JPH054103U - Retarder sheet - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a retardation sheet used for a color compensator of a liquid crystal display, for example, when mixing a retardation value and an axis in a process of combining the liquid crystal display and a polarizing plate. The purpose is not to make a mistake in the angle. [Structure] Releasing films 3, 3'of retardation plate 1 are provided with phase difference axis indications at regular intervals in the phase difference direction, and the axis indications are color bars a, b, c showing phase difference values (retardation values).
Is displayed numerically.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a retardation plate used for a color compensation plate of a liquid crystal display, a retardation plate with a polarizing plate (elliptical polarizing plate), a retardation plate sheet used for measuring instruments and other applications.

[0002]

[Prior Art]

 The mass production of the mono-layer F-STN LCD with a black and white liquid crystal display has progressed, and the product of the birefringence (Δn) of the liquid crystal cell and the cell thickness (d), Δn · d, differs from each company, and the retardation of the retardation plate is different. In the range of 300 to 600 nm, the last digit is 1 nm and the retardation value is finely different, and the combination angle of the polarizing plate and the retardation plate is also in the range of 20 ° to 70 ° depending on the type of liquid crystal cell. It The shipping form is a single plate of retardation plate or an elliptically polarizing plate integrated with a polarizing plate and cut and processed according to the liquid crystal cell, and then commercialized in a chip form. Therefore, there are many combinations of polarizing plate types and retardation plate axial angles, and it was difficult to manage each individually. Further, in the assembling step, the polarizing plate and the retardation plate are individually cut into single plates, combined, and finally punched with specified dimensional tolerances. There was a problem that the phase difference plate was transparent and the retardation values were different from each other, so that even if the individual management of the steps during that time was thoroughly carried out, there were many mistakes.

In general, a protective film is attached to one surface of a retardation plate, an adhesive is applied to the other surface, and a silicone-treated release film is temporarily attached to the surface of a polyester film. There is. Similarly, a protective film is attached to one side of the polarizing plate, and an adhesive layer is formed on the opposite side, and is temporarily attached with a release film. It is easy to make mistakes because the retardation plate, the type of polarizing plate, and the combination axis angle with the polarization axis are various according to the LCD panel design of each company.

[0004]

[Problems to be solved by the device]

 The present invention has been made in view of the above-mentioned problems, and there is no risk of mixing the retardation value or making a mistake in the axis angle, and it is possible to facilitate the process of assembling with the polarizing plate or the liquid crystal display and the equipment management. An object is to provide a retardation sheet.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the retardation sheet of the present invention has the release film of the retardation plate with retardation axis indication at regular intervals in the retardation direction, as described in claim 1, The display is numerically displayed with a color bar showing the phase difference value (retardation value).

[0006]

[Action]

 According to the present invention, since the retardation film and the retardation value are displayed by the color bar on the release film temporarily attached to the retardation film, there is no risk of mixing the retardation value or making a mistake in the axial angle. This greatly simplifies the process of combining with polarizing plates and liquid crystal displays and equipment management.

[0007]

【Example】

 1 (A), (B) and FIG. 2, A and A'indicate a retardation sheet, and 1 indicates the retardation sheet. The retardation plate 1 is a single-plate transparent film, is stretched and oriented in one direction, and has a predetermined retardation value and a retardation axis. A protective film 4 is attached to one surface of the retardation plate 1, and a release film 3 is temporarily attached to the opposite surface via an adhesive layer 2. FIG. 2 shows a laminated structure in which the release films 3 and 3'are temporarily attached to both surfaces of the retardation film 1 via the adhesive layers 2 and 2 '. With a conventional release film, the retardation axis and retardation value cannot be visually confirmed.

Therefore, in the present invention, in the step of temporarily attaching the release film 3 or 3'through the adhesive layers 2 and 2 ', as shown in FIG. 1B, the release film 3 ( Or, on the surface of 3 '), the phase difference value can be calculated by the color bar method in which the three kinds of lines a, b, c are replaced by the numerical value for each color, such as the color numerical value display according to the color display of the small fixed resistor. It is displayed. For example, black …… 0, brown …… 1, red …… 2, orange …… 3, yellow …… 4, green …… 5, blue …… 6, purple …… 7, gray …… 8, white …… The effective number for each color is set as shown in 9 and the line a is set to be slightly wider than the interval between the lines b and c so that the retardation values can be read on the lines a, b and c. Further, the distance D between these lines a, b and c and the adjacent lines a ′, b ′ and c ′ is set to 70 to 100 mm, and the phase difference in the roll direction is applied to the release film surface during the adhesive coating process. If the axes are displayed in color numerical values, they can be easily classified by color even if they are cut into a certain size. Therefore, in the displayed color bar display, if the lines a, b and c (a ', b', c ') are decoded as 100 digits, 10 digits and 1 digit, respectively, the retardation value is in the range of 100 to 1000 nm. Numerical value display can be easily classified with and legible.

Further, when the retardation sheet A, A ′ shown in FIGS. 1A and 1B is used for punching according to the process, as shown in FIG. 3, the surface has a color corresponding to the axial angle. It becomes a bar, and it becomes possible to easily distinguish the axial direction and the retardation value even with a single plate size. FIG. 4 shows an application example of the present invention, in which a retardation sheet A of the type shown in FIG. 1 is attached to a polarizing plate 6 via an adhesive layer 7 to form an elliptically polarizing plate B. FIG. The polarizing plate 6 of B is combined with a reflecting plate (or a semi-reflecting plate) 8 via an adhesive layer 7'to form an elliptical polarizing plate B'with a reflecting plate. The bars a, b, and c are displayed. 4 and 5, the phase difference plate 1 and the polarizing plate 6 form a normal elliptical polarizing plate.

Like the retardation plate sheet A of FIG. 1, if the release film 3 of the retardation plate 1 is numerically displayed by the color bar method, the retardation plate is the original fabric and the retardation plate is the retardation plate. The value is also legible and at the same time the angle of the axis is easily known. In addition, even the separated parts of the other retardation sheet A'shown in FIG. 2, the elliptical polarizing plate B shown in FIGS. 4 and 5 and the elliptical polarizing plate B'with a reflecting plate are separated by the release films 3 and 3 '. The phase difference axis and the polarization axis can be confirmed, and the process, inventory and shipping management will not be mistaken, and handling will be easy.

[0011]

[Effect of the device]

 As explained above, the retardation sheet according to the present invention and the polarizing plate with a retardation sheet (elliptical polarizing plate) to which the present invention is applied can prevent the mixing of retardation value and the axis angle is not mistaken. , A retardation plate or an elliptically polarizing plate, which is mounted on the front or rear surface of a liquid crystal cell and built in, and is used as a black-and-white display element to provide a display with good contrast for a warpro, a personal computer or other display type electronic equipment. It is expected that it will be greatly useful in promoting its application development.

[Brief description of drawings]

FIG. 1A is a sectional view of a retardation sheet showing a first embodiment of the present invention, and FIG. 1B is a plan view thereof.

FIG. 2 is a sectional view of a retardation sheet showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a cutting direction of the retardation sheet of FIG. 1 or FIG.

FIG. 4 is a cross-sectional view showing an elliptically polarizing plate showing an application example of the present invention.

FIG. 5 is a cross-sectional view of an elliptical polarizing plate with a reflecting plate showing another application example of the present invention.

[Explanation of symbols]

 A, A'Phase retarder sheet B Elliptical polarizing plate B'Elliptical polarizing plate with reflector 1 Phase difference plate 2,2 'Adhesive layer 3,3' Release film 4 Protective film 6 Polarizing plate 7,7 'Adhesive layer 8 Reflection Board

Claims (1)

[Claims for utility model registration] [Claim 1] The release film of the retardation plate is provided with a phase difference axis display at regular intervals in the phase difference direction, and the axis display shows a phase difference value (retardation value). A retardation plate sheet characterized by being numerically displayed.