Source: http://www.google.com/patents/US8068710?dq=7,496,943
Timestamp: 2017-12-17 17:55:19
Document Index: 69369719

Matched Legal Cases: ['Application No. 07838811', 'Application No. 08152870', 'Application No. 11160289', 'Application No. 11160294', 'Application No. 11160297', 'Application No. 11160299', 'Application No. 11160304', 'Application No. 07', 'Application No. 200780037248', 'Application No. 200780037248', 'Application No. 07', 'Application No. 08153686', 'Application No. 08152870', 'Application No. 2009', 'Application No. 07', 'Application No. 07']

Patent US8068710 - Decoupled holographic film and diffuser - Google Patents
In various embodiments described herein, a display device includes a front illumination device that comprises a light guide disposed forward of an array of display elements, such as an array of interferometric modulators, to distribute light across the array of display elements. The light guide may include...http://www.google.com/patents/US8068710?utm_source=gb-gplus-sharePatent US8068710 - Decoupled holographic film and diffuser
Publication number US8068710 B2
Application number US 11/952,941
Also published as CN101889224A, EP2068180A1, EP2068180B1, US8798425, US20090147332, US20120069031, WO2009076075A1
Publication number 11952941, 952941, US 8068710 B2, US 8068710B2, US-B2-8068710, US8068710 B2, US8068710B2
Inventors Ion Bita, Gang Xu, Lai Wang, Marek Mienko, Russell Wayne Gruhlke
Patent Citations (449), Non-Patent Citations (68), Referenced by (11), Classifications (15), Legal Events (7)
Decoupled holographic film and diffuser
US 8068710 B2
Accordingly, the display device may further comprise an optical isolation layer 88 b disposed between the glass substrate 85 and the array of interferometric modulators 86. Typically, the interferometric modulators 86 are absorptive structures, for light rays guided at an angle of 45-90 degrees measured from the normal to the display elements. Thus, some of the light propagating through the light guiding portion 81 and incident on the interferometric modulators 86 at an oblique angle may be substantially absorbed by the interferometric modulators 86 after a sufficient number of reflections. In order to reduce, minimize, or prevent this loss of light due to absorption, the optical isolation layer 88 b may be disposed between the glass substrate 85 and the interferometric modulators 86. The optical isolation layer 88 b, as discussed in more detail below, advantageously has an index of refraction substantially lower than the glass substrate 85, such that light traveling through the light guiding potion 81 and striking the glass/optical isolation film interface at an oblique or grazing angle, for example, greater than the critical angle (e.g., greater than 40° or 50°), will be totally internally reflected back into the light guiding portion 81 of the illumination apparatus 80. In various embodiments, the optical isolation layer comprises silicon dioxide, or fluorinated silicon dioxide. Other materials may be employed as well.
In some embodiments, the refractive index of substrate 85 is lower than that of turning film 82. With such a design, some portion of the light incident at large incident angles (e.g. 70° to 90°) on the interface between substrate 85 and the turning features 82 a would be reflected back such that light is guided to the end of the turning film 82 opposite the light source 83. Such a configuration may improve the uniformity of the distribution of light directed onto the display elements 86, for example, when the efficiency of the turning film 82 is high.
Alternatively, the turning features 82 a may comprise a plurality of microprisms extending along the width of the turning film 82. The microprisms may be configured to receive light 5 propagating along the width of the turning film 82 and turn the light 5 through a large angle, usually between about 70-90°. The prismatic microstructures may comprise two or more turning facets angled with respect to one another for reflecting the light via total internal reflection and causing the light to be turned toward the array of display elements 86 at normal incidence or near normal incident thereto. The prismatic microstructures may be included in a film disposed on a carrier. Note that the size, shape, and separation of the turning features may vary. A wide variety of other types of turning films, diffractive, holographic, prismatic, or otherwise are possible. Accordingly, different sizes, shapes, configuration, and arrangements may be employed.
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U.S. Classification 385/133, 359/15, 349/62, 349/122
International Classification G02B6/00, G02F1/1333, G02F1/1335, G02B5/32
Cooperative Classification Y10T29/49826, G02B6/0035, G02B6/0051, G02B5/32, G02B26/001, G02B6/10
European Classification G02B6/00L6O4
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BITA, ION;XU, GANG;WANG, LAI;AND OTHERS;REEL/FRAME:020240/0075