Abstract: A variable displacement swash plate type compressor which smoothly supplies oil contained in a refrigerant inside a crank-case to a drive shaft seal region of a front housing, and thus the frictional heat temperature between the drive shaft and a sealing member can be reduced, leakage of refrigerant and pressure is prevented, and durability can be improved.

Abstract: A swash plate compressor including: a housing; a rotating shaft rotatably mounted to the housing; a swash plate accommodated in a crank chamber of the housing and rotating with the rotating shaft; a piston forming a compression chamber with the housing and interlocking with the swash plate to reciprocate; a discharge flow path guiding a refrigerant of the crank chamber to a suction chamber of the housing wherein an inclination angle of the swash plate is adjusted; and a discharge flow path control valve having a valve chamber provided in the discharge flow path and a valve core reciprocating inside the valve chamber, and the valve core includes: a first communication path constantly communicating the discharge flow path; and a second communication path communicating the discharge flow path when differential pressure between pressure of the crank chamber and pressure of the suction chamber is within a certain pressure range.

Abstract: A method and apparatus for driving a plasma display panel that is adaptive for improving a capability of gray scale expression as well as a picture quality. In the method and apparatus, an average brightness of an image is detected. A gray level number of the current image is adjusted in accordance with said average brightness of said image using a pre-stored reference gray level number.

Abstract: There is disclosed a method and apparatus of driving a plasma display panel that is adaptive for expressing linear gray levels by way of preventing a gray level inversion. A driving method of a plasma display panel according to an embodiment of the present invention includes allocating a first brightness weight to the sub-fields; and setting a second brightness weight by way of subtracting the amount of light generated during the address period from the first brightness weight.

Abstract: An optimal light-emission pattern generation method for a plasma display panel according to an embodiment of the present invention includes steps of determining a plurality of light-emission patterns with respect to an arbitrary gray level; calculating a contour noise degree between a contour noise free gray level being set in advance and the light-emission patterns given to each gray level in plurality; and selecting a light-emission pattern whose contour noise degree is minimal as a light-emission pattern with respect to an arbitrary gray level.

Abstract: There is disclosed a method and apparatus of driving a plasma display panel that is adaptive for expressing linear gray levels by way of preventing a gray level inversion.

Abstract: A method and apparatus for driving a plasma display panel that is adaptive for improving a capability of gray scale expression as well as a picture quality. In the method and apparatus, an average brightness of an image is detected. A gray level number of the current image is adjusted in accordance with said average brightness of said image using a pre-stored reference gray level number.

Abstract: This invention relates to a driving method and apparatus for a plasma display panel, and more particularly to a method of generating an optimal light-emission pattern for a plasma display panel in order to select a light-emission pattern where a moving picture pseudo contour noise is minimized.