41results about How to "Improve light use efficiency" patented technology

Provided is a near-field light generating element in which reduced is the propagation loss of excited surface plasmon that propagates to the near-field light generating end. The element comprises: a waveguide through which light for exciting surface plasmon propagates; and a plasmon antenna comprising a near-field light generating end and a propagation surface or edge. The propagation surface or edge extends to the near-field light generating end, and causes surface plasmon excited by the light to propagate thereon. Further, a portion of the side surface on the near-field light generating end side is opposed to the propagation surface or edge with a predetermined distance so as for the light to be coupled with the plasmon antenna in a surface plasmon mode. In this configuration, surface plasmon can propagates without significantly changing its wavenumber, which leads to a less propagation loss, and to an improved light use efficiency.

A light guide plate has a light guide plate member having a light incident surface on an end face of the light guide member, and a light emitting surface on a front surface of the light guide plate member, wherein the light incident surface is structured to have light incident thereon, and wherein the light emitting surface is structured to widen and emit light incident thereon out of the light guide plate member, and a directivity changing unit arranged on a light incident end portion of the light guide plate member on the front surface or a back surface of the light guide plate member. The directivity changing unit has a first inner inclined surface and a second inner inclined surface that change a directivity of the incident light within the directivity changing unit to widen the light laterally with respect to a direction perpendicular to the light incident surface.

A two-dimensional image formation apparatus according to the present invention is provided with laser sources (1a)˜(1c), diffusers (6a)˜(6c) for diffusing light, illumination optical systems for irradiating the diffusers (6a)˜(6c) with lights emitted from the laser sources (1a)˜(1c), diffuser vibration units (13a)˜(13c) for vibrating the diffusers (6a)˜(6c), and spatial light modulators (7a)˜(7c) disposed near the diffusers (6a)˜(6c), for modulating the lights emitted from the laser sources (1a)˜(1c) and diffused by the diffusers (6a)˜(6c), wherein the diffusers (6a)˜(6c) are vibrated by the diffuser vibration units (13a)˜(13c) at a velocity that satisfies a relationship, V>d×30 (millimeters/sec), which is established between the grain size d of the diffusers and the vibration speed V of the diffusers, whereby speckle noise existing in an image projected on a screen (11) can be effectively reduced.

A collimator lens unit includes at least two lenses and substantially collimates a beam of light emitted from a solid-state light source unit of a Lambert emission type, wherein at least two faces of incidence faces and emission faces of the lenses constituting the two lenses are aspheric faces, one front aspheric face located close to the solid-state light source unit has a function of changing a luminous flux density distribution of the beam of light emitted from the solid-state light source unit to a predetermined luminous flux density distribution in which the luminous flux density in the vicinity of an optical axis of the collimator lens unit is higher than the luminous flux density in a peripheral portion separated from the optical, the rear aspheric face farthest from the solid-state light source unit has a function of substantially collimating the beam of light.

In a light guide plate 63, a light introducing unit 65 having a thickness larger than that of a light guide plate body 64 is provided at an end of the light guide plate body 64. A point source of light 62 is placed so as to face an end face of the light introducing unit 65 (a light incident end face 66) . The light introducing unit 65 has a protruding portion in a shape of a half of a frustum of a cone protruding from a surface on the light guide plate 63 to have a large thickness, and the protruding portion has an outer perimeter surface forming an inclined surface 67. On the inclined surface 67, V-groove structures 68a are arranged along the outer perimeter surface of the protruding portion to configure a directivity conversion pattern 68. Furthermore, on an inner perimeter portion of the directivity conversion pattern 68, an auxiliary inclined surface 71 having an angle of inclination smaller than the angle of inclination of the inclined surface 67 is formed along an inner perimeter edge of the directivity conversion pattern 68.

A low cost transflective type liquid crystal display is provided which can display a bright image with high contrast under both indoor and outdoor illumination environments. The liquid crystal display performing transmission type display and reflection type display, includes: a plurality of pixels surrounded on a substrate 10 by a plurality of gate electrodes 11 and a plurality of source electrodes 15 arranged perpendicularly to the gate electrodes; a switching element 19 arranged in each pixel and disposed neat at the intersection between each gate electrode and each source electrode; and a pixel electrode 16 connected to the switching element, wherein the pixel electrode is constituted of a transparent conductive layer and a conductive member 17 having a light reflection function and electrically connected to the transparent conductive layer.

A lighting unit includes a planar lighting component that emits illuminating light; a first light deflector having a prismatic face on one surface, the first light deflector being disposed on the planar lighting component; a second light deflector having a prismatic face on one surface, the second light deflector being disposed on the first light deflector, wherein the one surface of the first light deflector is opposite the one surface of the second light deflector, and the direction of tilt of the prismatic face of the first light deflector is perpendicular to the direction of tilt of the prismatic face of the second light deflector.

The invention provides a light emitting keyboard and a light guide plate module thereof. The light emitting keyboard comprises a light emitting element, a thin film circuit board, a plurality of press keys and the light guide plate module, wherein the press keys correspond to a plurality of thin film switches on the thin film circuit board and are communicated with the thin film switches, the light emitting element is used for providing light rays for the light emitting keyboard, the light guide plate module comprises a first reflective layer, a second reflective layer and a light guide layer, the light guide layer is positioned between the first reflective layer and the second reflective layer, and is provided with a plurality of light emitting areas and a gap area, the light emitting areas correspond to the press keys, the gap area is positioned outside the light emitting area, each light emitting area is provided with light guide points, and the gap area is provided with a light diffusion structure.

The invention is a backlight module comprising a transparent substrate partitioned into multi areas, a grating structure located at the incident face of each area, and astigmatism structure of optical face used for receiving the incident light. The transparent substrate can be used to make partition sequential scan so as the grating structure can shorten the light-mixing distance; said astigmatism structure can evenly scatter the light out of the light-guiding plate.

A backlight unit 12 according to the present invention includes an LED board 18 including an LED 17 as a light source, a chassis 14 that stores the LED board 18 therein and has an opening 14b through which the light from the LED 17 exits, a chassis reflection sheet 22 that is arranged along an inner surface of the chassis 14 and reflects light and a board reflection sheet 23 that overlaps the LED board 18 on the side of the opening 14b in a plan view, is larger than the LED board 18 and reflects light, and the chassis 14 has a first supporting portion 27 supporting the LED board 18 and a second supporting portion 28 that is arranged closer to the opening 14b than the first supporting portion 27 and supports the board reflection sheet 23.

An illumination apparatus includes light sources; a light guide plate guiding lights from the light sources; a housing holding the light sources and the light guide plate;

and an apparatus attachment part. The light sources are arranged around the apparatus attachment part 5, and the light guide plate 3 is provided outside the apparatus attachment part to face the housing and cover a front side of the light sources. The light guide plate includes a main light guide part guiding lights from the light sources toward an outer periphery of the light guide plate and scattering and emitting the lights to a surface of the main light guide part; and an auxiliary light guide part integrated with the main light guide part at an inner peripheral side of the main light guide part and guiding and emitting the lights from the light sources toward the central portion of the housing.

The invention discloses a backlight module, which comprises a light guide plate, a light source and a light transmission elastic body. The light guide plate is provided with a first light emitting surface, a bottom surface opposite to the first light emitting surface and at least one light incident surface contacted with the first light emitting surface and the bottom surface. The light source is arranged beside the light incident surface and comprises a circuit board and a plurality of LED devices. Each LED device is suitable for emitting the light penetrating through the light incident surface and is electrically connected to the circuit board. The light transmission elastic body is arranged between the light incident surface and the LED devices.

A liquid crystal display (LCD) includes an image display unit, a backlight unit that supplies light to the display unit, and an optical film unit including a diffusion sheet and a prism sheet disposed between the display and the backlight units. The prism sheet includes right angle prisms and acute angle prisms that are greater in height than the right angle prisms, which are formed together in the prism film. The arrangement of prisms enables light that would otherwise be lost inside of the display to be recycled, thereby providing an increase in the efficiency of light use by the display and an increase in the angle at which light exits it.

An illumination system including a light guide element and at least one light source device is provided. The light source device includes a first light combination module disposed near the light guide element and having a first filter film, a second light combination module having a second filter film, at least one first light source, at least one second light source and at least one third light source. There is a gap between the first and second light combination modules. A first light from the first light source is reflected to the light guide element by the first filter film, and a second light from the second light source and a third light from the third light source pass through the first filter film. The second light is reflected to the light guide element by the second filter film, and the third light passes through the second filter film.

A projection display apparatus includes a light source, a light intensity equalizing element, a reflective light valve, a relay optical system, and a projecting optical system; the light intensity equalizing element being an optical device in which a cross-sectional shape in a direction orthogonal to a central axis of the light has four corners; the cross-sectional shape of the light intensity equalizing element being determined in accordance with a rectangular ideal illumination area determined so as to include the image forming area on the reflective light valve, an illumination area on the reflective light valve when a reference light intensity equalizing element is assumed to be used, the reference light intensity equalizing element being rectangular in a cross-sectional shape in a direction orthogonal to the central light ray, and the cross-sectional shape of the reference light intensity equalizing element.

An objective lens optical system focuses a light beam with a wavelength λ₁ on an information recording surface of a first optical recording medium including a transparent substrate with a thickness t1, a light beam with the wavelength λ₁ on an information recording surface of a second optical recording medium including a transparent substrate with a thickness t2, and a light beam with a wavelength λ₃ on an information recording surface of a third optical recording medium including a transparent substrate with a thickness t3, by using a refraction action. Sectioning the area of the objective lens optical system is applied to a compatible technique for the same wavelengths, and generating an aberration for canceling a chromatic aberration caused by a difference in wavelength λ of the light beam is applied to a compatible technique for different wavelengths.

The present invention provides a porous electrode comprising a porous film (A) with through pores and an electrically conducting material selected from the group consisting of conductor and semiconductor, the porous film (A) having an average pore size d1 of from 0.02 to 3 m and a porosity of from 40 to 90%, the electrically conducting material being filled in the through pores of the porous film (A) . A dye-sensitized solar cell and an electric double layer capacitor including the porous electrode as a constituent are also disclosed.

The invention provides a light-emitting keyboard which comprises a thin-film circuit board, key structures and light-emitting elements, wherein the key structures are used for conducting a thin-film switch of the thin-film circuit board and each comprises a keycap, a connecting element and a soft shielding cover. The connecting element is located between the thin-film circuit board and the keycapand enables the keycap to move up and down relative to the thin-film circuit board. The soft shielding cover is connected to the keycap and surrounds the connecting element, and is used for projectingthe light beams provided by at least some of the light-emitting elements to the soft shielding cover and generating reflection on the soft shielding cover, so as to further output the light from thelight-transmitting part of the keycap. In this way, the use efficiency of the light is improved.

An optical member 15 of the present invention includes a lens sheet 28, a light diffusing sheet 27 and light reflecting members 24. The lens sheet 28 has a plurality of convex lenses 29 on an inner surface thereof. The light diffusing sheet 27 is disposed so as to face the lens sheet 28 and diffuses light. The light reflecting members 24 are selectively arranged in boundary areas of the plurality of convex lenses 29 between the lens sheet 28 and the light diffusing sheet 27. The lens sheet 28 has a surface having a light guiding direction and a non-light-guiding direction that crosses the light guiding direction because the convex lenses 29 have anisotropy for collecting light. The light diffusing sheet 27 has diffuseness larger in the light guiding direction of the lens sheet 28 than in the non-light-guiding direction of the lens sheet 28.

The invention provides a light-emitting fan. The light-emitting fan comprises a supporting structure, a main circuit board, a light guide fan wheel and a light-emitting module; the light guide fan wheel is pivoted on a bracket of the supporting structure; and the light-emitting module is arranged in a hub of the light guide fan wheel, and a light-emitting unit of the light-emitting module emits light to the adjacent lens elements and transmits the light to the light guide fan wheel through refraction of secondary lens of the lens elements, so that the light guide fan wheel emits the light.

An illuminating device includes: light source (101); light guiding means (102) where light from light (101) is supplied to one end surface, and light incident from the one end surface is propagated inside to exit from the other end surface; illuminating optical systems (103 to 107) that form an optical image formed on the other end surface of light guiding means (102) on display element (22); reflective polarizing plate (109) that is located between illuminating optical systems (103 to 107) and display element (12), and transmits first polarized light while reflecting second polarized light whose polarized state is different from the first polarized light toward illuminating optical systems (103 to 107); phase plate (108) located between light guiding means (102) and reflective polarizing plate (109); and reflecting means (21) that is located on a side opposite the one end surface of light guiding means (102), and reflects, among lights by reflective polarizing plate (109), light incident via phase plate (108), illuminating optical systems (103 to 107), and light guiding means (102) toward the one end surface of light guiding means (102). The light emitting center of light source (101) is shifted from a center axis of light guiding means (102).

An optical pickup device for reproducing and recording the optical disc information having different thicknesses includes an objective lens which focuses the light from the light source on the optical discs focusing section. The objective lens contains a paraxial region, an abaxial region, and a middle abaxial region locating between the paraxial region and the abaxial region and controlling the light incident to the region, and the said objective lens has different focuses on the same optical axis according to the different thickness. When the thin discs are used, the spot focused on theoptical discs focusing section contains the incident light from said paraxial region and abaxial region; when the thick discs are used, the spot focused on theoptical discs focusing section contains the incident light from said paraxial region.