Patent ID: 11935456
Assignee: LX SEMICON CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. A pixel circuit comprising:
a first path circuit comprising a first transistor for controlling the supply of a high driving voltage to a first node and a second transistor for controlling the supply of a low driving voltage to the first node; and
a second path circuit comprising a third transistor for controlling the supply of the high driving voltage to an anode of a first LED, a fourth transistor arranged between the first LED and the third transistor, a fifth transistor for controlling the supply of the high driving voltage to an anode of a second LED arranged in parallel with the first LED, a sixth transistor arranged between the second LED and the fifth transistor, and a seventh transistor for controlling the supply of the low driving voltage to cathodes of the first LED and the second LED, wherein gates of the third transistor and the fourth transistor are electrically connected to the first node and only either the fourth transistor or the sixth transistor is selected,
wherein, once the high driving voltage is formed at the first node, the third transistor and the fifth transistor turn on, and, when only either the fourth transistor or the sixth transistor is selected to supply the low driving voltage to the cathode of one of the first and second LEDs while the third transistor and the fifth transistor are on, either the first LED or the second LED emits light, and
wherein a ramp voltage which increases or decreases with time is supplied to a gate of the second transistor and a starting value of the ramp voltage is determined based on a grayscale value of a pixel.