Abstract: There is provided a light emitting diode package having at least two heat sinks. The light emitting diode package includes a main body, at least two lead terminals fixed to the main body, and at least two heat sinks of electrically and thermally conductive materials, the heat sinks being fixed to the main body. The at least two heat sinks are separated from each other. Thus, high luminous power can be obtained mounting a plurality of light emitting diode dies in one LED package. Further, it is possible to embody polychromatic lights mounting LED dies emitting different wavelengths of light each other in the LED package.

Abstract: An LED driving circuit drives LCD backlight LEDs sequentially, reducing LCD display ripple noise without decreasing luminance. The LCD driving circuit includes an LED driving voltage generation unit that generates a driving voltage for a backlight LEDs; a PWM signal control unit that generates PWM output signals having a predetermined duty ratio, shifted at a predetermined time interval; and a switching unit that controls application of the driving voltage to LEDs, responsive to the PWM output signals. A backlight includes LEDs and the LED driving circuit. An LCD having the backlight, and a method for driving the backlight are included.

Abstract: A chip light emitting diode having a wide viewing angle, and a fabrication method thereof. The chip light emitting diode has a resin package sealing a light emitting chip which has at least one curved projecting part. The curved projecting part has a cross section which is substantially semicircular, or substantially or partially elliptical or parabolic. The curved projecting part preferably has a cross section which is comprised of a plurality of straight lines, an angle being formed between adjacent lines. The cross section is elongated to form a cylindrical outer surface of the resin package.

Abstract: A chip light emitting diode having a wide viewing angle, and a fabrication method thereof. The chip light emitting diode has a resin package sealing a light emitting chip which has at least one curved projecting part. The curved projecting part has a cross section which is substantially semicircular, or substantially or partially elliptical or parabolic. The curved projecting part preferably has a cross section which is comprised of a plurality of straight lines, an angle being formed between adjacent lines. The cross section is elongated to form a cylindrical outer surface of the resin package.

Abstract: A liquid crystal display including upper and lower substrates facing each other, electrodes and alignment layers sequentially disposed on and between the upper and lower substrates, a liquid crystal layer interposed between the alignment layers, and a spacer for controlling the distance between the upper and lower substrates, wherein an ion-absorbing material layer coats the spacer. Since an adverse phenomenon caused by generation of ions or contaminants in a liquid crystal cell is prevented, the reliability of the liquid crystal display is improved. Blurriness is prevented from occurring on a displayed picture due to a change in the alignment characteristic of the liquid crystal material. Also, crosstalk and deterioration of contrast are prevented by suppressing a decrease in the specific resistance of the liquid crystal material.

Abstract: An optical alignment polymer and an optical alignment composition having the same are provided. The optical alignment polymer has a compound selected from the group consisting of poly(maleimide), poly(vinyl acetal), poly(phenylene oxide), poly(maleimide styrene) and their derivatives in its main chain, and a photosensitive group at its side chain. The optical alignment polymer can have high level of optical alignment performance and high thermal stability.

Abstract: An optical alignment composition, an alignment layer formed using the same with an excellent liquid crystal alignment property, and an LCD having the alignment layer are provided. The optical alignment composition having excellent thermal stability and alignment property and an alignment layer can be obtained while adopting a non-destructive optical alignment method. Accordingly, an LCD with improved performance can be obtained.

Abstract: An optical alignment polymer having an optical aligning functional group simultaneously introduced into its main chain and side chain, an alignment layer formed using the optical alignment polymer and a liquid crystal display device having the alignment layer are provided. The optical alignment polymer has excellent alignment performance and stability against heat or impact.

Abstract: A heat resistant polymer composition, an alignment layer formed using the same, and an LCD having the alignment layer are provided. The heat resistant polymer composition includes 10-25% by weight of a polyimide resin or polyamic acid, 0.1-1% by weight of an adhesive agent, and balance of a solvent. The adhesive agent improves thermal stability. Thus, the LCD having the alignment layer formed using the same can accomplish a desirable pre-tilt angle of liquid crystals and desirable alignment properties of liquid crystal molecules.

Abstract: A chip light emitting diode having a wide viewing angle, and a fabrication method thereof. The chip light emitting diode has a resin package sealing a light emitting chip which has at least one curved projecting part. The curved projecting part has a cross section which is substantially semicircular, or substantially or partially elliptical or parabolic. The curved projecting part preferably has a cross section which is comprised of a plurality of straight lines, an angle being formed between adjacent lines. The cross section is elongated to form a cylindrical outer surface of the resin package.