Film sensor member and method for manufacturing same, circularly polarizing plate and method for manufacturing same, and image display device

• US 10,521,062 B2
• Filed: 04/21/2017
• Issued: 12/31/2019
• Est. Priority Date: 04/27/2016
• Status: Active Grant

• Current Assignee: ZEON Corporation
• Original Assignee: ZEON Corporation
• Inventors: Hashimoto, Hiromasa, Osato, Kazuhiro, Kobayashi, Takao
• Primary Examiner(s): Boyd, Jonathan A
• Application Number:
  US16/095,749
• Publication Number:
  US 20190310726A1
• Time in Patent Office: 984 Days
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G02F 1/1333 Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G09F 9/00 Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00
• CPC Class Codes: H05B 33/02 Details
• CPC Class Codes: H10K 50/00 Organic light-emitting devices integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

A film sensor member for disposing on a visually recognizing side of a linear polarizer in an image display device including the linear polarizer, the member including a transparent electroconductive layer, a λ/4 plate, and a λ/2 plate in this order from the visually recognizing side, wherein the λ/4 plate is formed of a first thermoplastic resin containing an amorphous polymer having a glass transition temperature of 150° C. or higher or a crystallizable polymer having a melting point of 250° C. or higher, the λ/2 plate includes, in this order, a first outer layer formed of a second thermoplastic resin, an intermediate layer formed of a third thermoplastic resin containing an ultraviolet absorber, and a second outer layer formed of a fourth thermoplastic resin, and the λ/2 plate has an NZ factor of 1.1 to 3.0.

Claims

1. A film sensor member for disposing on a visually recognizing side of a linear polarizer in an image display device including the linear polarizer, the member comprising a transparent electroconductive layer, a λ

/4 plate, and a λ

/2 plate in this order from the visually recognizing side, wherein

the λ

/4 plate is formed of a first thermoplastic resin containing an amorphous polymer having a glass transition temperature of 150°

C. or higher or a crystallizable polymer having a melting point of 250°

C. or higher,

the λ

/2 plate includes, in this order, a first outer layer formed of a second thermoplastic resin, an intermediate layer formed of a third thermoplastic resin containing an ultraviolet absorber, and a second outer layer formed of a fourth thermoplastic resin, and

the λ

/2 plate has an NZ factor of 1.1 to 3.0.

2. The film sensor member according to claim 1, wherein

the film sensor member has a long-length shape,

an angle formed by a slow axis of the λ

/4 plate with respect to a lengthwise direction of the film sensor member is 75°

±

5°

,

an angle formed by a slow axis of the λ

/2 plate with respect to the lengthwise direction of the film sensor member is 15°

±

5°

,

an intersection angle formed between the slow axis of the λ

/4 plate and the slow axis of the λ

/2 plate is 55°

to 65°

.

3. The film sensor member according to claim 1, wherein a light transmittance of the film sensor member at a wavelength of 380 nm is 5% or less.

4. The film sensor member according to claim 1, wherein a ratio of “

thickness of the intermediate layer”

/“

thickness of the λ

/2 plate”

is ⅓

to 80/82.

5. The film sensor member according to claim 1, wherein the first thermoplastic resin, the second thermoplastic resin, the third thermoplastic resin, and the fourth thermoplastic resin contain an alicyclic structure-containing polymer.

6. The film sensor member according to claim 1, comprising a hard coat layer disposed on at least one surface of the λ

/4 plate.

7. The film sensor member according to claim 1, wherein the λ

/4 plate and the λ

/2 plate are an obliquely stretched film.

8. The film sensor member according to claim 1, wherein the λ

/2 plate is a sequentially biaxially stretched film.

9. A method for producing the film sensor member according to claim 1, comprising the steps of:

forming the transparent electroconductive layer on one side of the λ

/4 plate; and

bonding the λ

/2 plate on the other side of the λ

/4 plate with a UV curable adhesive.

10. A circularly polarizing plate comprising a linear polarizer and a film sensor member, wherein

the film sensor member includes a λ

/2 plate, a λ

/4 plate, and a transparent electroconductive layer in this order from the linear polarizer side,

the λ

/4 plate is formed of a first thermoplastic resin containing an amorphous polymer having a glass transition temperature of 150°

C. or higher or a crystallizable polymer having a melting point of 250°

C. or higher,

the λ

/2 plate includes, in this order, a first outer layer formed of a second thermoplastic resin, an intermediate layer formed of a third thermoplastic resin containing an ultraviolet absorber, and a second outer layer formed of a fourth thermoplastic resin, and

the λ

/2 plate has an NZ factor of 1.1 to 3.0.

11. A method for producing the circularly polarizing plate according to claim 10, comprising the steps of:

bonding the linear polarizer and the film sensor member with a UV curable adhesive; and

irradiating the UV curable adhesive with ultraviolet light through the linear polarizer.

12. An image display device comprising an image display element, and the circularly polarizing plate according to claim 10 disposed on a visually recognizing side of the image display element.

13. The image display device according to claim 12, wherein the image display element is a liquid crystal cell or an organic electroluminescent element.