1. Field
One or more embodiments disclosed herein relate to a scan driving circuit and a driving method for the scan driving circuit.
2. Description of the Related Art
Personal computers, portable phones, portable information terminals, and monitors of various information devices are all equipped with displays. The display may be, for example, a liquid crystal display, an organic light emitting diode display, or a plasma display panel. An organic light emitting diode display in particular has excellent emission efficiency, luminance, viewing angle, and response time.
An organic light emitting diode display generates images using pixels that include organic light emitting diodes. The pixels are arranged in a matrix at cross points of data lines, scan lines, and power supply lines. In addition to an organic light emitting diode, each pixel includes a driving transistor and one or more capacitors. Light is emitted from the diode based on a recombination of electrons and holes in a light emitting active layer.
Over time, the amount of current flowing in the organic light emitting diode of each pixel may change based on a deviation in the threshold voltage of the driving transistor. As a result, non-uniformity may occur in the display. Additionally, the characteristics of the driving transistor may change based on manufacturing process parameters. Because it is difficult for the transistors in an organic light emitting diode display to have the same characteristics, the threshold voltage deviation of the driving transistors in the pixels may be different.
In attempt to overcome this deviation, a compensation circuit may be used in each pixel. The compensation circuit may charge a voltage corresponding to the threshold voltage of the driving transistor for 1 horizontal period. However, in some displays and especially in a high-resolution organic light emitting diode display, coupling may occur in a parasitic capacitor between lines and horizontal striped patterns. This may adversely affect display performance.