Abstract:
A display device comprises a liquid crystal spatial light modulator (1) associated with diffractive means, such as a diffraction grating comprising grating elements (5). The diffraction grating is illuminated by a light source (6, 7) and each element is chirped and blazed so as to separate the primary colours of the illuminating light and direct them to individual light-modulating elements (R, G, B) of the modulator (1). By dispensing with conventional colour filters, the efficiency of the display device is improved. Further, the focusing action of the grating elements (5) directs light to the elements of the modulator (1) so as to prevent light wastage caused by blocking of light by opaque regions of the display.
Abstract:
The invention provides an optical space switch device which provides variable interconnection of one- or two-dimensionally spatially multiplexed optical signals. The optical space switch device comprises a plurality of optical space switch stages stacked to form a multi-input multi-output optical space switch. Each of the optical space switch stages comprises a plurality of 2-input 2-output optical switches, each of which comprises polarization controlling means (10) and optical path shifting means (20) which has a bypass mode in which it outputs beams of light along optical axes and an exchange mode in which it shifts beams of light by diffraction.
Abstract:
5 n7 In a color liquid crystal display device (21) of the invention, light-blocking members (F) of predetermined configurations (characters, graphics etc.) are disposed on the surface of one side of a liquid crystal display element (23), that is to say the surface on the side opposite to the light source (22), and the predetermined configurations are displayed on the color liquid crystal display device (21) by blocking the light from the light source (22) with the light-blocking members (F). Further, a light-scattering plate (24) is disposed between the light source (22) and the liquid crystal display element (23), or between the liquid crystal display element (23) and the light-blocking members (F). It is possible to allow transmission of a part of the light blocked by the light-blocking members (F) by scattering the light which is transmitted through the liquid crystal display element (23) with the arrangement of the light-scattering plate (24). Therefore, around the periphery of the light-blocking members (F), the color balance of the transmitted light breaks down and only a specific color of light is transmitted, thereby preventing the colored and blurred appearance of the peripheral part of the light-blocking members (F). Based upon this, the display quality of the color liquid crystal display device (21) is markedly improved.
Abstract:
An optical reconstruction filter in the form of a phase dlffraction grating (31) (that is, a diffractive diffuser) placed between a flat panel liquid crystal color matrix display (30) and a viewer to optically filter flat panel images and present a higher quality image to the viewer.
Abstract:
PROBLEM TO BE SOLVED: To provide an optical element enabling development and extinction of diffraction grating, and capable of changing a grating cycle of the developed diffraction grating.SOLUTION: An optical element includes: a pair of substrates facing with each other; a plurality of electrodes arranged on one substrate of the substrates; an electrochromic layer formed to make contact with the plurality of electrodes; counter electrodes arranged facing the plurality of electrodes, interposing the electrochromic layer. One electrode of neighboring electrodes in the plurality of electrodes has an insulation layer between a substrate. The thickness of the insulation layer is larger than the thickness of the other electrode of the neighboring electrodes.