiral agent and a right-handed chiral agent, and the chiral agent is a right-handed chiral agent, for example, the chiral agent may be R811, purchased from shijiazhuang honest Yonghua display materials, ltd. Wherein, the mass ratio of the liquid crystal to the chiral agent in the liquid crystal material can be 100 (1-30), such as 100 (5-20); as an example, the mass ratio may be 100:5 (denoted as LC-1), 100:12 (denoted as LC-2), 100:20 (denoted as LC-3). As an example, the liquid crystal material can be obtained by doping the liquid crystal E7 with the chiral agent R811 in the above-described ratio.

Examples of the liquid crystal E7 include cyanobiphenyls such as 2-cyanobiphenyl, 4-cyano-4' -pentylbiphenyl, and the like.

The chiral agent R811 includes, for example, 4- (4' -hexyloxy) benzoyloxybenzoic acid- (R) - (-) -2 octyl alcohol ester, the structural formula of which is shown below:

according to the liquid crystal laser display panel of the present invention, the organic laser dye molecules may be selected from one, two or more of oligostyrene type dye (o-MSB), coumarin type dye (C30), 4- (dimethylene) -2-methyl-6- (4-dimethylaminostyryl) -4 h-furan (DCM), and the like. For example, the mass ratio of the liquid crystal material to the organic laser dye molecules may be 100 (0.5-3), such as 100 (1-2); as an example, the mass ratio may be 100:1, 100:1.5, 100: 1.2.

According to the liquid crystal laser display panel, the periodic arrangement may be that RGB pixel array units are sequentially arranged, and the RGB pixel array units are composed of an R array, a G array, and a B array, which are sequentially arranged.

According to the liquid crystal laser display panel of the invention, the RGB pixel array may be a square structure, such as a horizontal and vertical parallel N × N array.

According to the liquid crystal laser display panel, the liquid crystal microstructure can be used as a micro laser pixel.

The invention also provides a construction method of the liquid crystal laser display panel, which comprises the following steps:

(1) injecting printing ink into the polymer micro-template, and printing to obtain an RGB pixel array;

(2) under the excitation of laser, the sub-pixels in the RGB pixel array emit single-mode RGB laser and mixed-color laser, and the liquid crystal laser display panel is obtained.

According to the method of the invention, in step (1), the printing ink comprises a mixture of liquid crystal material and organic laser dye molecules; the liquid crystal material and the organic laser dye molecules have the meaning and the proportion as described above.

For example, the printing ink includes printing ink one, printing ink two, and printing ink three. By way of example, the printing ink one comprises a liquid crystal material one and an organic laser dye one, wherein the liquid crystal material one can be LC-1, and the organic laser dye one can be o-MSB. For example, the second printing ink comprises a second liquid crystal material and a second organic laser dye, the second liquid crystal material may be LC-2, and the second organic laser dye may be C30. For example, the printing ink three comprises a liquid crystal material three and an organic laser dye three, wherein the liquid crystal material three can be LC-3, and the organic laser dye three can be DCM.

According to the method of the present invention, in step (1), the polymer micro-template may be prepared by spin-coating an organic solution of a polymer on a magnesium fluoride substrate, and etching the solution. For example, the polymer may be polymethyl methacrylate. For example, the organic solution is a chlorobenzene solution. For example, the concentration of the organic solution of the polymer (e.g., a solution of polymethyl methacrylate in chlorobenzene) can be 0.05-0.5g/mL, such as 0.08-0.3g/mL, and as an example, the concentration can be 0.1g/mL, 0.2 g/mL. For example, the etching may be electron beam etching. The polymer micro-template may be polygonal in shape, and illustratively, square in shape. The polymer micro-template may have a side length of 10-100 microns, illustratively 50 microns.

According to the method of the present invention, in the step (1), the printing may be contact-based printing. The printing may comprise the steps of: a. controlling the micro-operation arm to move a glass needle (for example, the glass needle is an inverted conical hollow glass needle point with an opening at the lower end, and the inner diameter of the needle point can be 5-20 micrometers, and is 10 micrometers as an example) on the micro-operation arm to be above the printing ink; b. operating the mechanical arm to enable the needle head to be inserted into the printing ink, and sucking the printing ink into the needle head by utilizing the capillary action; c. and lifting the needle head to the position above the polymer micro-template, setting a certain release voltage, and injecting the sample into the micro-template. Wherein the release voltage may be 0.5-3.0V, such as 0.8-2.0V, and as an example, the release voltage may be 1.0V.

According to the method of the invention, in step (1), the printing inks may be injected into the polymeric micro-template in columns. For example, an R array is printed first, then a G array is printed, then a B array is printed, and the R array, the G array, and the B array obtained by printing in sequence are RGB pixel array units. And the three adjacent RGB pixels in the same row form the sub-pixels of the RGB pixel array.

According to the method of the present invention, in the step (2), the laser may be a femtosecond laser with a wavelength of 380-420nm, such as 390-401nm, for example, 400 nm.

According to the method of the present invention, in step (2), when the sub-pixels are individually excited, single-mode RGB laser emission can be obtained. When different sub-pixel combinations are excited, laser with mixed colors can be obtained; the laser emission of the mixed color includes laser emission of at least one of cyan (BG mixed color), orange (GR mixed color), magenta (BR mixed color), and white (RGB mixed color).

According to the method of the present invention, in step (2), the position of laser excitation can be controlled by using a digital micromirror device, and the excitation position is designed into a specific pattern, thereby realizing the selective excitation of different sub-pixels of the polymer micro-template. Further, the specific pattern can be edited in software associated with the digital micromirror element, resulting in different excitation masks.

The invention has the beneficial effects that:

1. the invention provides a liquid crystal laser display panel, which comprises a polymer micro-template used as a blank pixel and a liquid crystal microstructure injected into the micro-template by ink-jet printing; the liquid crystal microstructure comprises a liquid crystal material and organic laser dye molecules doped in the liquid crystal material. The liquid crystal material provides a distributed optical feedback resonant cavity required by laser emission, and the organic laser dye molecules provide optical gain. The liquid crystal material with the distributed optical feedback function has excellent material compatibility and is easy to be mixed with organic laser dye molecules with optical gain; the organic laser dye molecule-doped liquid crystal microstructure with optical gain can form a micro-nano resonant cavity, effective optical oscillation is easy to realize, and low-threshold laser mode output is facilitated; the organic laser dye molecule doped liquid crystal microstructure with optical gain can also realize the emission of single-mode laser through distributed optical feedback, form high-purity laser, and is beneficial to realizing the color display with wide color gamut and high saturation. The liquid crystal material doped with organic laser dye molecules has excellent flowing property, and is easy to inject into a specific template to realize display pixels with specific shapes; the liquid crystal material doped with organic laser dye molecules has excellent processing performance, and is easy to realize the preparation of a liquid crystal micro laser pixel array by a printing technology and the construction of a laser display panel; the liquid crystal micro laser pixel array has the characteristic of periodic arrangement, is easy to realize laser output of color mixing, and is easy to realize full-color laser display in a specific excitation mode.

In the liquid crystal microstructure doped with organic laser dye molecules, the organic optical gain dye and the liquid crystal distributed feedback resonant cavity are mixed together in a doping mode, and the mixture is uniform and stable, so that the liquid crystal micro laser pixel with a stable structure can be obtained, the light emitted by the optical gain dye can be effectively resonated in the liquid crystal microstructure, and the low-threshold laser emission can be realized.

In the liquid crystal micro laser pixel, liquid crystal provides a distributed feedback resonant cavity, and the light emission of the organic optical gain dye realizes effective distributed feedback resonance and single-mode laser emission with high color purity.

In the liquid crystal micro laser pixel, pixels emitting laser with different colors can be combined to emit light, so that multi-color mixing is realized, and multi-color laser pattern display can be realized.

In the liquid crystal micro laser pixel array, the selective mask excitation of the digital micro mirror element can be used for realizing the display of specific graphic patterns and realizing the laser display of single color, multiple colors and full color.

2. The invention also provides a preparation method of the liquid crystal laser display panel, which has the advantages of low cost, simple method, environmental friendliness and large-scale preparation.

Drawings

FIG. 1 is a characteristic diagram of the liquid crystal material used in example 1 of the present invention.

FIG. 2 is a graph showing the properties of organic laser dye molecules used in example 1 of the present invention.

Fig. 3 is a schematic view of a process for manufacturing a liquid crystal laser display panel according to embodiment 1 of the present invention.

Fig. 4 is a characterization diagram of laser emission properties of a liquid crystal micro-laser pixel in embodiment 1 of the invention.

Fig. 5 is a representation diagram of the full-color laser color mixing provided in embodiment 1 of the present invention.

Fig. 6 is a schematic diagram of laser display of a specific pattern provided in embodiment 1 of the present invention.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.

Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.

Digital micromirror device: based on a digital micromirror device developed by TI (Texas instruments, USA) corporation, model number DLP470 NE.

Liquid crystal E7: purchased from Shijiazhuang Chengninghua display materials, Inc.

Chiral agent R811: purchased from Shijiazhuang Chengninghua display materials, Inc.

The liquid crystal material is obtained by doping a chiral agent R811 into liquid crystal E7, wherein the mass ratio of E7 to R811 in LC-1 is 100:5, the mass ratio of E7 to R811 in LC-2 is 100:12, and the mass ratio of E7 to R811 in LC-3 is 100: 20.