Optical switching element and image display device
First Claim
1. An optical switching element, comprising:
- a light guide unit having a total reflection surface that can transmit light by total reflection;
a light extraction unit having a transmissive extraction surface, the transmissive extraction surface being movable between a first position at or less than an extraction distance from the total reflection surface such that an evanescent wave can leak, and a second position greater than the extraction distance from the total reflection surface, the light extraction unit being a reflection type which guides extracted light to the transmissive extraction surface, the light extraction unit being provided on a side opposite to an emission side of the optical switching element relative to the light guide unit; and
a spacer and a reflective thin film laminated on the side opposite to the emission side of the optical switching element relative to the light guide via the spacer so that the light extraction unit is supported by the reflective thin film.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides an optical switching element causing less loss of light and permitting high response, thinning of an optical system for illumination, and the realization of an image display device exhibiting precise grayscale properties. In the optical switching element, an extraction surface of a light extraction unit mounted to a thin film is brought into contact with the total reflection surface of a light guide serving as a light guide unit comprising a glass plate or the like for transmitting light by total reflection, or near at a distance from the total reflection, surface for allowing extraction of evanescent waves, to extract the incident light transmitted through the light guide and emit the extracted light to the outside through an emission member. Such optical switching permits the light extract unit to be operated in a range of approximately a wavelength or half a wavelength, thereby providing an optical switching element capable of high-speed operation and having high contrast because the incident light does not leak due to total reflection during an off time.
-
Citations
54 Claims
-
1. An optical switching element, comprising:
-
a light guide unit having a total reflection surface that can transmit light by total reflection;
a light extraction unit having a transmissive extraction surface, the transmissive extraction surface being movable between a first position at or less than an extraction distance from the total reflection surface such that an evanescent wave can leak, and a second position greater than the extraction distance from the total reflection surface, the light extraction unit being a reflection type which guides extracted light to the transmissive extraction surface, the light extraction unit being provided on a side opposite to an emission side of the optical switching element relative to the light guide unit; and
a spacer and a reflective thin film laminated on the side opposite to the emission side of the optical switching element relative to the light guide via the spacer so that the light extraction unit is supported by the reflective thin film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
-
31. An optical switching element, comprising:
-
a light guide unit having a first electrode and,a total reflection surface that can transmit light by total reflection;
a light extraction unit having;
a transmissive extraction surface, the transmissive extraction surface being movable between a first position at or less than an extraction distance from the total reflection surface such that an evanescent wave can leak, and a second position greater than the extraction distance from the total reflection surface; and
a second electrode and an emission member provided on the second electrode on a side of the second electrode opposite the light guide and perpendicular to the first electrode. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
-
Specification