Abstract: A light guide plate for guiding light includes a light-incident portion allowing light generated from a light source to be incident thereon, a light-facing portion opposite to the light-incident portion, and a first prism pattern disposed between the light-incident portion and the light facing portion and substantially normal to a path of light incident from the light-incident portion to the light-facing portion path.

Abstract: An optical sheet includes a base film and a light-concentrating member. The light-concentrating member includes light-concentrating protrusions and is disposed on the base film. Each of the light-concentrating protrusions includes first to fourth surfaces. The first and second surfaces are extended from the upper surface along an exterior surface of a first and second cylinder in a clockwise and a counterclockwise direction, respectively. The first and second cylinders have first and second axes that are substantially parallel to each other. The third and fourth surfaces are extended from the upper surface along an exterior surface of a third cylinder in clockwise and counterclockwise directions, respectively. The third axis is substantially perpendicular to the first central axis.

Abstract: A monolithic light guiding and dispersing plate is provided in a backlighted display panel for receiving input light from one or more edge sources and for guiding the received light throughout the plate for substantially uniform reflection upwardly and substantially uniform dispersal toward an image forming plane located above the light guiding and dispersing plate. In one embodiment, the light guiding and dispersing plate has a light receiving surface upon which the light generated by an edge light source is incident, a top major surface which is adjacent to the light receiving surface and on which a plurality of first protrusions are formed and elongated in a first direction, wherein the first protrusions have cross-sections in the shapes of partial ellipses. The plate further has a bottom major surface in which light reflecting recesses are defined to reflect light upwardly towards the top major surface.

Abstract: A backlight assembly, usable in a display device, includes a plurality of light sources and a light guiding plate guiding light emitted from the light sources, wherein the light sources are arranged corresponding to a side of the light guiding plate and the side includes a central portion. The light sources include first light sources as a first group arranged on the central portion of the light guiding plate, and second light sources as a second group adjacent to the first group, wherein a pitch of the first light sources is smaller than a pitch of the second light sources.

Abstract: Disclosed herein are a light guide plate, a backlight assembly including the light guide plate, and a liquid crystal display device including the backlight assembly which can uniformly maintain the brightness uniformity and prevent the moiré phenomenon. The light guide plate in accordance with the present disclosure includes: an incident surface, to which light generated from a light source is incident, including a diffusion pattern formed in a round shape; an emitting surface, through which the light is emitted, including a first prism pattern; and an opposite surface, formed opposite to the emitting surface, including a direction change pattern by which the direction of the light is changed toward the emitting surface.

Abstract: The present invention provides a backlight assembly including a light guide having a plurality of grooves disposed in at least one side, a light source arranged at least one end of the light guide, and a reflecting plate arranged below the light guide to reflect light emitted from the light guide.

Abstract: A backlight assembly, usable in a display device, includes a plurality of light sources and a light guiding plate guiding light emitted from the light sources, wherein the light sources are arranged corresponding to a side of the light guiding plate and the side includes a central portion. The light sources include first light sources as a first group arranged on the central portion of the light guiding plate, and second light sources as a second group adjacent to the first group, wherein a pitch of the first light sources is smaller than a pitch of the second light sources.

Abstract: A high-speed search method in a speech encoder using an order character of LSP (Line Spectrum Pair) parameters in an LSP parameter quantizer using SVQ (Split Vector Quantization) used in a low-speed transmission speech encoder, includes the steps of rearranging a codebook according to an element value of a reference row for determining a range of code vectors to be searched; and determining a search range by using an order character between a given target vector and an arranged code vector to obtain an optimal code vector. The method gives effects of reducing computational complexity required to search the codebook without signal distortion in quantizing the LSP parameters of the speech encoder using SVQ, and reducing computational complexity without loss of tone quality in G.729 fixed codebook search by performing candidate selection and search on the basis of the correlation value size of the pulse position index.

Abstract: A backlight assembly includes a light source, a light-guide plate, a reflective sheet, a first prism sheet, a second prism sheet and a lateral reflective sheet. The light source generates light. The light-guide plate guides the light and has a plurality of first prism patterns adjacent to each other. The first prism patterns are formed on a first surface of the light-guide plate. The reflective sheet is disposed adjacent the first surface of the light-guide plate. The first and second prism sheets are disposed on a second surface of the light-guide plate. The lateral reflective sheet is disposed on the second prism sheet. The lateral reflective sheet includes reflective protrusions substantially parallel with a longitudinal direction of the light source. Therefore, brightness and display quality may be enhanced.

Abstract: A dual prism sheet includes a base film, upper prisms formed on an upper surface of the base film and lower prisms formed on a lower surface of the base film. A cross-section of the upper and lower prisms is formed as an isosceles triangular shape having a base and a vertex angle, and a phase of the upper prisms is delayed between about 0 and about 0.5 times of a prism pitch with respect to a phase of the lower prisms.

Abstract: 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.

Abstract: An optical sheet includes a base film and a light-concentrating member. The light-concentrating member includes light-concentrating protrusions and is disposed on the base film. Each of the light-concentrating protrusions includes first to fourth surfaces. The first and second surfaces are extended from the upper surface along an exterior surface of a first and second cylinder in a clockwise and a counterclockwise direction, respectively. The first and second cylinders have first and second axes that are substantially parallel to each other. The third and fourth surfaces are extended from the upper surface along an exterior surface of a third cylinder in clockwise and counterclockwise directions, respectively. The third axis is substantially perpendicular to the first central axis.

Abstract: A light guiding unit that is capable of reducing the thickness of a backlight assembly and operating with fewer light sources is presented. The light guiding unit includes a first surface, a second surface and a light incident surface. The first surface includes a light exiting surface and an upper guiding curved surface that is recessed with respect to the light exiting surface. The second surface includes an opposite surface that is substantially parallel to the light exiting surface and a lower guiding curved surface recessed on the opposite surface toward the first surface, the lower guiding curved surface being positioned along the upper guiding curved surface. The light incident surface is formed on an end portion of the lower guiding curved surface.

Abstract: There is provided a feedback amplifier capable of easily controlling its dynamic range without a separate gain control signal generation circuit. The feedback amplifier includes an input terminal detecting an input voltage from input current, a feedback amplification unit amplifying the input voltage to generate an output signal, and an output terminal outputting a signal amplified by the feedback amplification unit. The feedback amplification unit includes a feedback circuit unit including a feedback resistor located between the input terminal and the output terminal, and a feedback transistor connected in parallel to the feedback resistor; and a bias circuit unit supplying a predetermined bias voltage to the feedback transistor of the feedback circuit unit and merged in the feedback amplification unit.

Abstract: Provided is a method of forming a stress-relaxed SiGe buffer layer on a silicon substrate using a reduced pressure chemical vapor deposition (RPCVD) technique. The method includes: forming a graded composition layer having a predetermined germanium composition gradient on a silicon substrate; forming and thermally annealing a first constant composition layer having a predetermined germanium composition on the graded composition layer; removing the first constant composition layer by a predetermined thickness to planarize a surface; and forming a second constant composition layer on the first constant composition layer to form a SiGe buffer layer having the graded composition layer and the constant composition layer.

Abstract: Provided is a radical assisted oxidation apparatus comprising a gas supply system, a radical source, a growth chamber, a load lock chamber, and a vacuum system, whereby it is possible to manufacture a high quality oxide film at a low temperature and improve a low frequency noise (1/f).

Abstract: An optoelectronic device and a method of manufacturing the same which the optoelectronic effect such as light emission or light reception can be increased by forming a dual-structural nano dot to enhance the confinement density of electrons and holes are provided. The optoelectronic device comprises an electron injection layer, a nano dot, and a hole injection layer. The nano dot has a dual structure composed of an external nano dot and an internal dot. The method of manufacturing the optoelectronic device comprises the steps of forming an electron injection layer on a semiconductor substrate; growing nano dot layer on the electron injection layer by an epi-growth method; heating the nano dot layer so that the nano dot has a dual structure composed of an external nano dot and an internal nano dot; and forming a hole injection layer on the overall structure.

Abstract: A method of searching an MP-MLQ fixed codebook through bit predetermination includes the steps of generating a target vector with amplitude, reducing time to search an optimal pulse array through the bit predetermination and searching all of pulses if two errors have an identical value.

Abstract: A high-speed search method in a speech encoder using an order character of LSP (Line Spectrum Pair) counts in a LSP count quantizer using SVQ (Split Vector Quantization) used in a low-speed transmission speech encoder, includes the steps of rearranging a codebook according to an element value of a reference row for determining a range of code vectors to be searched; and determining a search range by using an order character between a given target vector and an arranged code vector to obtain an optimal code vector.

Abstract: A method for improving process time and speech quality of G.723.1 and reducing bit rate in a CLEP (Code Excited Linear Prediction) voice coder (or, called as vocoder) includes: a method of searching MP-MLQ fixed codebook through bit predetermination includes the steps of generating a target vector with amplitude, reducing time to search an optimal pulse array through the bit predetermination and searching all of pulses if two errors have an identical value; a formant post-filtering method of extracting a reflection coefficient of a slope compensation filter to apply a multi-degree slope compensation thereto; a pitch post-filtering method including an energy level standardization step and a step of generating a signal approximate to an average energy level; a VAD algorithm method using an energy, a pitch gain and a LSP distance; and a method of enhancing a processing time of G.723.