Patent ID: 8619099

Claim:
A display device, comprising: a display panel for displaying images; an orientation recognition unit configured for determining an angle of rotation of the display panel and generating a corresponding direction detection signal, comprising: a housing defining an orbit; an optical emitter; a main body comprising a first concave structure with a first recess; an upper cover comprising a second concave structure with a second recess, wherein the main body is connected to the upper cover such that the optical emitter is received in the first and second recesses, and the orbit thereby cooperatively defined by the first and second concave structures; a ball bearing movably received in the orbit; four optical receivers; four receiving grooves defined at four inside walls of the orientation recognition unit respectively, with the four optical receivers received in the four receiving grooves respectively; at least one through hole corresponding to the four optical receivers, wherein the at least one through hole communicates with the orbit; and a plurality of bumps distributed on a peripheral surface of the orbit corresponding to the at least one through hole; wherein when the display panel is rotated to a predetermined angle, the ball bearing moves under the effect of gravity to stop on at least one through hole where the ball bearing blocks transmission of light between the optical emitter and a first optical receiver of the four optical receivers, the orientation recognition unit generates a corresponding direction detection signal; and the bumps are positioned to quickly baffle the ball bearing to the position where the ball bearing blocks the transmission of light between the optical emitter and the first receiver; and a directional detection circuit configured for adjusting an orientation of one or more images displayed by the display panel according to the direction detection signal.