Patent ID: 9224335
Filing Date: 2015-12-29
Classification: G09G

Abstract:
1. An organic light emitting diode display device comprising: a plurality of pixels each comprising a light emitting element, and a pixel driving circuit for driving the light emitting element, wherein the pixel driving circuit comprises: a driving switching element connected in series between a high-level voltage supply line and a low-level voltage supply line, together with the light emitting element, a first switching element for connecting a data line and a first node connected to a gate of the driving switching element in response to a first scan signal, a second switching element for connecting an initialization voltage supply line and a second node connected to a source of the driving switching element in response to a second scan signal, a third switching element for connecting the high-level voltage supply line and a drain of the driving switching element in response to an emission signal, and a first capacitor connected between the first node and the second node, wherein the pixel driving circuit operates in a period divided into an initialization period in which the pixel driving circuit turns on the first and second switching elements, to initialize the first and second nodes, a sampling period in which the pixel driving circuit turns on the first and third switching elements, to sense a threshold voltage of the driving switching element, a programming period in which the pixel driving circuit turns on the first switching element, to write a data voltage into the pixel, and an emission period in which the pixel driving circuit turns on the third switching element, to cause the driving switching element to supply drive current to the light emitting element, and wherein: the pixels operate on a per column basis, and each operation period of the pixels is divided into a first horizontal period and a second horizontal period subsequent to the first horizontal period; each of the pixels in a current pixel column has the initialization period in the first horizontal period thereof, the initialization period of the pixel in the current pixel column corresponding to the sampling period of each of the pixels in a previous pixel column; and each of the pixels in the current pixel column has the sampling period and the programming period in the second horizontal period thereof.