Richard A Griffith

US Patent:

6590711, Jul 8, 2003

Filed:

Apr 3, 2000

Appl. No.:

09/541203

Inventors:

Timothy J. Gardner - St. Paul MN
Richard F. Griffith - Edina MN
Lavern L. Linse - Hudson WI
Leo A. Meyer - St. Paul MN
James A. Stevenson - St. Paul MN

Assignee:

3M Innovative Properties Co. - St. Paul MN

International Classification:

G02B 1320

US Classification:

359599, 359606, 359607, 359608

Abstract:

The present invention is a light directing construction for use in a display apparatus. The light directing construction includes a light directing film that has a prismatic structure having two sides, where one side includes saw tooth formations having tilted surfaces, and a metal coating on the side of the prismatic substrate having the saw-tooth formations. A corrosion-resistant feature is provided on the light directing construction to minimize the effects of corrosion experienced in salt atmospheres. In a first embodiment of the invention, the light directing construction includes an intermediate layer positioned between the light directing film and the metal coating. In a second embodiment of the invention, a peripheral polymeric coating is provided on the light directing constriction. This peripheral coating can be formed with a laser.

US Patent:

6626545, Sep 30, 2003

Filed:

Dec 31, 2002

Appl. No.:

10/335334

Inventors:

Timothy J. Gardner - St. Paul MN
Richard F. Griffith - Edina MN

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

G02B 508

US Classification:

359606, 359607, 359608, 359599, 359850

Abstract:

The present invention is a light directing construction for use in a display apparatus. The light directing construction includes a light directing film that has a prismatic structure having two sides, where one side includes saw tooth formations having tilted surfaces, and a metal coating on the side of the prismatic substrate having the saw-tooth formations. A corrosion-resistant feature is provided on the light directing construction to minimize the effects of corrosion experienced in salt atmospheres. In a first embodiment of the invention, the light directing construction includes an intermediate layer positioned between the light directing film and the metal coating. In a second embodiment of the invention, a peripheral polymeric coating is provided on the light directing constriction. This peripheral coating can be formed with a laser.

US Patent:

7695180, Apr 13, 2010

Filed:

Aug 25, 2006

Appl. No.:

11/467230

Inventors:

Craig R. Schardt - St. Paul MN, US
D. Scott Thompson - Woodbury MN, US
Kenneth A. Epstein - St. Paul MN, US
Brian W. Ostlie - Hudson WI, US
Richard F. Griffith - Minneapolis MN, US
Kenneth L. Smith - White Bear Lake MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

F21V 7/04

US Classification:

362625, 362243, 362607, 362609, 362623, 362 29, 362 30, 362 972, 362330

Abstract:

Illumination assemblies and systems using same are disclosed. The illumination assembly can include a reflective substrate, and a light source unit including one or more light sources capable of producing illumination light. The assembly can further include a first light extraction surface including an azimuthal beam widening topography, where the first light extraction surface is positioned such that the light source unit is between the first light extraction surface and the reflective substrate. The first light extraction surface can face the light source unit.

US Patent:

8579492, Nov 12, 2013

Filed:

Oct 29, 2007

Appl. No.:

11/927202

Inventors:

Kenneth A. Epstein - St. Paul MN, US
Richard F. Griffith - Minneapolis MN, US
Alan B. Campbell - Santa Rosa CA, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

F21V 7/04
G02F 1/1335

US Classification:

362626, 349 62

Abstract:

An optical film for use in transparent displays, such as reflective LCDs. The optical film has three-dimensional, prismatic structures that reflect incoming light. The prismatic structures are configured so that the reflecting facets orient the reflected light in desired reflective light pattern. The pattern shape and intensity can be controlled by the shape and dimensions of the various reflecting facets. In one embodiment, the height of the prismatic structure varies along two dimensions of the structure.

US Patent:

20030035231, Feb 20, 2003

Filed:

Aug 3, 2001

Appl. No.:

09/922438

Inventors:

Kenneth Epstein - St. Paul MN, US
Richard Griffith - Edina MN, US
Alan Campbell - Santa Rosa CA, US

International Classification:

G02B005/04
G02B007/18

US Classification:

359/834000, 359/831000, 359/833000

Abstract:

An optical film for use in transparent displays, such as reflective LCDs. The optical film has three-dimensional, prismatic structures that reflect incoming light. The prismatic structures are elongate structures configured so that the reflecting facets orient the reflected light in desired reflective light pattern. The pattern shape and intensity can be controlled by the shape and dimensions of the various reflecting facets. In one embodiment, the height of the prismatic structure varies along the elongate structure.

US Patent:

20030058553, Mar 27, 2003

Filed:

Jul 25, 2002

Appl. No.:

10/205160

Inventors:

Kenneth Epstein - St. Paul MN, US
Richard Griffith - Minneapolis MN, US
Alan Campbell - Santa Rosa CA, US

International Classification:

G02B005/02

US Classification:

359/831000, 359/599000, 359/834000

Abstract:

An optical film for use in transparent displays, such as reflective LCDs. The optical film has three-dimensional, prismatic structures that reflect incoming light. The prismatic structures are configured so that the reflecting facets orient the reflected light in desired reflective light pattern. The pattern shape and intensity can be controlled by the shape and dimensions of the various reflecting facets. In one embodiment, the height of the prismatic structure varies along two dimensions of the structure.

US Patent:

20050024754, Feb 3, 2005

Filed:

Jun 25, 2004

Appl. No.:

10/877341

Inventors:

Kenneth Epstein - St. Paul MN, US
Richard Griffith - Minneapolis MN, US
Alan Campbell - Santa Rosa CA, US

International Classification:

F21V007/04

US Classification:

359831000, 359599000

Abstract:

An optical film for use in transparent displays, such as reflective LCDs. The optical film has three-dimensional, prismatic structures that reflect incoming light. The prismatic structures are configured so that the reflecting facets orient the reflected light in desired reflective light pattern. The pattern shape and intensity can be controlled by the shape and dimensions of the various reflecting facets. In one embodiment, the height of the prismatic structure varies along two dimensions of the structure.