Abstract: A display device includes a plurality of pixels arranged in a display area of a display panel, and a display driving circuit supplying data voltages and pixel driving control signals to the plurality of pixels to control an image display operation for each of the plurality of pixels. The display driving circuit further supplies an active control voltage that varies proportional to or inversely proportional to a change in temperature of the display panel to at least one thin film transistor included in the plurality of pixels.

Abstract: A rotation speed detecting apparatus for a motor includes a motor; an encoder section, attached to the motor, for producing at least two encoder pulse signals each 90 degrees out of phase from the other; a control and division number setting section for controlling the rotation direction and speed of the motor according to the loaded program, setting a division number and producing a division control signal according to the set division number; a quadrupled pulse signal producing section for producing an up/down pulse signal according to the forward and reverse rotation directions of the motor on a quadrupled pulse signal and an up/down pulse signal produced according to the state transitions in the encoder pulse signals; and, a frequency dividing section for counting up or down the quadrupled pulse signal and dividing the quadrupled pulse signal by the set division number.