CN203365711U - Micro lens and micro lens array structure - Google Patents

Abstract

The utility model discloses a microlens and a microlens array structure, a sub-pixel microlens liquid lens array structure, which uses red, green and blue sub-pixels as viewpoints to rearrange the sub-pictures of the micro-lens, and performs lensing by rearranging the sub-pixels. Preparation: In the microlens array structure of the present utility model, a single lens is rectangular, and rows can be staggered. The physical structure of the lens includes a bottom substrate, a cavity structure is built on the substrate, and solidified liquid is in the cavity. The upper surface of the side wall of each cavity structure has a hydrophobic area; the hydrophobic area has the physical property of repelling each other with the liquid, so as to ensure that the liquid in the cavity will not slide down on the side wall. This structure is easy to realize, and the cost is low, and has strong practicability.

Description

A kind of microlens and microlens array structure

technical field

The utility model relates to a subpixel microlens liquid lens array structure, in particular to a subpixel microlens liquid lens array structure after rearranging microlens subimages with red, green and blue subpixels as viewpoints.

Background technique

Integrated imaging technology is becoming more and more mature, but there are still some key technical problems in the current integrated imaging display: in the acquisition process, the preparation of large size, uniform focal length, and large crosstalk is a key technology that restricts integrated imaging stereoscopic display. In the reconstruction process, the true 3D image reconstructed by the microlens array has problems such as small depth of field, narrow viewing angle, and low resolution.

Existing imaging technologies generally adopt the RGB color mode. RGB is the color representing the three channels of red, green, and blue (hereinafter referred to as RGB). This standard includes almost all colors that can be perceived by human eyesight. One of the color systems. Usually the RGB three colors constitute a complete pixel, a single R, G, and B are each a sub-pixel, and three different sub-pixels form a field of view. According to the principle of stereo vision, the left and right eyes of the observer see two parallax images of the same scene, and they can experience the stereo effect. As long as the observer sees two of the parallax images in different viewing positions, they can perceive the stereo effect. effect and see different sides of objects as you move horizontally. At present, three-dimensional imaging technology often adopts multi-viewpoint technology to obtain better stereoscopic effects, and uses traditional microlens arrays with pixels as viewpoints to form a field of view with three adjacent sub-pixels, but this array structure is prone to Incomplete image differentiation, resulting in crosstalk, and lower resolution.

Utility model content

In order to overcome the deficiencies in the prior art, the utility model provides a microlens, a microlens array structure and its manufacturing process, which rearranges the microlens sub-images with the red, green and blue sub-pixels as the viewpoint, reduces image crosstalk, and improves Resolution, so as to achieve excellent display effect.

In order to achieve the above object, the utility model takes the following technical solutions:

A subpixel microlens liquid lens array structure, each microlens is provided with at least one subpixel, and each field of view only takes one subpixel in a single microlens, and three adjacent microlenses form a field of view. Red, green and blue sub-pixels.

The utility model improves the traditional micro-lens array with pixels as viewpoints into a micro-lens array with sub-pixels as viewpoints. Combining the principle of sub-pixels, assuming that one viewpoint is lit, the improved synthetic pixels come from RGB three sub-pixels of different microlenses, and the pixel width is one-third of that of traditional microlens pixels. The distance between the improved viewpoints is also one-third of the traditional viewpoint distance. It can be seen that the new pixel pitch formed by the improved multi-view technology of the microlens array is smaller, so that the image is more delicate, the distinction is more obvious, the crosstalk is effectively reduced, and the resolution is improved.

The sub-pixels of each rearranged RGB combination in the utility model come from three different single microlenses, so each rearranged RGB combination can be arranged with any sub-pixel, such as RGB, GBR, etc. In addition, in the sub-pixel microlens liquid lens array structure, each rearranged RGB combined sub-pixel can form any shape, such as triangular, oblique triangular, or diagonal.

Furthermore, the RGB three-color sub-pixels in each microlens are aligned with the RGB three-color sub-pixels in the adjacent microlens in the vertical direction; the sub-pixels in each microlens in the horizontal direction are aligned with the adjacent microlens The sub-pixels are aligned, and the RGB three-color sub-pixels are arranged alternately in each row of sub-pixels.

Further, the RGB three-color sub-pixels are equally offset in the microlens, such as the fourth pixel in a single lens.

Furthermore, the RGB three-color sub-pixels are offset at equal angles in the microlens.

The utility model also proposes a microlens with a sub-pixel microlens liquid lens array structure. The microlens is rectangular and includes a bottom substrate. A cavity structure is built on the bottom substrate, and a solidified liquid is arranged in the cavity structure. ; The upper surface of the side wall of the cavity structure is provided with a hydrophobic area.

In the microlens liquid lens array structure, the rows of microlenses can be staggered or overlapped, and the rectangular aspect ratio of each microlens is arbitrary, such as the height and length of the microlens is half the width, the height and length of the microlens is approximately the The lens is taller than wider.

The utility model also proposes a process flow of a sub-pixel microlens liquid lens array structure, which is characterized in that:

(1) Lamination, using optical glass with a thickness of 1.5mm as the glass substrate, cleaning the glass substrate and cutting it into the required size specifications, and then pressing a 20 micron blue film on the glass substrate with a laminating machine;

(2) Mask etching, place a custom-shaped film on the laminated glass substrate, and expose the glass and film to ultraviolet light; then put the exposed glass substrate into a developing machine for development, and the developer will be cured Keep the good parts, wash off without light curing to form a cavity structure; finally dry;

(3) Apply a hydrophobic layer, and apply a layer of Teflon solution on the blue film that is still cured after mask etching as a hydrophobic layer;

(4) Coating, coating NOA73 solution in the uncured cavity structure formed after mask etching;

(5) UV curing, using UV curing to transform the liquid lens into a solid polymer lens.

Beneficial effects: (1) The sub-pixel microlens liquid lens array structure of the utility model rearranges the sub-images of the microlens with RGB sub-pixels as the viewpoint, and the RGB sub-pixels come from three different microlenses, which reduces crosstalk and enables The display resolution is greatly improved; (2) The utility model reduces the influence of gravity, air temperature and other elements on the quality of the lens through the method of solidifying the liquid; (3) The utility model has a simple overall structure, low cost and stable characteristics; (4 ) The hydrophobic region of the utility model has the physical property of mutual repulsion with the liquid, which ensures that the liquid in the cavity structure will not slide down to the side wall of the cavity structure, and improves the structural stability of the sub-pixel microlens liquid lens array; (5) The utility model paves the way for the study of the influence of the multi-viewpoint technology formed by sub-pixels on the crosstalk of integrated imaging, and by measuring the brightness spatial distribution of the traditional micro-lens array with pixels as the viewpoint, it further analyzes and evaluates the sub-pixel micro-lens array and the traditional micro-lens array. Lens array crosstalk situation.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a single microlens of the sub-pixel microlens liquid lens array structure of the present invention.

FIG. 2 is a schematic top view of the sub-pixel microlens liquid lens array structure of the present invention.

Fig. 3 is a schematic diagram of the microlens of the present invention, where the height and length are half the width.

Fig. 4 is a schematic diagram showing the approximate width and height of the microlens of the utility model.

Fig. 5 is a schematic diagram of the height-to-width ratio of the microlens of the present invention.

FIG. 6 is a schematic diagram of a triangular sub-pixel arrangement of the present invention.

FIG. 7 is a schematic diagram of an oblique triangle sub-pixel arrangement of the present invention.

Fig. 8 is a schematic diagram of a diagonal arrangement of the utility model.

Fig. 9 is a new pixel of the microlens provided by the present invention.

Figure 10 is a pixel of a conventional microlens.

FIG. 11 is a schematic cross-sectional view of the sub-pixel microlens liquid lens array structure of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1, the physical structure cross-sectional view of the microlens of the sub-pixel microlens liquid lens array structure proposed by the utility model includes the bottom substrate (1), and the cavity structure (2) is built on the bottom substrate (1). ), the cavity structure (2) is provided with a coagulation liquid (3); the upper surface of the side wall of the cavity structure (2) is provided with a hydrophobic region (4). As shown in FIG. 2 , the microlens is rectangular, and the rectangular aspect ratio of the microlens is arbitrary, such as the height and length of the microlens is half of the width, the height and length of the microlens are approximately the same as the width, and the height and length of the microlens are larger than the width.

The utility model provides a sub-pixel microlens liquid lens array structure, as shown in Figure 2, each field of view has only one sub-pixel in a single microlens, and three adjacent microlenses form a RGB triplet of a field of view. color subpixels. The sub-pixels of each rearranged RGB combination come from three different single microlenses, so each rearranged RGB combination can start with any pixel arrangement, such as RGB, GBR, etc. And the sub-pixels of each rearranged RGB combination in the sub-pixel microlens liquid lens array structure can form any shape, such as triangular (as shown in Figure 3), oblique triangular (as shown in Figure 4), diagonal (as shown in Figure 5 ). The black box in the figure represents a microlens. Due to the optical effect of lens imaging, it is assumed that 4 viewpoints of the 16-viewpoint lens are lit (color filled), that is, the corresponding 4th viewpoint of each microlens is lit. Moreover, the offset amount and offset angle of the RGB three-color sub-pixels in the microlens are equal, such as the fourth pixel in the single lens. In the sub-pixel microlens liquid lens array structure, the rows can be staggered, but the RGB sub-pixels inside each single lens are always aligned with the RGB sub-pixels between the single lenses in the vertical direction.

As shown in Figure 10, the traditional microlens pixels are arranged in a straight line, from 1 to 12, RGB sub-pixels are arranged alternately, as shown in Figure 9, the microlens provided by the utility model adopts different structures such as triangles to rearrange pixels.

Looking at Figure 9, assuming that 4 viewpoints are lit, the improved composite pixels come from the three sub-pixels of red, green and blue of different microlenses, and the pixel width is one-third of that of the traditional microlens pixels (Figure 10). The distance between the improved viewpoints is also one-third of the traditional viewpoint distance. It can be seen that the new pixel pitch formed by the improved multi-viewpoint technology of the microlens array is smaller, and the peak distance L between adjacent viewpoints is smaller.

By analyzing the brightness distribution of red, green, and blue light from different viewpoints, since the sub-pixels of the display screen are arranged in sequence according to the order of red, green, and blue sub-pixels, the distribution of the three light peaks is shifted, resulting in the comparison of single-pixel brightness D of white light. big. The improved red, green, and blue three-pixels are displayed in the same viewing space, and the peaks of red, green, and blue light are consistent through the lens effect. Considering the inconsistency of red, green, and blue light in the traditional microlens array and the larger point distance, the peak intensity of the white light synthesized after the improvement is increased, the single pixel brightness width D is reduced, and the peak distance L of adjacent curves is reduced to The original third is 1°. Since the interpupillary distance of the binoculars is about 7cm, when watching the improved microlens array, the left and right eyes are located far away in the viewing point area, and the brightness of the mutual interference between the left and right eyes is also reduced. Crosstalk is correspondingly reduced compared to conventional microlens arrays.

According to the design and theoretical analysis of the sub-pixel arrangement, different sub-pixel rearrangements will result in different moiré fringe effects. The moiré fringe is the smallest, the crosstalk is the smallest, and the higher the resolution, the better the display effect.

Microlens array is an optical device widely used in three-dimensional stereoscopic display. The microlens array is used in the acquisition stage and reproduction stage of integrated imaging, and its size, shape, focal length and other parameters have an important impact on the image display quality. Therefore, the preparation of a microlens array that meets the requirements is very critical for the research of integrated imaging. The manufacturing process of the utility model mainly has five steps. In the manufacturing process, each step requires high precision, so that the manufactured microlens array can have good uniformity and consistent optical characteristics. The method of implementation is as follows:

(1) Lamination

Microlens arrays are generally fabricated on glass substrates, first by cleaning the glass substrates and cutting them into required dimensions. Then, the photoresist is pressed on the glass substrate with a lamination machine.

The underlying substrate (1) is required to have certain hardness, heat resistance, corrosion resistance, and good transparency. In this example, optical glass with a thickness of 1.5 mm is used.

The cavity structure (2) requires good adhesion and uniformity, and can be formed into various structures at one time, with a thickness of micron level, and plays a role of supporting liquid. A 20 micron blue film was used in this example.

(2) Mask etching

A custom-shaped film is placed on a laminated glass substrate. The glass and film are exposed to UV light, and the areas where the UV light hits will be cured. Put the exposed glass into a developing machine for development, the developer will keep the cured part, and the uncured part will be washed away. What remains after drying is the desired shape.

A single lens in the mask pattern is rectangular, and each row of the array arrangement can be staggered, as shown in FIG. 2 as an example.

The aspect ratio of a single lens in the mask pattern is arbitrary, such as the height and length of the microlens is half the width (Figure 3), the height and length of the microlens is approximately the size of the width (Figure 4), and the height and length of the microlens is larger than the width (Figure 5).

The arrangement of sub-pixels in the mask pattern can be designed in any structure, such as triangular (Fig. 6), oblique triangular (Fig. 7), and diagonal (Fig. 8).

(3) Apply a hydrophobic layer

A layer of hydrophobic layer is coated on the blue film that is still cured after etching, and the hydrophobic layer can prevent the liquid from sticking to the blue film to separate adjacent liquid lenses.

The hydrophobic area (4) is made of transparent material. The hydrophobic area covers the upper surface of the cavity structure (2). The hydrophobic region has the physical property of mutual repulsion with the liquid, so as to ensure that the liquid in the cavity will not slide down to the side wall, as shown in FIG. 11 . In this example a Teflon solution was utilized.

(4) Glue

Gluing is the most important part of the whole preparation process. The relevant parameters of glue coating are related to the contact angle and shape of the liquid lens, thus affecting the focal length of the lens.

The coagulation liquid (3) is required to be a transparent solution, not volatile, non-toxic and easy to solidify. NOA73 solution was used in this example.

(5) UV curing

The glue-coated liquid lens is unstable and needs to be cured again by UV light to transform the liquid lens into a solid polymer lens.

Finally, combining the size of a single lens and the arrangement of sub-pixels, we can obtain sub-pixel microlens liquid lens arrays of various sizes and structures, such as triangular-microlens height and length are half the width (Figure 6), oblique triangle-microlens height The length is half of the width (Figure 7), Diagonal - the height and length of the microlens are half the width (Figure 8), Triangular - the height and length of the microlens is approximately the same as the width, Oblique triangle - the height and length of the microlens are larger than the width, diagonal Line - The microlens is as tall as it is wide.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (5)

1. a sub-pix lenticule liquid lens array structure, it is characterized in that: each lenticule at least is provided with a sub-pix, and three adjacent lenticules form a required redgreenblue sub-pix in visual field.

2. a kind of sub-pix lenticule liquid lens array structure according to claim 1, it is characterized in that: on longitudinal direction, the redgreenblue sub-pix of each lenticule inside aligns with the redgreenblue sub-pix of contiguous microlens inside respectively; The sub-pix of each lenticule inside aligns with the sub-pix of contiguous microlens inside in a lateral direction, and redgreenblue sub-pix alternative arrangement in every row sub-pix.

3. a kind of sub-pix lenticule liquid lens array structure according to claim 1 is characterized in that: described redgreenblue sub-pix side-play amount in lenticule equates.

4. a kind of sub-pix lenticule liquid lens array structure according to claim 1 is characterized in that: described redgreenblue sub-pix deviation angle in lenticule equates.

5. the lenticule in the described sub-pix lenticule of claim 1 a liquid lens array structure, it is characterized in that: this lenticule is rectangle, comprise bottom substrate (1), build a cavity body structure (2) on described bottom substrate (1), be provided with solidifying liq (3) in described cavity body structure (2); The upper surface of described cavity body structure (2) sidewall is provided with hydrophobic region (4).

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