CN1146749C - Optical film overlapping element - Google Patents

Abstract

Provide a kind of optical film stacking body, it is characterized in that: the first optical film and the second optical film are overlapped, have: with the optical axis of the second optical film parallel or vertical two parallel sides; Relative to the two sides inclined, One side parallel to the optical axis of the first optical film; and the other side not parallel to the optical axis of the first optical film. The first optical film is a polarizing film, and the second optical film is a retardation film. This optical film stack can easily distinguish the direction of the optical axis of the first optical film from the direction of the optical axis of the second optical film.

Description

Optical film laminate and manufacturing method thereof

technical field

The present invention relates to an optical film laminate.

Background technique

Optical films represented by polarizing films, retardation films, and the like are important as optical components constituting liquid crystal display devices.

In most cases, two or more such optical films are stacked and installed in liquid crystal display devices. For example, in STN (Super Twisted Nenatie) type liquid crystal display devices, etc., the first optical film (such as Polarizing film) and a second optical film (such as retardation film) stacked square optical film stack chip.

In such a square optical film stacked chip (10), the optical axis of the polarizing film is the absorption axis (1) or the optical axis of the retardation film is the slow axis (2) in the direction of the liquid crystal display device. The display performance of the display device is important, and if these directions are even slightly deviated from predetermined design values, the liquid crystal display device cannot exhibit the intended performance. Therefore, it is necessary to strictly manage the angle (θ1) of the absorption axis (1) of these polarizing films relative to the reference line (9) of the optical film stack chip (10) and the slow axis (2) of the retardation film in the optical film stack chip. ) with respect to the angle (θ2) of the reference line (9) of the optical film overlapping chip (10) (Fig. 11).

As shown in Figure 11, here, the angle (θ1) of the so-called absorption axis (1) refers to the angle of the reference line (9) of the absorption axis (1) relative to the optical film stack chip (10) viewed from the polarizing film side The angle (θ2) of the so-called slow axis (2) refers to the reference line (9) of the slow axis (2) relative to the stacked chip of the optical film viewed from the polarizing film side. When the angle is positively expressed by counterclockwise rotation, it is expressed as above 0° and below 180°. The reference line (9) is usually selected to overlap the reference side (90) of the chip with the square optical film, that is, parallel to the direction of the long side (Fig. 11) or parallel to the direction of the short side.

In addition, although the size of the square optical film stacked chip (10) can be appropriately selected according to the size of the target liquid crystal display device, its size is, for example, 30 mm long side x 20 mm short side ~ 300 mm long side x 200 mm short side.

Such a square optical film stacked chip can be manufactured by such a method: for example, a strip-shaped polarizing film and a strip-shaped retardation film are used as raw materials, and a square polarizing film chip and a square retardation film are independently cut out from these raw materials. For the film chips, these square polarizing film chips and square retardation film chips are bonded together with an adhesive or the like. The strip-shaped polarizing film and the strip-shaped retardation film used as a raw material can generally use arbitrary polarizing films and retardation films as a raw material, for example, can be supplied in the state wound up on the roll.

In such an optical film laminated chip, even if it is an optical film laminated chip mounted in a different type of liquid crystal display device, the slow axis (2) of the retardation film relative to the absorption axis (1) of the polarizing film is often The relative angles (θ) are the same. The so-called relative angle (θ) here is based on the angle (θ1) of the absorption axis of the polarizing film relative to the reference line (9) of the optical film overlapping chip and the slow axis of the retardation film relative to the reference line (9) of the optical film overlapping chip 9) The angle (θ2) is an angle calculated by the following formula (I).

θ＝θ2-θ1 (I)

However, in the above-mentioned manufacturing method of the polarizing film chip and the retardation film chip, even if the relative angle (θ) of the obtained optical film stack chip is the same, for example, if the size of the optical film stack chip or The angle (θ1) of the absorption axis relative to the reference line (9) and the angle (θ2) of the slow axis of the retardation film relative to the reference line (9) are different, then there is this method that cannot be transferred to other liquid crystal display devices. Issues in the Fabrication of Membrane Overlay Chips.

As a method for solving such a problem, for example, as shown in Fig. 12(a) and Fig. 12(b), the following method can be considered: manufacture a kind of parallelogram-shaped optical film overlapping body, which has The two sides (FG, EH) of the absorption axis (1), and the two sides (EF , HG) optical film laminate (8), using it as an intermediate, according to its vertical and horizontal dimensions, the angle of the absorption axis (θ1), and the angle of the slow axis (θ2), cut out the optical film as the target from the above intermediate. The membrane overlaps the chip.

If this manufacturing method is adopted, in the parallelogram-shaped optical film stack (8), one group of opposite sides (FG, EH) of the two groups of opposite sides constituting the parallelogram is parallel to the absorption axis (1) of the polarizing film, Another group of opposite sides (EF, HG) is parallel to the direction of the slow axis (2) of the retardation film (Figure 12 (a)) or perpendicular (Figure 12 (b)), so the optical film stack (8) have two sides (FG, HG) intersecting the same angle as the relative angle (θ) of the slow axis (2) of the retardation film with respect to the absorption axis (1) of the polarizing film ( θ) (Fig. 12(a)) or angle (θ−90°) (Fig. 12(b)). Therefore, the magnitude of ∠HGF (angle φ) is angle θ or angle (θ-90°), and the angle θ or (θ-90°) can also be judged from the shape of the parallelogram.

Therefore, if the manufacturing method via the parallelogram-shaped optical film stack (8) is adopted, the parallelogram-shaped optical film stack (8) stacked from the polarizing film and the retardation film at a prescribed relative angle (θ) in advance Cut out the optical film stacked chip as the target, so can manufacture multiple kinds of optical film stacked chips from a kind of optical film stacked body (8), such as above-mentioned multiple optical film stacked chips with the same relative angle (θ) and different vertical and horizontal dimensions, Or the above-mentioned relative angle (θ) and vertical and horizontal dimensions are the same, only the angle (θ1) of the absorption axis (1) of the polarizing film relative to the reference line (9) and the slow axis (2) of the retardation film relative to the reference line (9 ) with different angles (θ2) to overlap the chip with various optical films. As a result, the parallelogram-shaped optical film laminate can be stored and managed as a common intermediate for multiple types of optical film laminate chips, so labor is saved in inventory control and further improvement in productivity can be achieved.

However, in the case of such a parallelogram-shaped optical film laminate, in actual operation, it is not easy to judge with the naked eye which of the two groups of parallel opposite sides constituting the parallelogram is aligned with the absorption axis (1) of the polarizing film. Parallel, which group is parallel or perpendicular to the slow axis (2) of the retardation film, it is possible to confuse the direction of the absorption axis (1) with the direction of the slow axis (2).

Contents of the invention

Therefore, the inventors of the present invention have earnestly studied to develop an optical film laminate that can be easily judged without confusing the direction of the absorption axis (1) of the polarizing film and the direction of the slow axis (2) of the retardation film. As a result, an optical film in which two parallel sides of the optical film laminate are parallel or perpendicular to the slow axis of the retardation film, one side is parallel to the absorption axis of the polarizing film, and the other side is not parallel to the absorption axis of the polarizing film The overlapping body can easily determine the absorption axis of the polarizing film and the slow axis of the retardation film, thus achieving the purpose of the present invention.

That is, the present invention provides an optical film laminate, characterized in that: the first optical film and the second optical film are overlapped, and there are two sides parallel to or perpendicular to the optical axis of the second optical film, opposite to the optical axis of the second optical film. The two sides are inclined, one side parallel to the optical axis of the first optical film, and the other side non-parallel to the optical axis of the first optical film; the first optical film is a polarizing film, and the second optical film is a retardation film .

Description of drawings

Fig. 1, Fig. 2, Fig. 9 and Fig. 10 are schematic diagrams showing examples of the optical film laminate of the present invention.

3 and 6 are schematic diagrams showing an example of the manufacturing process of the optical film laminate of the present invention.

4 , FIG. 5 , FIG. 7 , and FIG. 8 are schematic diagrams showing an example of a manufacturing process for manufacturing the optical film laminate of the present invention from a parallelogram-shaped optical film laminate.

11 is a schematic diagram showing the relationship between the reference line of the square optical film stacked chip, the optical axis of the first optical film, and the optical axis of the second optical film.

12 is a schematic view showing the relationship between the optical axis of the first optical film and the optical axis of the second optical film in a parallelogram optical film stack.

13 and 14 are schematic diagrams showing an example of a method of cutting out a square optical film laminate chip along one side (AD) from the optical film laminate of the present invention.

Explanation of symbols

1: Absorption axis of the polarizing film (optical axis of the first optical film)

2: Slow axis of the retardation film (optical axis of the second optical film)

3: Optical film overlay

4: Strip-shaped polarizing film (strip-shaped first optical film)

5: Sliced polarizing film (inserted first optical film)

6: Ribbon-shaped retardation film (ribbon-shaped second optical film)

7: Strip-shaped optical film laminate in which a slice-shaped polarizing film (insert-shaped first optical film) and a strip-shaped retardation film (strip-shaped second optical film) are stacked

8: Parallelogram optical film overlay

9: Baseline of optical film overlapping chips

90: The reference edge of the optical film overlay chip

10: Optical film overlapping chip

C1: cutting line

C2: cutting line

C3: cutting line

θ1: The angle of the absorption axis of the polarizing film (optical axis of the first optical film) relative to the reference line of the optical film stack chip

θ2: Angle of the slow axis of the retardation film (optical axis of the second optical film) relative to the reference line of the optical film stack chip

θ: The relative angle of the slow axis of the retardation film (optical axis of the second optical film) to the absorption axis of the polarizing film (optical axis of the first optical film) (θ2-θ1)

φ: Angle of the cutting line (C1) relative to the longitudinal direction of the strip-shaped polarizing film (strip-shaped first optical film)

φ2: Angle of the cutting line (C3) relative to both edges of the strip-shaped retardation film (strip-shaped second optical film)

Detailed ways

One example of the optical film laminated body of this invention is shown in FIG.1(a), (b), and (c), and FIG.2(a), (b), and (c).

In Fig. 1 (a), (b) and (c) the example of the optical film overlapping body (3) shown respectively is that the two sides (AB, DC) parallel to each other are parallel to the optical axis (2) of the second optical film As an example, a trapezoidal optical film stack ( 3 ) is shown in which the upper base (AB) and the lower base (DC) are parallel to the optical axis ( 2 ) of the second optical film.

Such an optical film stack (3) has a structure in which a polarizing film and a retardation film are stacked. Here, the polarizing film corresponds to the first optical film, and the retardation film corresponds to the second optical film. The polarizing film and retardation film are laminated with a normal adhesive layer. As the adhesive layer, for example, a transparent optically isotropic adhesive layer made of an adhesive such as an acrylic pressure-sensitive adhesive (adhesive) is used.

In such an optical film laminate (3), the upper base (AB) and the lower base (DC) correspond to two sides parallel to each other. The length of the upper base (AB) is, for example, about 50 mm to 1000 mm, and the length of the lower base (DC) is, for example, about 500 mm to 1500 mm.

In addition, such an optical film stack (3) has a hypotenuse (BC), and the hypotenuse (BC) is an inclined side with respect to the above-mentioned mutually parallel sides (AB, DC), which is equivalent to being neither parallel nor perpendicular to One side of the two sides. The length of the hypotenuse (BC) is, for example, about 500 mm to 2000 mm.

The oblique side (BC) is parallel to the optical axis (1) of the first optical film, that is, to the absorption axis of the polarizing film. The upper base (AB) and the lower base (DC) are parallel to the optical axis (2) of the second optical film, that is, to the slow axis of the retardation film. Therefore, the angle (φ) formed by the hypotenuse (BC) and the bottom (DC) of the optical film laminate, that is, ∠DCB, becomes the slow axis (2) of the retardation film and the absorption axis (1) of the polarizing film. The relative angle (θ) of the same angle.

Therefore, in this example, the absorption axis (1) of the polarizing film represents the hypotenuse, and the slow axis (2) of the retardation film represents two sides parallel to each other, that is, the upper bottom (AB) and the lower bottom (DC), so The direction of the absorption axis (1) of the polarizing film and the direction of the slow axis (2) of the retardation film can be easily distinguished, and there is little possibility of mistaking these directions. In addition, the relative angle (θ) represents the angle (φ) formed by the hypotenuse (BC) and the bottom (DC), that is, represents ∠DCB.

1 (a), (b) and (c) in the optical film laminates shown respectively have the other side (AD) not parallel to the optical axis (1) of the first optical film, the other side (AD) The direction of extension of the first optical film forms an angle in the range of, for example, 1° to 179° with respect to the direction of the optical axis of the first optical film. The length of the other side (AD) is, for example, about 500 mm to 2000 mm.

In the optical film laminate shown in FIG. 1( a ), the other side (AD) is perpendicular to the upper base (AB) and the lower base (DC), that is, perpendicular to the two parallel sides. Therefore, the hypotenuse (BC) can be easily known, and the optical axis of the first optical film can be more conveniently determined.

In addition, in the examples shown in Fig. 1(a), (b) and (c), respectively, when the relative angle (θ) is less than 40° or greater than 140°, the trapezoid is elongated, and the optical film stack Handling is difficult, so θ is preferably between 40° and 140°, more preferably between 45° and 135°. In addition, the angle (φ) is 90°. In general, except that the side (BC) cannot be distinguished from the hypotenuse, especially when the side (AD) is perpendicular to the upper bottom (AB) and the lower bottom (DC), the side (AD) ) and the upper bottom (AB) have the same length, the upper bottom (AB) and the side (AD) cannot be distinguished, so the angle (φ), that is, ∠DCB is preferably less than 90° or greater than 90°, so the relative angle (θ ) less than 90° or greater than 90°. In addition, in fact, if the angle (φ), that is, the relative angle (θ) is 89° or less or 91° or more, the side (BC) can be recognized as the hypotenuse.

In Fig. 2 (a), (b) and (c) the example of the optical film laminated body (3) shown respectively is when the two sides (AB, DC) parallel to each other are perpendicular to the optical axis (2) of the second optical film For example, a trapezoidal optical film stack ( 3 ) is shown in which the upper base (AB) and the lower base (DC) are perpendicular to the optical axis ( 2 ) of the second optical film.

Such an optical film stack (3) has a structure in which a polarizing film and a retardation film are stacked. Here, the polarizing film corresponds to the first optical film, and the retardation film corresponds to the second optical film. The polarizing film and retardation film are laminated with a normal adhesive layer. As the adhesive layer, for example, a transparent optically isotropic adhesive layer made of an adhesive such as an acrylic pressure-sensitive adhesive (adhesive) is used.

In such an optical film laminate (3), the upper base (AB) and the lower base (DC) correspond to two sides parallel to each other. The length of the upper base (AB) is, for example, about 50 mm to 1000 mm, and the length of the lower base (DC) is, for example, about 500 mm to 1500 mm.

In addition, there is a hypotenuse (BC), which is a side inclined with respect to the above-mentioned mutually parallel sides (AB, DC), and corresponds to a side that is neither parallel nor perpendicular to the two sides. The length of the hypotenuse (BC) is, for example, about 500 mm to 2000 mm.

The hypotenuse (BC) is parallel to the optical axis (1) of the first optical film, ie to the absorption axis of the polarizing film. The upper base (AB) and the lower base (DC) are perpendicular to the optical axis of the second optical film, that is, to the slow axis (2) of the retardation film. Therefore, the line (not shown) passing the vertex C parallel to the slow axis (2) is perpendicular to the lower base (DC), and the line (not shown) constituted by the hypotenuse (BC) An obtuse angle coincides with angle (θ). Therefore, the angle (φ) formed by the hypotenuse (BC) and the bottom (DC) of the optical film stack, that is, ∠DCB becomes the same angle as (θ-90°).

Therefore, in this example, the absorption axis (1) of the polarizing film represents the hypotenuse (BC), and the direction of the slow axis (2) of the retardation film represents the direction perpendicular to the line of the upper bottom and the lower bottom, so it can be easily The direction of the absorption axis (1) of the polarizing film and the direction of the slow axis (2) of the retardation film can be accurately discriminated, and the possibility of mistaking these directions is also small. In addition, the relative angle (θ) can be calculated from the formula (II) from the angle (φ) formed by the hypotenuse (BC) and the lower base (DC).

θ＝φ+90° (II)

2 (a), (b) and (c) in the optical film laminated body shown respectively has another side (AD) that is not parallel to the optical axis (1) of the first optical film, the other side (AD) The direction of extension of the first optical film forms an angle in the range of, for example, 1° to 179° with respect to the direction of the optical axis of the first optical film. The length of the other side (AD) is, for example, about 500 mm to 2000 mm.

In the optical film laminate shown in FIG. 2( a ), the other side (AD) is perpendicular to the upper base (AB) and the lower base (DC), that is, perpendicular to the two parallel sides. Therefore, the hypotenuse (BC) can be easily known, and the optical axis of the first optical film can be more conveniently determined.

In addition, in the examples shown in Figure 2(a), (b) and (c), if the relative angle (θ) is greater than 50° and less than 130°, the angle (φ) is less than 40° or greater than 140°, The trapezoid is long and thin, and it is difficult to handle the optical film stack, so θ is preferably less than 50° or more than 130°, and more preferably less than 45° or more than 135°. In addition, the angle (φ) is 90°. In general, except that the side (BC) cannot be distinguished from the hypotenuse, especially when the side (AD) is perpendicular to the upper bottom (AB) and the lower bottom (DC), the upper bottom ( When the lengths of AB) and side (AD) are the same, the upper bottom (AB) and the side (AD) cannot be distinguished, so the angle (φ) is preferably less than 90° or greater than 90°, so the relative angle (θ) is less than 180° Or greater than 0°. In fact, if the angle (φ) is 89° or less or 91° or more, the side (BC) can be recognized as a hypotenuse, so the relative angle (θ) may be 179° or less or 1° or more.

Although the optical film superimposed body of the present invention shown in Fig. 1 and Fig. 2 is a quadrilateral (trapezoidal) shape, the optical film superimposed body of the present invention is not limited to a quadrilateral, for example, at its four vertices (A, B, C, D ), at least one vertex can also be missing.

For example, as shown in Figure 9 and Figure 10 of the optical film overlapping body of the present invention, a vertex (C) of the quadrangular optical film overlapping body shown in Figure 1 and Figure 2 is defective, and there may be another one parallel to the other side. One side (C'C'') of (AD). One vertex (C) of the quadrangular optical film laminate can be cut off to easily manufacture such an optical film laminate.

In order to obtain a square optical film stacked chip (10) from such an optical film stacked body (3) of the present invention, the vertical and horizontal dimensions of the target optical film stacked chip and the angle of the absorption axis of the polarizing film relative to the reference line can be (θ1) or the angle (θ2) of the slow axis of the retardation film relative to the reference line, cut the optical film laminate (3), and cut out a square optical film laminate chip. The method of cutting out is not particularly limited, for example, it can be cut out by cutting with a punch or the like.

Here, the angle (θ1) of the absorption axis (1) relative to the reference side (90) or the angle (θ2) of the slow axis (2) relative to the reference side (90) and When the angle of the absorption axis (1) of the optical film laminate (8) with respect to the other side (AD) or the angle of the slow axis (2) with respect to the other side (AD) is equal, that is, in the case of a square optical film When the direction of the reference side (90) of the stacked chip is parallel to the direction of the other side (AD), as shown in FIGS. ), cut out a square optical film stack chip (10).

In order to manufacture such an optical film laminate (3) of the present invention from a strip-shaped polarizing film (strip-shaped first optical film) (4) and a strip-shaped retardation film (strip-shaped second optical film) (6) ), the strip-shaped polarizing film and the strip-shaped retardation film are respectively cut into a trapezoidal shape and pasted together, but as shown in Figure 3 or Figure 6, it is best to use the following method to manufacture:

(i) set the cutting line (C1) in such a way that the angle (φ) formed by the cutting line (C1) with respect to the longitudinal direction of the strip-shaped polarizing film (strip-shaped first optical film) (4) and the optical film The relative angle (θ) of the slow axis (optical axis of the second optical film) (2) of the retardation film of the stack (3) to the absorption axis (optical axis of the first optical film) (1) of the polarizing film (Fig. 3) or (θ-90°) (Fig. 6) are equal, cut off the strip-shaped polarizing film (4) along the cutting line (C1), and cut out the sliced polarizing film (5), which has a relative polarization The absorption axis of the film (the optical axis of the first optical film) (1) constitutes the parallel two sides (FE, GH) of the above-mentioned angle (φ), and the distance between the two sides is the same as that of the strip-shaped retardation film (6). a parallelogram of approximately equal width,

(ii) Make the above-mentioned two sides (FE, GH) of the slice-shaped polarizing film (5) along the both edges (IJ, KL) of the strip-shaped retardation film, and the obtained slice-shaped polarizing film (5) Overlap on the strip-shaped retardation film (6), obtain the strip-shaped optical film laminate (7) in which the slice-shaped polarizing film (5) is overlapped on the strip-shaped retardation film (6),

(iii) along the cutting line (C2) of the shape of the overlapping slice-shaped polarizing film (5), cut the obtained strip-shaped optical film laminate (7) to obtain a polarizing film and a retardation film overlapping a parallelogram optical film stack (8),

(iv) The obtained parallelogram-shaped optical film stack ( 8 ) is cut.

In such a manufacturing method, as shown in FIG. 3, a parallelogram having two parallel sides forming an angle (φ) equal to the angle (θ) with respect to its longitudinal direction is cut out from a strip-shaped polarizing film (4). In this case, if a retardation film having a slow axis (2) parallel to its longitudinal direction is used as a strip-shaped retardation film (6), parallel polarizing films can be obtained. A trapezoidal optical film stack (3) with two sides (upper base (AB) and lower base (DC)) parallel to the slow axis (2) of the retardation film.

The parallelogram-shaped optical film laminate (8) is cut along the cutting line (C3) at an angle of φ2 with respect to the two edges (IJ, KL) of the strip-shaped retardation film, but here the cutting line (C3) ) with respect to the angle (φ2) of the two edges (IJ, KL) of the strip-shaped retardation film is under the situation of 90 °, one side (AD) of the obtained optical film laminate (3) is perpendicular to the mutually parallel Both sides (AB, DC) (Figure 3). In addition, this angle (φ2) may be larger than 90° (FIG. 4) and may be smaller than 90° (FIG. 5).

When the angle (φ2) is (180°-θ2) (Fig. 3, Fig. 4, Fig. 5), one side (AD) of the obtained trapezoidal optical film stack (3) is aligned with the target optical film Since the reference side (90) of the film stack chip (10) is parallel, the side (AD) can be used as a line to start cutting out the optical film stack chip (10).

On the other hand, as shown in FIG. 6, a parallelogram having two parallel sides forming an angle (φ) equal to the angle (θ-90°) with respect to its longitudinal direction is cut out from the strip-shaped polarizing film (4). In this case, if a retardation film having a slow axis (2) perpendicular to its length direction is used as a strip-shaped retardation film (6), parallel polarizing films can be obtained. A trapezoidal optical film stack (3) whose two sides (upper base (AB) and lower base (DC)) are perpendicular to the slow axis (2) of the retardation film.

Here, when the angle (φ2) of the cutting line (C3) with respect to the two edges (IJ, KL) of the strip-shaped retardation film is 90°, one side (AD) of the obtained optical film stack (3) ) perpendicular to the two parallel sides (AB, DC) (Figure 6). In addition, this angle (φ2) may be larger than 90° (FIG. 7) and may be smaller than 90° (FIG. 8).

When the angle (φ2) is (270°-θ2) (Fig. 6, Fig. 7, Fig. 8), one side (AD) of the obtained trapezoidal optical film stack (3) is aligned with the target optical film Since the reference side (90) of the film stack chip (10) is parallel, the side (AD) can be used as a line to start cutting out the optical film stack chip (10).

In addition, the position of the cutting line (C3) of the parallelogram optical film stack (8) can be set arbitrarily, but if the cutting line is selected to pass through the center of gravity of the stack (8), two optical films with the same shape can be obtained. Membrane stack (3).

In addition, in the optical film stacked body of the present invention, the polarizing film (first optical film) and the retardation film (second optical film) are usually superimposed through an adhesive layer, but such an adhesive layer can usually be provided in advance. On one side of the strip-shaped polarizing film (strip-shaped first optical film) (4).

When the shape of the optical film laminate of the present invention is trapezoidal, the optical axis of the first optical film is represented as the hypotenuse constituting the trapezoid, and the optical axis of the second optical film is represented as the upper base and the lower base, or as the upper base and the lower base. Since the bottom vertical side indicates that the optical axis of the first optical film and the optical axis of the second optical film are not mistaken, as a result, a square optical film stacked chip can be cut out with high productivity.

Claims (7)

1. optical film overlapped body is characterized in that:

First blooming and the second blooming overlaid have:

With the parallel or vertical both sides parallel to each other of the optical axis of second blooming;

With respect to this both sides tilt, one side parallel with the optical axis of first blooming; And

With respect to the uneven another side of the optical axis of first blooming;

Described first blooming is a polarizing coating, and second blooming is a phase retardation film.

2. optical film overlapped body according to claim 1 is characterized in that: with respect to the uneven another side of the optical axis of first blooming perpendicular to both sides parallel to each other.

3. optical film overlapped body according to claim 1 is characterized in that: it is to cut out the optical film overlapped body that first blooming and the equitant square optical film overlapped body chip of second blooming are used,

The reference edge that is parallel to optical film overlapped body chip with respect to the uneven another side of the optical axis of first blooming.

4. optical film overlapped body according to claim 1 is characterized in that: both sides parallel to each other are parallel with the optical axis of second blooming, and the optical axis of second blooming is more than 40 °, below 140 ° with respect to the relative angle θ of the optical axis of first blooming.

5. optical film overlapped body according to claim 1, it is characterized in that: both sides parallel to each other are vertical with the optical axis of second blooming, the optical axis of second blooming with respect to the relative angle θ of the optical axis of first blooming greater than 0 °, less than 50 ° or greater than 130 °, less than 180 °.

6. the manufacture method of an optical film overlapped body, described optical film overlapped body has:

First blooming and the second blooming overlaid have:

With the parallel or vertical both sides parallel to each other of the optical axis of second blooming;

With respect to this both sides tilt, one side parallel with the optical axis of first blooming and

With respect to the uneven another side of the optical axis of first blooming;

Described first blooming is a polarizing coating, and second blooming is a phase retardation film.

It is characterized in that this method may further comprise the steps:

(i) set like this cut-out line; The optical axis that namely should cut off angle φ that line consists of with respect to the length direction of first blooming of band shape and second blooming of above-mentioned optical film overlapping element equates with respect to the relative angle θ of the optical axis of first blooming or θ-90 °; Cut off line along this and cut off the first banded blooming; Cut out first blooming of section shape; It has the parallel both sides that consist of above-mentioned angle φ with respect to the optical axis of first blooming; Form the parallelogram that the distance between these both sides equates with the width of second blooming of band shape

The above-mentioned both sides of first blooming that (ii) make the section shape are along two rims of second blooming of band shape, first optical film overlapped on second blooming of band shape with the section shape that obtained, obtain the optical film overlapped body of the superimposed band shape on second blooming of band shape of first blooming of section shape

(iii) along the cut-out line of the shape of first blooming of overlapping section shape, the optical film overlapped body that cuts off the band shape that is obtained obtains the optical film overlapped body of first blooming and the equitant parallelogram of second blooming,

(iv) cut off the optical film overlapped body of the parallelogram that is obtained.

7. the manufacture method of optical film overlapped body according to claim 6, it is characterized in that: along the angle with respect to two rims of second blooming of band shape is the optical film overlapped body that the cut-out line that equals the angle φ 2 of 180 °-θ 2 or 270 °-θ 2 cuts off parallelogram, here, θ 2 is second optical axis angles with respect to the reference edge of optical film overlapped body chip.

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