OPTICAL SHEET, IMAGE SOURCE UNIT, DISPLAY DEVICE, PROCESS FOR PRODUCING OPTICAL SHEET, AND METHOD FOR MANUFACTURING DISPLAY DEVICE

• US 20110146904A1
• Filed: 03/02/2011
• Published: 06/23/2011
• Est. Priority Date: 09/25/2007
• Status: Active Grant

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: NIIJIMA, Takayuki, KASHIWAGI, Tsuyoshi
• Granted Patent: US 8,405,910 B2
• Time in Patent Office: Days
• US Class Current: 156/278
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02B 5/223 containing organic substances, e.g. dyes, inks or pigments
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor

Abstract

There is provided: an optical sheet, which has excellent productivity while maintaining an optical performance and can reduce a manufacturing cost; an image source unit; a display device; a method for producing an optical sheet; and a method for manufacturing a display device.

An optical sheet 10 is disposed on an observer side relative to an image source and comprises a plurality of layers that control light emitted from the image source to emit the light on the observer side, wherein at least one of the plurality of layers is a base material layer 16; one layer disposed on one side of the base material layer is an optical functional sheet layer 11, which comprises prisms 12 being arranged in parallel along the sheet surface of the optical sheet whereby light can be transmitted and light-absorbing parts 13 being arranged in parallel between the prisms whereby light can be absorbed; one layer disposed on the other side of the base material layer is an adhesive layer 17; and an adhesive layer is not provided on a side surface of the optical functional sheet layer facing the side disposed with the base material layer.

Claims

1. A method for manufacturing an optical sheet, which comprising the steps of:

forming, on one surface of a base material as a sheet-shaped member, prisms to be arranged in parallel along the sheet surface of the optical sheet in a manner to transmit light;

forming light-absorbing parts between the prisms; and

after formation of the prisms and the light-absorbing parts, applying an adhesive directly on the other surface of the base material.

2. A method for manufacturing a display device, which comprising the steps of:

producing the optical sheet in accordance with the method of claim 1; and

disposing the optical sheet on an observer side relative to a plasma display panel.

3. The method for manufacturing the display device according to claim 2, further comprising the step of adhering the adhesive of the optical sheet to the plasma display panel to adhere the optical sheet directly to the plasma display panel.

4. A method for manufacturing an optical sheet, comprising the steps of:

applying an adhesive directly on one surface of the base material of a sheet-shaped member;

forming, on the other surface relative to the adhesive-applied surface of the base material, prisms to be arranged in parallel along the base material in a manner to transmit light; and

forming light-absorbing parts between the prisms.

5. A method for manufacturing a display device, which comprises the steps of:

producing the optical sheet in accordance with the method of claim 4; and

disposing the optical sheet on an observer side relative to a plasma display panel.

6. The method for manufacturing the display device according to claim 5, further comprising the step of adhering the adhesive of the optical sheet to the plasma display panel to adhere the optical sheet directly to the plasma display panel.