Abstract: A display device includes a plurality of pixels and a control circuit configured to control brightness of the plurality of pixels. Each of the plurality of pixels includes a light-emitting element and a pixel circuit configured to control light emission of the light-emitting element. The pixel circuit includes a driving transistor configured to supply electric current to the light-emitting element, and a storage capacitor configured to store voltage to control the electric current to be supplied by the driving transistor to the light-emitting element. The control circuit is configured to determine a statistic of brightness of pixels specified by one or more video frames with a predetermined method, determine a length of a threshold compensation period for which the storage capacitor applies threshold compensation to the driving transistor based on the statistic, and control the pixel circuit based on the threshold compensation period.

Abstract: A display device includes a plurality of pixels and a control circuit configured to control brightness of the plurality of pixels. Each of the plurality of pixels includes a light-emitting element and a pixel circuit configured to control light emission of the light-emitting element. The pixel circuit includes a driving transistor configured to supply electric current to the light-emitting element, and a storage capacitor configured to store voltage to control the electric current to be supplied by the driving transistor to the light-emitting element. The control circuit is configured to determine a statistic of brightness of pixels specified by one or more video frames with a predetermined method, determine a length of a threshold compensation period for which the storage capacitor applies threshold compensation to the driving transistor based on the statistic, and control the pixel circuit based on the threshold compensation period.

Abstract: A device for the efficient parking of vehicles is provided. The device includes: 1) a car-pan comprised of steel plate; 2) strengthening rods on the car-pan; 3) a parking space frame comprising a pair of steel C bars as its side beams and another pair of steel C bars as its end beams; 4) a number of (preferably two set) of free rollers with supports; 5) two pairs of driving rollers; 6) a parking power/control box affixed between the two side beams of the parking space; 7) chains connecting the driving rollers with the parking power/control box; 8) an elevator; 9) vertical rack-rails located at the two sides of the elevator; 10) an elevator power/control box affixed between the two side beams of the elevator; and 11) two pairs of chains connecting the driving rollers and the climbing gears of the elevator power/control box. The present device may further include 12) four cables with connectors, and 13) two balance weights between the vertical rack-rails.