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Double-sided turning film

A technology of turning film and backlight device, which is applied in applications, instruments, household appliances, etc., can solve problems such as complex stacking schemes, and achieve the effect of improving on-axis brightness levels and compact solutions

Inactive Publication Date: 2008-12-17
ROHM & HAAS DENMARK FINANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lamination schemes can prove complex as heat generated during lamination transfer can affect the dimensional accuracy of the plastic sheet material used

Method used

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Examples

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manufacture example

[0241] The same manufacturing apparatus as shown in FIG. 18 was used to prepare the turning film 36 . For this setup, two steel rolls, each 5 inches in diameter and 41 / 4 wide, were used as patterning rolls 108 and 130 . Each patterned roll was engraved to form the functional elements described with reference to FIG. 5A , ie, R=75 μm, P=Q=50 μm, α=β=34°. One roller has a prism structure and the other roller has a lenticular structure. Both rollers have inner grooves through which cooling (or heating) oil passes, so that the roller surface temperature can be controlled within the desired range. Oil flowing into and out of the rollers passes through rotary joints connected to both ends of each roller.

[0242] Patterning rolls 108 and 130 are mounted on a machine. A patterning roller 108 for forming prismatic structures is mounted on a pre-fixed drive shaft. The patterning roller 130 used to form the lenticular structure is mounted on a shaft which is displaced under pressure...

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Abstract

The invention relates to a double-sided turning film for backlight device, comprising a side-lit light source (1), a light guide plate (2) and a turning film (3) which is composed of a light entry surface and a light exit surface comprising lenticular elements on the exit surface and prismatic structures on the entry surface, wherein the average values of the parameters of the features and the thickness of the film are selected to provide a peak output angle of +-10 DEG from normal to the light exit surface of the light guide plate and an optical gain of at least 1.25. Also disclosed are methods of making the turning film and a display incorporating the backlight.

Description

technical field [0001] The present invention generally relates to display lighting with enhanced luminous intensity by turning films, especially turning films having microstructures on both surfaces. Background technique [0002] Portable liquid crystal displays (LCDs) for laptop computers and other personal computing and communication devices require compact and relatively efficient backlight units. In many LCD displays for single viewer use, only narrow viewing angles are required. An efficient backlight unit providing illumination mainly towards the viewer, ie in the normal direction, meets this requirement and requires less power, thus saving battery power. In addition, the narrow viewing angle LCD protects privacy, which is very important when using LCD in public places. [0003] One approach to providing the desired type of illumination is to utilize light directed into a light guide plate (LGP), typically in combination with one or more films that redirect and condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02B5/04G02B3/00G02F1/1335
CPCB29D11/00663G02B6/0053G02B6/0065G02B5/04G02B5/02G02F1/1335
Inventor 米向东R·D·博姆巴R·P·布尔德拉斯M·L·弗纳利J·格林纳L·P·小哈里斯塔雷和荣S·C·梅斯纳S·J·尼尔巴施R·L·沃尔顿J·M·帕马里石川智弘
Owner ROHM & HAAS DENMARK FINANCE
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