JP2002022914A - Film for diffusion reflector, diffusion reflector liquid crystal display panel, and method for manufacturing film for diffusion reflector - Google Patents

Film for diffusion reflector, diffusion reflector liquid crystal display panel, and method for manufacturing film for diffusion reflector

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Publication number
JP2002022914A
JP2002022914A JP2000203686A JP2000203686A JP2002022914A JP 2002022914 A JP2002022914 A JP 2002022914A JP 2000203686 A JP2000203686 A JP 2000203686A JP 2000203686 A JP2000203686 A JP 2000203686A JP 2002022914 A JP2002022914 A JP 2002022914A
Authority
JP
Japan
Prior art keywords
film
pyramid
pitch
liquid crystal
crystal display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000203686A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Sagou
由志 佐合
Original Assignee
Sharp Corp
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp, シャープ株式会社 filed Critical Sharp Corp
Priority to JP2000203686A priority Critical patent/JP2002022914A/en
Publication of JP2002022914A publication Critical patent/JP2002022914A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a film for a diffuse reflector, a diffuse reflector, a liquid crystal display panel, and a method for producing a film for a diffuse reflector having regular unevenness which does not cause moire even when used for a liquid crystal display panel. I do. SOLUTION: A mold in which concave portions of a quadrangular pyramid are arranged at a diagonal line of a bottom surface at a size S and vertices are arranged at a pitch A is ground. The quadrangular pyramid is ground with a shift of A / (2n + 1) in a direction at an angle of 45 ° to the direction in which the ridge lines are continuous with the mold. Further, grinding is performed by shifting by A / (2n + 1), and a total of (2n + 1) grinding operations are performed. This mold is transferred to a photocurable acrylic resin to form a film for a diffuse reflection plate. Aluminum is formed as a reflective film on the film for the diffuse reflector to obtain a diffuse reflector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film for a diffuse reflector, a diffuse reflector, a liquid crystal display panel, and a method of manufacturing a film for a diffuse reflector used for reflective and transflective liquid crystal display panels.

[0002]

2. Description of the Related Art In recent years, applications of liquid crystal display panels to word processors, laptop personal computers, pocket televisions, mobile phones, and the like have been rapidly advancing. In particular, among liquid crystal display panels, a reflective liquid crystal display panel that reflects light incident from the outside to perform display and a transflective liquid crystal display panel that can use a backlight at night use have low power consumption and are thin. It has attracted attention because it can be reduced in weight.

[0003] Further, in portable telephones and the like, colorization of reflection type liquid crystal display panels has been actively studied, and among them, improvement in the performance of reflection plates has been required.

In order to improve the performance of the reflector, a diffuse reflector is used which can efficiently use light sources from various angles by making the shape of the reflector uneven.

The irregular shape of the diffuse reflection plate is known to be spherical, striped, pyramidal, etc.
Japanese Patent No. 7071 discloses a diffuse reflector film having various structures and regular irregularities. As a method of manufacturing a reflection plate, an embossing method, a method using a mold, and the like are known, and Japanese Patent Application Laid-Open No. Hei 8-227071 discloses a method of using a mold.

[0006]

However, when a diffuse reflector having regular irregularities is used for a simple matrix type liquid crystal display panel such as an STN (super twisted nematic) system, the irregularities of the diffuse reflector and the liquid crystal display are reduced. There is a problem that moire is generated between the display electrodes of the panel and the color filters, and visibility is significantly reduced.

An object of the present invention is to provide a method for producing a diffuse reflector film, a diffuse reflector, a liquid crystal display panel, and a diffuse reflector film having regular irregularities which do not cause moire even when used in a liquid crystal display panel. It is to be.

[0008]

According to the present invention, there is provided a method for producing a film for a diffuse reflection plate, wherein a mold having a plurality of pyramidal concave portions is transferred to a film to form a film for a diffuse reflection plate. A method for manufacturing a film for a diffuse reflection plate, wherein a plurality of pyramid-shaped concave portions are formed so as to be shifted from each other, so that the pyramid-shaped concave portions are overlapped and arranged.

According to the present invention, since a plurality of pyramid-shaped concave portions are formed shifted and a mold in which the pyramid-shaped concave portions are arranged to be transferred is transferred, the pyramid shapes are formed at a plurality of pitches, and moire occurs. A difficult film can be manufactured.

Further, in the present invention, the pyramid shape is a quadrangular pyramid, the shifting direction is a direction forming 45 ° with respect to the direction in which the ridge lines are continuous, and the interval between vertices along the ridge direction of the quadrangular pyramid is pitch A. At this time, the shift amount is A / (2n + 1) (n is a natural number).

According to the present invention, when the ridges are shifted in a direction of 45 ° with respect to the direction in which the ridges are continuous, and the interval between vertices along the ridge direction of the quadrangular pyramid is pitch A, A / (2n + 1)
(N is a natural number)
The quadrangular pyramids are formed at two kinds of pitches, so that moire does not easily occur.

Further, the present invention is characterized in that a length of a diagonal line of a bottom surface of the quadrangular pyramid is larger than the pitch A.

According to the present invention, since the diagonal of the bottom surface of the quadrangular pyramid is larger than the pitch A, the quadrangular pyramids can be densely arranged, and sufficient reflection characteristics can be obtained.

The present invention also relates to a film for a diffuse reflection plate formed by transferring a mold having a plurality of pyramid-shaped recesses, wherein the mold is formed by shifting a plurality of pyramid-shaped recesses. It is a film for a diffuse reflection plate, wherein concave portions having a shape are arranged so as to overlap with each other.

According to the present invention, since a plurality of pyramid-shaped recesses are formed shifted and a mold in which the pyramid-shaped recesses are arranged and transferred is transferred, the pyramid shapes are formed at a plurality of pitches and moire occurs. It becomes difficult.

According to a fourth aspect of the present invention, there is provided a diffuse reflection plate, wherein a metal film is formed as a reflection layer on the diffuse reflection plate film.

According to the present invention, since a metal film is formed as a reflection layer on a film for a diffuse reflection plate, it is possible to obtain a diffusion reflection plate in which quadrangular pyramids are formed at two pitches and in which moire is unlikely to occur. it can.

According to the present invention, there is provided a liquid crystal display panel comprising the film for a diffuse reflection plate according to claim 4 and a display electrode in which the segment electrode and the common electrode are orthogonal to each other. 3B
Where the relationship between the pitch A and the pitch B satisfies -0.15 ≦ 3 (m−0.5) (2n + 1) ≦ 0.15 m: B / A decimal part It is a liquid crystal display panel.

According to the present invention, since the pitch A of the quadrangular pyramids and the pitch B of the electrodes satisfy a predetermined relationship, a liquid crystal display panel free from moire can be obtained.

[0020]

FIG. 1 is a diagram showing a structure of a liquid crystal display panel 1 according to an embodiment of the present invention.

The liquid crystal display panel 1 includes a reflective layer 2, glass substrates 3 and 5, ITO (Indium Tin Oxide) electrodes 4 and 6, a retardation plate 7, a polarizing plate 8 and a liquid crystal 9.

A stripe-shaped IT extending in a direction perpendicular to the plane of FIG.
O electrodes 4 are formed at a pitch B, and an insulating film (not shown) and an alignment film (not shown) are formed thereon. The reflective layer 2 is thermally transferred onto the other opposing transparent glass substrate 5, and a color filter electrodeposition electrode (not shown) is formed thereon, and R, G, B and color are sequentially deposited by an electrodeposition method. A filter (not shown) is formed. A protective film (not shown) is formed thereon, and a stripe-shaped ITO electrode 6 which is orthogonal to the segment electrodes and extends in a direction parallel to the plane of FIG. . Further, an alignment film (not shown) is formed thereon, and the transparent glass substrates 3 and 5 are bonded via a sealing material so that the ITO electrodes 4 and 6 are located inside, and divided into respective liquid crystal display panel sizes. I do. Liquid crystal 9 in gap between transparent glass substrates
And the phase difference plate 7 and the polarizing plate 8 are adhered on the transparent glass substrate 3 to obtain the liquid crystal display panel 1.

FIGS. 2, 3, and 4 are views showing a method for manufacturing the diffuse reflection film of the present embodiment. First, in a first step shown in FIG. 2, a mold in which quadrangular pyramid concave portions are continuous is formed using a quadrangular pyramid shaped tool. In this first step, as shown in FIG. 2, the quadrangular pyramid of the concave portion is pitch A in both longitudinal and lateral ridge directions.
Are formed continuously. That is, the concave portion of the pyramid is formed so as to be continuous in the vertical direction and the horizontal direction, and the concave portion of the quadrangular pyramid is not formed adjacent to the ridge line at 45 °.

When the length of the diagonal of the bottom surface of the quadrangular pyramid is defined as the size S, the figure shows a case where the pitch A is equal to the size S, and the adjacent quadrangular pyramids are consecutive with the same angle.

In the next second step, as shown in FIG. 3, A / (2n + 1)
Grind so that the concave portions of the quadrangular pyramid overlap each other.

In the next third step, as shown in FIG. 4, A / (2n
+1) It is shifted and ground to prepare a mold having the shape shown in FIG.

The mold is subjected to a total of (2n + 1) grinding operations, and this mold is transferred to a photocurable acrylic resin to form a film for a diffuse reflection plate.

At this time, n is a natural number, preferably 1
It is desired that In this case, three quadrangular pyramid concave portions are formed to overlap.

Aluminum is formed as a reflection film on the thus obtained film for a diffuse reflection plate to obtain a diffuse reflection plate. At this time, the diffuse reflection plate may be a reflection plate or a semi-transmission plate regardless of the film thickness.

[0030]

(Example 1) FIG. 2 shows the first step in the method for producing a film for a diffuse reflection plate according to the present invention.

A square pyramid pitch A = 30 μm, size S =
It was formed at 30 μm. Square pyramid concave shape 10 shown in FIG.
A mold in which pyramid-shaped concave portions for arranging were obtained was formed by grinding.

FIG. 5 shows a second step in the method for producing a film for a diffuse reflection plate according to this embodiment. Pitch A = 30 μm
Therefore, when n = 1, the displacement is 30/3 = 1
0 μm.

Therefore, the template obtained in the first step is
Grinding was performed in the same shape by shifting the length and width by 10 μm.

FIG. 6 shows a third step in the method for manufacturing a film for a diffuse reflection plate according to this embodiment. The mold after the second step was further shifted by 10 μm from the previous position, and ground in the same shape.

Using this mold, the irregularities were transferred to a 0.5 mm thick, 300 mm × 400 mm, photocurable acrylic resin having a quadrangular pyramid-shaped projection 10 on the surface, and a diffuse reflection plate shown in FIG. Film was obtained.

On the thus-obtained film for a diffuse reflection plate, aluminum was formed as a reflection film to a thickness of 500 ° by sputtering to obtain a diffuse reflection plate.

The method of manufacturing the liquid crystal display panel 1 has already been described, and will not be described here. However, the drive electrodes were manufactured at the pitch B shown in Table 1.

Table 1 shows the evaluation of moire when the electrode pitch B was changed.

[0039]

[Table 1]

In the above liquid crystal display panel, the moire was evaluated by reflected light. In Nos. 2 and 6, moire was not visually recognized. Although moire was visually recognized at 9, 10, 15, and 16, it was almost unnoticeable, and the visibility was at a level with no problem.

As a result of intensive studies from the results shown in Table 2, it was found that the moiré occurrence conditions tended to be expressed by the following equation. 3 (m−0.5) (2n + 1) (1)

Here, m is a decimal part when the pitch B of the display electrodes of the liquid crystal display panel is divided by the pitch A of the quadrangular pyramid. In the case of 1, since the pitch A = 30 μm and the pitch B = 70 μm, B / A = 70/30 = 2.333..., The decimal part becomes m = 0.333.

In this embodiment, n = 1, and Table 2 shows the result of rearranging Table 1 using the above equation.

[0044]

[Table 2]

As can be seen from Table 2, the value of equation (1) is-
It was confirmed that visibility was satisfied in a portion of 0.15 or more and 0.15 or less. It was confirmed that setting the value of equation (1) to 0 makes moire invisible.

Example 2 Next, when n = 2, a film for a diffuse reflector was prepared in the same manner as in Example 1. At this time, in the first step of the first embodiment, the vertical and horizontal
m, and aluminum was sputtered similarly to obtain a diffuse reflection plate.

At this time, the pitch B of the liquid crystal display panel is 7
As a result of checking moiré at 5 μm, no moiré was visually recognized and a good liquid crystal display panel was obtained.

When pitch B = 75 μm and n = 2, the value of equation (1) becomes 0, which satisfies the above condition.

(Example 3) A liquid crystal display panel was prepared in the same manner as in Example 1, and the diffused light reflectance when the size S, which is the diagonal of the bottom surface of the quadrangular pyramid, was changed was measured.
At this time, the electrode pitch B = 75 μm, the square pyramid pitch A = 30, and the reflectance when the size S = 30 μm was 1. Table 3 shows the results.

[0050]

[Table 3]

As shown in Table 3, if the size S of the quadrangular pyramid is equal to or larger than the pitch A, it is found that the characteristics do not deteriorate.

Comparative Example 1 FIG. 8 shows an example of a conventional diffuse reflection plate. In this comparative example, in the present invention, the number of steps is 2
Times (even number 2n).

A mold having pyramid-shaped recesses for obtaining the recessed shape 10 shown in FIG. 8 was prepared, and this mold was used to form a 0.5 mm-thick 300 mm.times. A 400 mm polyimide diffuse reflection plate film was prepared. At this time, the pitch of the quadrangular pyramids A = 30
μm, size S = 30 μm.

Aluminum was formed as a reflective film on the thus-obtained film for a diffuse reflector by sputtering at a film thickness of 500 ° to obtain a diffuse reflector.

The method of manufacturing the liquid crystal display panel 1 has already been described, and will not be described here. However, the drive electrodes were manufactured at a pitch B shown in Table 4.

Table 4 shows the evaluation of moire when the electrode pitch B was changed.

[0057]

[Table 4]

As a result of evaluating the moire with the reflected light in the liquid crystal display panel, moire occurred under all conditions, and there was a problem in visibility as the liquid crystal display panel.

(Comparative Example 2) Next, as a comparative example, a liquid crystal display panel was prepared under the same conditions as in Table 3 for the display electrode pitch when the number of steps was four (even number (2n)). Moiré was evaluated. As a result, moiré occurred under all conditions, and there was a problem in visibility as a liquid crystal display panel.

Based on the above results, the pitch is set to A / (2n +
1) It has been found that a film for a diffuse reflection plate free from moiré can be produced as a liquid crystal display panel by disposing the pyramid shapes so as to be shifted and producing the electrode and the pyramid pitch so as to satisfy the formula (1).

[0061]

As described above, by using the method for producing a film for a diffuse reflection plate according to claims 1 and 2 of the present invention,
A and A / (2n +
It is possible to create a diffuse reflection film having the two types of 1) in both the vertical and horizontal directions.

As described above, by using the method for manufacturing a film for a diffuse reflection plate according to the third aspect of the present invention, it is possible to arrange unevenness in the closest density, and to obtain sufficient reflection characteristics. Become.

As described above, by using the film for a diffuse reflection plate according to the fourth aspect of the present invention, the pitch can be changed between A and A / A.
By using two types (2n + 1), it is possible to obtain a condition for eliminating the occurrence of moire.

As described above, by using the diffuse reflection plate of claim 5 of the present invention, two types of pitches A, A / (2n
+1) can be obtained.

As described above, by using the liquid crystal display panel according to the sixth aspect of the present invention, it is possible to obtain a liquid crystal display panel free from moire even if a diffuse reflector having regular irregularities is used. Become.

[Brief description of the drawings]

FIG. 1 is a liquid crystal display panel 1 according to an embodiment of the present invention.
FIG. 3 is a diagram showing the structure of FIG.

FIG. 2 is a diagram illustrating a method for manufacturing a diffuse reflection film of the present embodiment.

FIG. 3 is a diagram illustrating a method for manufacturing a diffuse reflection film of the present embodiment.

FIG. 4 is a diagram illustrating a method for manufacturing the diffuse reflection film of the present embodiment.

FIG. 5 is a diagram illustrating a method for manufacturing a diffuse reflection film of the present example.

FIG. 6 is a diagram illustrating a method for manufacturing a diffuse reflection film of the present example.

FIG. 7 is a film for a diffuse reflection plate in Example 1 of the present invention.

FIG. 8 is a conventional film for a diffuse reflection plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid crystal display panel 2 reflective layer 3 transparent glass substrate 4 ITO electrode 5 transparent glass substrate 6 ITO electrode 7 retardation plate 8 polarizing plate 9 liquid crystal

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H042 BA05 BA12 BA14 BA15 BA20 DA00 DA02 DA11 DA21 DC02 DE00 2H091 FA02Y FA08X FA11X FA16Z FB02 FB08 FC01 FC06 GA03 KA10 MA10 5C094 AA03 BA03 BA43 CA19 EA04 EA07 EB04 ED05 FA13

Claims (6)

[Claims]
1. A method for manufacturing a film for a diffuse reflection plate, wherein a mold having a plurality of pyramid-shaped recesses is transferred to a film to form a film for a diffuse reflection plate, wherein the mold shifts the plurality of pyramid-shaped recesses. The method for manufacturing a film for a diffuse reflection plate, wherein the pyramid-shaped concave portions are arranged so as to overlap each other by being formed.
2. The pyramid shape is a quadrangular pyramid, and the shifting direction is a direction forming 45 ° with respect to the direction in which the ridge lines are continuous. When the interval between vertices along the ridge line direction of the quadrangular pyramid is a pitch A, the shifting is performed. 2. The method according to claim 1, wherein the amount is A / (2n + 1) (n is a natural number).
3. The length of a diagonal line of a bottom surface of the quadrangular pyramid is larger than the pitch A.
The method for producing a film for a diffuse reflection plate according to the above.
4. A diffusion-reflecting film formed by transferring a mold having a plurality of pyramid-shaped recesses, wherein the mold is formed by shifting a plurality of pyramid-shaped recesses to form a pyramid-shaped recess. Are arranged so as to overlap with each other.
5. A diffuse reflector, wherein a metal film is formed as a reflective layer on the diffuse reflector plate film according to claim 4.
6. A liquid crystal display panel comprising the film for a diffuse reflection plate according to claim 4 and a display electrode in which a segment electrode and a common electrode are orthogonal to each other, wherein the pitch of the segment electrodes is B and the pitch of the common electrodes is 3
B, the relationship between the pitch A and the pitch B satisfies −0.15 ≦ 3 (m−0.5) (2n + 1) ≦ 0.15 m: B / A decimal part Liquid crystal display panel.
JP2000203686A 2000-07-05 2000-07-05 Film for diffusion reflector, diffusion reflector liquid crystal display panel, and method for manufacturing film for diffusion reflector Pending JP2002022914A (en)

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Applications Claiming Priority (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7401926B2 (en) 2003-03-28 2008-07-22 Seiko Epson Corporation Space light modulating apparatus, projector including same, process for manufacturing microstructure element used in same, and microstructure element manufactured by the same process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7401926B2 (en) 2003-03-28 2008-07-22 Seiko Epson Corporation Space light modulating apparatus, projector including same, process for manufacturing microstructure element used in same, and microstructure element manufactured by the same process

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