CN104049371B - Disparity barrier module is used in a kind of 3D display - Google Patents

Abstract

A parallax barrier module for 3D display belongs to the technical field of image display. The present invention uses carbon black particles with negatively charged surface after surface modification treatment as the parallax barrier material, and the negatively charged carbon black particles on the surface undergo electrophoresis under the action of an electric field to gather on the surface of a high-potential transparent electrode to form a parallax barrier, which is suitable for 3D display ; After canceling the bias voltage, the negatively charged carbon black particles on the surface are evenly dispersed in the dispersion due to mutual repulsion, thus not affecting the display of 2D images. The invention has the characteristics of simple structure, low cost and convenient operation, and can adapt to the conversion between 3D images and 2D images.

Description

A parallax barrier module for 3D display

technical field

The invention belongs to the technical field of image display, and relates to naked-eye 3D display technology, in particular to a parallax barrier module in the naked-eye 3D display technology.

Background technique

Most of today's flat panel display devices are two-dimensional display devices that can only display flat images. The three-dimensional sense and layering of the scenes and objects displayed in two-dimensional display are not strong, and it is difficult for the audience to have an immersive feeling. With the progress of people's life, the demand for the look and feel of display technology has also increased, and the simple two-dimensional display can no longer meet people's requirements. The development of display technology is to bring people a more natural and realistic picture experience. The 3D display technology can make people feel as if they are in it and the three-dimensional look and feel that the two-dimensional display can't match. All aspects have broad application prospects.

The basic principle of 3D display technology is shown in Figure 1. It relies on the coordinated stereoscopic image recognition and analysis of the human eye and brain. It is mainly divided into vision-aided 3D technology and naked-eye 3D technology. Vision-aided 3D technology mainly uses external special equipment to send the stereoscopic image information of the left and right eyes to the left and right eyes of people respectively to achieve 3D effect; while the naked-eye 3D technology mainly uses the parallax barrier module on the screen. To adjust the angle of light so that the left and right eye images are sent to the left and right eyes of people respectively to achieve 3D display effect. Among them, 3D technology developed earlier, but 3D technology requires viewers to wear special glasses, which limits the field of view and viewing angle, and also reduces the brightness and resolution of the picture, and some users may even experience symptoms such as dizziness; The naked-eye 3D technology does not need to use other auxiliary equipment, but allows the light processed by the screen to enter the user's eyes to directly obtain 3D display images, which is very comfortable and convenient for viewing users, so it has become a research field for 3D display technology. main direction.

Although there are many ways to realize glasses-free 3D display, most of the devices currently on the market use parallax barrier modules. The parallax barrier module is a kind of structural material that is closely attached to the screen surface of the two-dimensional display device. Its working principle is shown in Figure 1. It forms a grating pattern in front of the flat panel display screen (between the human eye and the screen). Parallax barrier, the parallax barrier makes the left-eye image in the 3D display image can only enter the left eye of the audience, and the right-eye image in the 3D display image can only enter the right eye of the audience, thereby producing a stereoscopic effect in the audience's brain.

The most original 3D parallax barrier module is a fixed parallax barrier module. The parallax barrier formed by this fixed parallax barrier module is fixed and can only be used to display 3D images, not in Convert between 3D images and 2D images. Generally, it is hoped that the use of the parallax barrier module will not affect the display of 2D images, so the parallax barrier module should be able to adapt to the conversion between 3D images and 2D images. Existing parallax barrier modules that can adapt to the conversion between 3D images and 2D images mostly use polymer liquid crystal layers to form parallax barriers, but such parallax barrier modules have the disadvantages of complex electrode structures and high cost of liquid crystal materials. place.

The surface of carbon black particles is almost pure black, has strong light-shielding properties, meets the basic requirements of parallax barrier materials, and the cost of carbon black is low, but the cohesion between carbon black particles is strong, and the surface free energy is high. It is easy to form larger aggregates and should not be dispersed. The use of carbon black as a parallax barrier material faces the problem of how to adapt to the conversion between 3D images and 2D images.

Contents of the invention

The invention provides a parallax barrier module for 3D display. The parallax barrier module can adapt to the conversion between 3D images and 2D images, and has the characteristics of simple structure, low cost and convenient operation.

Technical scheme of the present invention is as follows:

A parallax barrier module for 3D display, comprising a first transparent substrate 10, a second transparent substrate 11, a first transparent electrode 20, and a second transparent electrode 21, wherein the first transparent electrode 20 is attached to the surface of the first transparent substrate 10, The second transparent electrode 21 is attached to the surface of the second transparent substrate 11; there are several transparent dielectric materials 30 parallel to each other between the first transparent electrode 20 and the second transparent electrode 21, and all the transparent dielectric materials 30 are fixedly bonded to the first transparent electrode 20 and the second transparent electrode 21, and divide the space between the first transparent electrode 20 and the second transparent electrode 21 into several subspaces 31 distributed in parallel and equally spaced; A dispersion of carbon black particles is then encapsulated as a whole.

The parallax barrier module for 3D display is mounted on the surface of the flat panel display screen, and when used for 3D display, a bias voltage is applied between the first transparent electrode 20 and the second transparent electrode, and the negatively charged carbon black particles on the surface Electrophoretic phenomenon occurs under the action, so as to gather on the surface of the high-potential transparent electrode to form a parallax barrier. The formed parallax barrier can make the left eye image only enter the observer's left eye and the right eye image only enter the observer's right eye; when the first transparent electrode 20 When there is no bias voltage applied between the second transparent electrode and the negatively charged carbon black particles on the surface, they are uniformly dispersed in the dispersion liquid due to mutual repulsion, thus not affecting the display of 2D images.

In the above-mentioned parallax barrier module for 3D display, the dispersion system of the negatively charged carbon black particles on the surface is obtained by dispersing the negatively charged carbon black particles in the dispersion liquid, and the dispersion liquid is tetrachlorethylene or tetrachlorethylene organic solution. In order to improve the dispersion effect of negatively charged carbon black particles in the dispersion liquid, a surfactant can be properly added to the dispersion system, such as: sorbitan monooleate (Span-80) or sodium dodecylsulfonate (SDS). The negatively charged carbon black particles on the surface are obtained by oxidation and modification of carbon black particles with concentrated nitric acid. The specific process is as follows: first, bake the commercially available carbon black particles at 200°C to remove the moisture adsorbed in the carbon black and some grease impurities; then disperse the baked carbon black particles in a concentrated nitric acid solution with a concentration of 67% by mass, and stir magnetically at a constant temperature at 120°C for 8 hours. A condensing reflux device is used throughout the process to ensure the concentration of nitric acid ; Finally, the carbon black particles treated with concentrated nitric acid are filtered and cleaned, and ball milled, and the ball mill material is dried to obtain negatively charged carbon black particles on the surface.

In addition, without special explanation, those skilled in the art should know that in the above technical solution, the transparent substrate material should be glass, the transparent electrode should be ITO electrode, and the transparent dielectric material 30 should be glass.

The essence of the present invention is to use the carbon black particles whose surface is negatively charged after the surface modification treatment as the parallax barrier material. Usually, in the process of carbon black generation, carbon black particles are aggregated and connected together, the cohesion between particles is strong, the surface free energy is high, and it is easy to form larger aggregates, which are not suitable for dispersion. However, in industrial production and research applications, in order to ensure the excellent performance of carbon black materials, it is generally required that carbon black particles can form a uniform and stable dispersion system in a solvent. Therefore, surface modification of carbon black is required. Nitric acid is a strong oxidizing solution, which can introduce a variety of oxygen-containing functional groups mainly carboxyl and phenolic hydroxyl groups on the surface of carbon black, and with the increase of reaction temperature, the oxidation degree of carbon black surface is deepened. The invention uses concentrated nitric acid as an oxidizing agent in the liquid phase method to carry out deep oxidation modification on the surface of carbon black. At the beginning of the oxidation modification, weakly acidic phenolic hydroxyl groups are first produced on the surface of carbon black. As the oxidation modification progresses, the degree of oxidation gradually deepens, and the weakly acidic hydroxyl groups are gradually further oxidized into strongly acidic carboxyl groups. Concentrated nitric acid is volatile, and it is easier to remove after oxidation modification, and will not leave impurities in carbon black. In the process of oxidative modification, the number of oxygen-containing functional groups on the surface of carbon black will gradually increase, and the oxygen content in carbon black will gradually increase. These acidic oxygen-containing functional groups increase the negative charge on the surface of carbon black and become local polarity. The electrostatic repulsion between carbon black particles can well hinder the aggregation and bonding of carbon black particles so as to enhance the dispersion stability of carbon black particles.

The present invention uses the carbon black particles whose surface is negatively charged after surface modification treatment as the parallax barrier material, and at the same time improves the structure of the parallax barrier module for 3D display, making the structure simpler and more convenient to operate. ,

In a word, the parallax barrier module for 3D display provided by the present invention has the characteristics of simple structure, low cost and convenient operation, and can adapt to mutual conversion between 3D images and 2D images.

Description of drawings

FIG. 1 is a schematic diagram of the basic principle of naked-eye 3D display.

FIG. 2 is a schematic cross-sectional structure diagram of the parallax barrier module for 3D display provided by the present invention (without power supply).

FIG. 3 is a schematic cross-sectional structure diagram (power-on) of the parallax barrier module for 3D display provided by the present invention.

Fig. 4 is a schematic diagram of the process of obtaining carbon black particles with negatively charged surfaces through oxidation modification of carbon black particles in concentrated nitric acid in the present invention.

detailed description

The patent of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

A parallax barrier module for 3D display, as shown in Figure 2, includes a first transparent substrate 10, a second transparent substrate 11, a first transparent electrode 20, and a second transparent electrode 21, wherein the first transparent electrode 20 is attached to On the surface of a transparent substrate 10, the second transparent electrode 21 is attached to the surface of the second transparent substrate 11; between the first transparent electrode 20 and the second transparent electrode 21, there are several transparent dielectric materials 30 parallel to each other, and all the transparent dielectric materials 30 are fixed and adhered to each other. Connected between the first transparent electrode 20 and the second transparent electrode 21, and the space between the first transparent electrode 20 and the second transparent electrode 21 is divided into several subspaces 31 distributed in parallel and equally spaced; in all subspaces 31 A dispersion system of negatively charged carbon black particles is poured into the medium, and then encapsulated as a whole.

The parallax barrier module for 3D display is mounted on the surface of the flat panel display screen. When used for 3D display, a bias voltage is applied between the first transparent electrode 20 and the second transparent electrode. As shown in FIG. 3, the surface is negatively charged The carbon black particles undergo electrophoresis under the action of an electric field and gather on the surface of the high-potential transparent electrode to form a parallax barrier. The formed parallax barrier can make the left-eye image only enter the observer's left eye and the right-eye image only enter the observer's right eye; When no bias voltage is applied between the first transparent electrode 20 and the second transparent electrode, the negatively charged carbon black particles on the surface are uniformly dispersed in the dispersion due to mutual repulsion, thus not affecting the display of 2D images.

In the above-mentioned parallax barrier module for 3D display, the dispersion system of the negatively charged carbon black particles on the surface is obtained by dispersing the negatively charged carbon black particles in the dispersion liquid, and the dispersion liquid is tetrachlorethylene or tetrachlorethylene organic solution. In order to improve the dispersion effect of negatively charged carbon black particles in the dispersion liquid, a surfactant can be properly added to the dispersion system, such as: sorbitan monooleate (Span-80) or sodium dodecylsulfonate (SDS). The negatively charged carbon black particles on the surface are obtained by oxidation and modification of carbon black particles with concentrated nitric acid. The specific process is as follows: first, bake the commercially available carbon black particles at 200°C to remove the moisture adsorbed in the carbon black and some grease impurities; then disperse the baked carbon black particles in a concentrated nitric acid solution with a concentration of 67% by mass, and stir magnetically at a constant temperature at 120°C for 8 hours. A condensing reflux device is used throughout the process to ensure the concentration of nitric acid ; Finally, the carbon black particles treated with concentrated nitric acid are filtered, cleaned, and ball milled, and the ball mill material is dried to obtain carbon black particles with negative charges on the surface.

In addition, without special explanation, those skilled in the art should know that in the above technical solution, the transparent substrate material should be glass, the transparent electrode should be ITO electrode, and the transparent dielectric material 30 should be glass.

Claims (6)

1. A parallax barrier module for 3D display, comprising a first transparent substrate (10), a second transparent substrate (11), a first transparent electrode (20), and a second transparent electrode (21), wherein the first transparent electrode (20) is attached to the surface of the first transparent substrate (10), and the second transparent electrode (21) is attached to the surface of the second transparent substrate (11); between the first transparent electrode (20) and the second transparent electrode (21) there is Some transparent dielectric materials (30) parallel to each other, all the transparent dielectric materials (30) are fixedly bonded between the first transparent electrode (20) and the second transparent electrode (21), and the first transparent electrode (20) and the second transparent electrode (21) are fixedly bonded. The space between the second transparent electrodes (21) is divided into several subspaces (31) distributed in parallel and equally spaced; It is characterized in that all the subspaces (31) are filled with a dispersion system of negatively charged carbon black particles on the surface, and then packaged as a whole; the parallax barrier module for 3D display is pasted on the surface of the flat panel display screen for 3D display , a bias voltage is applied between the first transparent electrode (20) and the second transparent electrode, and the negatively charged carbon black particles on the surface undergo electrophoresis under the action of an electric field to gather on the surface of the high-potential transparent electrode to form a parallax barrier, the formed The parallax barrier can make the left-eye image only enter the observer's left eye and the right-eye image only enter the observer's right eye; when no bias voltage is applied between the first transparent electrode (20) and the second transparent electrode, the negatively charged surface The carbon black particles are uniformly dispersed in the dispersion liquid due to mutual repulsion, thus not affecting the display of 2D images. 2. The parallax barrier module for 3D display according to claim 1, wherein the dispersion system of the negatively charged carbon black particles is obtained by dispersing the negatively charged carbon black particles in the dispersion liquid, and the The dispersion liquid is tetrachlorethylene or an organic solution of tetrachlorethylene. 3. The parallax barrier module for 3D display according to claim 2, characterized in that, in order to improve the dispersion effect of the negatively charged carbon black particles on the surface in the dispersion liquid, a surfactant is properly added to the dispersion system. 4 . The parallax barrier module for 3D display according to claim 3 , wherein the surfactant is sorbitan monooleate or sodium dodecylsulfonate. 5. The parallax barrier module for 3D display according to claim 1, wherein the negatively charged carbon black particles on the surface are obtained by oxidation and modification of carbon black particles with concentrated nitric acid. The carbon black particles are baked at 200°C to remove the moisture and some grease impurities adsorbed in the carbon black; then the carbon black particles after the baking treatment are dispersed in a concentrated nitric acid solution with a mass percentage concentration of 67%. Constant temperature magnetic stirring at 120°C for 8 hours. A condensing reflux device is used throughout the process to ensure the concentration of nitric acid. Finally, the carbon black particles treated with concentrated nitric acid are filtered, cleaned, and ball milled. After the ball mill is dried, the surface negatively charged carbon black particles. 6. The parallax barrier module for 3D display according to claim 1, wherein the transparent substrate material is glass, the transparent electrode is preferably an ITO electrode, and the transparent dielectric material (30) is glass.