Abstract: An image display method for a portable display device to be implemented by a processing module includes: controlling the portable display device to display an image in a default position within a display area; estimating a displacement distance of the portable display device during an (X+1)th unit time period, based at least on a number (N) of displacement distances of the portable display device respectively during (N) number of immediately previous unit time periods or on accelerations of the portable display device respectively associated with (X?1)th and (X)th unit time periods; and controlling the portable display device to shift the image with respect to the display area based on the displacement distance estimated thereby.

Abstract: An image display method for a portable display device to be implemented by a processing module includes: controlling the portable display device to display an image in a default position within a display area; estimating a displacement distance of the portable display device during an (X+1)th unit time period, based at least on a number (N) of displacement distances of the portable display device respectively during (N) number of immediately previous unit time periods or on accelerations of the portable display device respectively associated with (X?1)th and (X)th unit time periods; and controlling the portable display device to shift the image with respect to the display area based on the displacement distance estimated thereby.

Abstract: The driving and dimming control device for illuminator includes an AC power input end connecting to a phase dimmer, a DC power output end for connecting to a lighting load, a rectifier connecting to the AC power input end, a pulse width modulator connecting to a transformer, a voltage/current detector, a photo-coupler connecting between the voltage/current detector and pulse width modulator, and a low-voltage-input locking circuit connecting between an output terminal of the phase dimmer and pulse width modulator. The low-voltage-input locking circuit includes a locking switch and a reset switch. The signals input to the pulse width modulator are locked by the locking switch to prohibit the pulse width modulator from hiccupping. Thus the DC output power can be stabilized.