CN112126299A - Optical coating for projection screen for laser TV and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of projection screen manufacturing, and particularly relates to a projection screen optical coating for a laser television and a preparation method thereof. The optical coating for the projection screen of the laser television comprises the following components in percentage by mass: 10-15% of reflective powder; 18-21% of barium sulfate; 15-20% of titanium dioxide; 1-5% of polymethyl methacrylate micro powder; 3-8% of spherical organic silicon powder; 3-8% of electroplated aluminum glass microspheres; 0.5-3% of sodium carboxymethylcellulose; 20-30% of water-based acrylic resin; 12-18% of water. The optical coating prepared by the invention is applied to the white screen, so that the brightness, the definition, the gain and the contrast of the white screen are close to those of a special laser composite screen, the light visible angle is large, and the application range of the white screen is greatly expanded.

Description

Optical coating for projection screen for laser TV and preparation method thereof

technical field

The invention belongs to the technical field of projection screen manufacturing, and in particular relates to an optical coating for a laser TV projection screen and a preparation method thereof.

Background technique

TV technology has experienced three technical iterations of black and white TV, color TV and digital TV represented by LCD TV, PDP, OLED, etc., while laser TV is the fourth generation. Laser TV has the advantages of large format, high brightness, high resolution and high resolution. It uses a laser light source. Of course, it needs an anti-light gain screen to match it.

Laser TVs are often equipped with two types of anti-light gain screens, Fresnel or black grid. From the perspective of the efficiency of light reflection on the screen, the Fresnel anti-light gain screen gathers projection light by using an optical filter structure similar to concentric circles. , has the function of increasing vision and improving efficiency, but the Fresnel anti-light gain screen has directional requirements during the installation process. The concentric circle of the Fresnel optical structure should be facing the lens of the laser TV, so when we carefully observe the actual It is not difficult to find that not all Fresnel screens can have excellent picture restoration ability. The traditional white screen has the characteristics of easy installation, but the brightness gain of the traditional white screen is low. Generally speaking, the standard white screen with diffuse reflection structure has a gain of 1.0, and the gain of the Fresnel anti-light gain screen is larger than 1.0. It means that it can retain more projector brightness on the screen than the standard white screen, so if the gain of the traditional white screen can be increased, it can be close to the gain of the Fresnel anti-light gain screen, or even greater than that of the Fresnel anti-light gain screen. The gain of the Nell anti-light gain screen can replace the Fresnel anti-light gain screen.

At present, an optical coating technology has appeared in the prior art, and an optical coating is obtained by coating on a traditional white screen, which has the effect of high gain. For example, Chinese patent CN107144901A discloses a method for preparing an optical paste film and an optical film. The method includes: step 1, providing a substrate, and coating one side of the substrate with a layer of the prepared first paste; step 2, in the first The second slurry prepared by brushing on the slurry; wherein, the first slurry comprises a slurry main body mixed with a first solvent; the second slurry is mainly composed of a film-forming agent, a defoamer, a surfactant and The second solvent, the coupling agent and the dispersing agent are mixed and stirred to prepare and synthesize. However, the composite coating consists of two layers, and the process is relatively complicated. At the same time, some existing technologies require 4 to 5 layers to achieve the desired effect, which greatly limits the development of optical coatings.

SUMMARY OF THE INVENTION

The present invention aims to provide an optical coating for a projection screen of a laser TV and a preparation method thereof. The present invention prepares an optical coating which, when applied behind a white screen, makes the brightness, clarity, gain and contrast of the white screen close to The special laser composite screen cloth has a viewing angle of more than 140°, which greatly expands the scope of use of the white screen.

In order to achieve the above object, the present invention adopts the following technical solutions:

An optical coating for a projection screen for a laser TV, comprising the components in the following mass fractions:

Reflective powder 10-15%;

Barium sulfate 18～21%;

Titanium dioxide 15～20%;

Polymethyl methacrylate micropowder 1～5%;

Spherical silicone powder 3～8%;

Electroplated aluminum glass microspheres 3～8%;

Sodium carboxymethyl cellulose 0.5-3%;

Water-based acrylic resin 20-30%;

Water 10 to 18%.

In the present invention, titanium dioxide and barium sulfate play a reflective role, reflective powder and electroplated aluminum glass microspheres play a gain role, and polymethyl methacrylate micropowder and spherical organic silicon powder play a scattering role.

Further, the following mass fractions of components are included:

Reflective powder 12%;

Barium sulfate 20%;

Titanium dioxide 17%;

Polymethyl methacrylate micropowder 2%;

Spherical silicone powder 5%;

Electroplated aluminum glass microspheres 6%;

Sodium carboxymethyl cellulose 1%;

Water-based acrylic resin 25%;

Water 12%.

Further, the particle size of the reflective powder is 5-15 μm.

Further, the particle size of the barium sulfate is 15-200 μm.

Further, the particle size of the titanium dioxide is 20-80 μm.

Further, the particle size of the polymethyl methacrylate micropowder is 1.5-3 μm.

Further, the particle size of the spherical organosilicon powder is 1-3 μm.

Further, the spherical organosilicon powder is spherical polymethylsilsesquioxane.

Further, the particle size of the electroplated aluminum glass microspheres is 5-15 μm.

Further, the electroplated aluminized glass microspheres are coated with a layer of metal aluminum on the outer surface of the glass microspheres, and the thickness of the metal aluminum is 0.5-1 μm.

Another object of the present invention is to provide the preparation method of the optical coating for the projection screen for the laser TV, comprising the following steps:

S1) after mixing the polymethyl methacrylate micropowder and spherical silicone powder, add it to the water-based acrylic resin, then add water, and ultrasonically disperse for 10 to 15 minutes to obtain a mixed solution;

S2) Mix and stir the reflective powder, barium sulfate, titanium dioxide, electroplated aluminum glass microspheres and sodium carboxymethyl cellulose, add to the mixed solution in step S1, and mechanically stir for 5 to 10 minutes to obtain the result.

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

(1) The present invention has prepared an optical paint. Experiment 1 shows that the optical paint is painted behind a white screen, so that the brightness, clarity, gain and contrast of the white screen are close to the special laser composite screen cloth.

(2) The optical paint of the present invention can be brushed in a single layer. Experiment 2 shows that the visual angle of the optical paint applied behind the white screen is large, reaching more than 140°.

Detailed ways

The above-mentioned content of the present invention will be further described in detail below through the specific implementation in the form of examples. However, it should not be understood that the scope of the above-mentioned subject matter of the present invention is limited to the following examples.

In the present invention, reflective powder was purchased from 3M Company, titanium dioxide was purchased from DuPont Company, electroplated aluminum glass microspheres were purchased from Autowin DY-3869, water-based acrylic resin was purchased from Foshan Nanhai Shuangwei Water-Based Materials Co., Ltd., other groups Fractions can be purchased from conventional manufacturers.

Embodiments 1-5, a kind of optical coating for laser TV projection screen

Include components in the following mass fractions:

Table 1

A preparation method of an optical coating for a projection screen for a laser TV, comprising the following steps:

S1) after mixing polymethyl methacrylate micropowder and spherical silicone powder, add it to the water-based acrylic resin, then add water, and ultrasonically disperse for 12 min to obtain a mixed solution;

S2) Mix and stir the reflective powder, barium sulfate, titanium dioxide, electroplated aluminum glass microspheres and sodium carboxymethyl cellulose, add it to the mixed solution in step S1, and mechanically stir for 6 minutes, to obtain the final product.

Comparative Example 1. Optical coating for projection screen for laser TV

Similar to Example 2, the difference is that no spherical silicone powder is added.

Comparative example 2, an optical coating for projection screen for laser TV

Similar to Example 2, the difference is that the spherical silicone powder is replaced with silica powder.

Comparative example 3, an optical coating for projection screen for laser TV

The components of this comparative example are the same as those of Example 2.

A preparation method of an optical coating for a projection screen for a laser TV, comprising the following steps:

S1) after mixing polymethyl methacrylate micropowder and spherical silicone powder, add it to the water-based acrylic resin, then add water, and mechanically stir for 12 min to obtain a mixed solution;

S2) Mix and stir the reflective powder, barium sulfate, titanium dioxide, electroplated aluminum glass microspheres and sodium carboxymethyl cellulose, add it to the mixed solution in step S1, and mechanically stir for 6 minutes, to obtain the final product.

Comparative example 4, an optical coating for projection screen for laser TV

The components of this comparative example are the same as those of Example 4.

A preparation method of an optical coating for a projection screen for a laser TV, comprising the following steps:

S1) after mixing polymethyl methacrylate micropowder and spherical silicone powder, add it to the water-based acrylic resin, then add water, and mechanically stir for 12 min to obtain a mixed solution;

S2 Mix and stir the reflective powder, barium sulfate, titanium dioxide, electroplated aluminum glass microspheres and sodium carboxymethyl cellulose, add it to the mixed solution in step S1, and mechanically stir for 6 minutes to obtain.

Comparative example 5, an optical coating for projection screen for laser TV

Similar to Example 2, except that no sodium carboxymethyl cellulose was added.

Experiment 1. Performance test

Experimental method: After the example/comparative example was painted on a white screen (soft cloth of Dongguan Chuangteng Textile Co., Ltd.), it was compared with the data of a special laser composite screen cloth (TD-102, Bantian Teli Screen Factory, Longgang District, Shenzhen) 5.0 is divided into reference basis.

Table 2

group brightness clarity gain Contrast Example 1 4.95 5.0 4.9 4.7 Example 2 5.0 4.9 4.95 4.95 Example 3 4.95 4.9 4.9 4.8 Example 4 4.9 4.95 4.85 4.8 Example 5 4.9 4.9 4.9 4.9 Comparative Example 1 3.5 3.7 3.45 3.3 Comparative Example 2 3.65 3.5 3.6 3.3 Comparative Example 3 4.1 4.05 4.1 4.1 Comparative Example 4 4.05 4.1 3.9 3.95 Comparative Example 5 4.9 4.85 4.9 4.95 Blank example 3.0 3.2 2.6 2.1

Note: The blank example is to spray the mixture of water-based acrylic resin and water only on the white screen.

As can be seen from Table 2, the optical coatings of Examples 1 to 5 are painted behind the white screen, so that the brightness, clarity, gain and contrast of the white screen are all close to the special laser composite screen cloth.

Experiment 2, horizontal viewing angle test

Experimental method: After the example/comparative example was painted on the white screen once, the screen was projected onto the white screen with a projector, the distance from the projector to the white screen was 2 meters, and the horizontal viewing angle was measured with a luminance meter.

table 3

Note: The blank example is to spray the mixture of water-based acrylic resin and water only on the white screen.

The brightness decreases with the deviation from the center of the screen. When the brightness decreases to 1/3, the angle between the position at this time and the center of the screen is the viewing angle, and the sum of the left and right viewing angles is the horizontal viewing angle. It can be seen from Table 3 that the horizontal viewing angles of Examples 1 to 5 are large, reaching more than 140°, and Example 2 is the best embodiment of the present invention.

Compared with Example 2, in Comparative Example 1, no spherical silicone powder was added, which greatly reduced the horizontal viewing angle. In Comparative Example 2, after the spherical silicone powder was replaced with silica powder, the optical coating was painted on a white screen. The viewing angle is also reduced.

Comparative Example 3, Comparative Example 4 After adjusting the preparation method of the optical coating, the horizontal viewing angle of the coating on the white screen is reduced. In Comparative Example 5, no sodium carboxymethyl cellulose is added, and the optical coating is painted on the white curtain. The horizontal viewing angle decreases, presumably due to the uneven particle size of the various raw materials added in the optical coating, resulting in the scattering of polymethyl methacrylate micropowder and spherical silicone powder not well distributed on the white screen caused by.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (9)

1. The optical coating for the projection screen of the laser television is characterized by comprising the following components in percentage by mass:

10-15% of reflective powder;

18-21% of barium sulfate;

15-20% of titanium dioxide;

1-5% of polymethyl methacrylate micro powder;

3-8% of spherical organic silicon powder;

3-8% of electroplated aluminum glass microspheres;

0.5-3% of sodium carboxymethylcellulose;

20-30% of water-based acrylic resin;

10-18% of water.

2. The optical coating for a projection screen of a laser television according to claim 1, comprising the following components in parts by mass:

12% of reflective powder;

20% of barium sulfate;

17% of titanium dioxide;

2% of polymethyl methacrylate micro powder;

5% of spherical organic silicon powder;

6% of electroplated aluminum glass microspheres;

sodium carboxymethylcellulose 1%;

25% of water-based acrylic resin;

12 percent of water.

3. The optical paint for a projection screen of a laser television as claimed in claim 1 or 2, wherein the particle size of the reflective powder is 5 to 15 μm.

4. The optical coating for a projection screen of a laser television set according to claim 1 or 2, wherein the particle size of the barium sulfate is 15 to 200 μm.

5. The optical paint for the projection screen of the laser television as claimed in claim 1 or 2, wherein the particle size of the titanium dioxide is 20 to 80 μm.

6. The optical coating for a projection screen of a laser television according to claim 1 or 2, wherein the polymethyl methacrylate fine powder has a particle size of 1.5 to 3 μm.

7. The optical coating for the projection screen of the laser television as claimed in claim 1 or 2, wherein the spherical organic silicon powder has a particle size of 1 to 3 μm.

8. The optical coating for the projection screen of the laser television as claimed in claim 1 or 2, wherein the particle size of the electroplated aluminum glass microsphere is 5-15 μm.

9. The method of claim 1, comprising the steps of:

s1) mixing the polymethyl methacrylate micro powder and the spherical organic silicon powder, adding the mixture into water-based acrylic resin, then adding water, and performing ultrasonic dispersion for 10-15 min to obtain a mixed solution;

s2) mixing and stirring the reflective powder, the barium sulfate, the titanium dioxide, the electroplated aluminum glass microspheres and the sodium carboxymethyl cellulose, adding the mixture into the mixed solution obtained in the step S1, and mechanically stirring for 5-10 min to obtain the light-emitting diode.