Display device and method of driving the same

摘要

According to one embodiment, a display device includes a first substrate, a second substrate, a first electrode, a second electrode, a partition electrode, a luminescent layer and a voltage source. The luminescent layer includes a luminescent material emitting light rays due to an electrochemical oxidation or reduction reaction thereof. The voltage source is configured to generate a driving voltage between the first and second electrodes so as to apply first and second potentials, wherein the first and second potentials are maintained at one and opposite polarities in respect to the reference potential during a predetermined segment period respectively and are periodically reversed, each of the first and second potentials is changed first to second absolute levels during the predetermined segment period, the second absolute potential is determined depending on the gradation of input image data, and the first absolute potential is higher than the second absolute potential.

主权项

1. An electrochemical luminescence display device for displaying an image having a gradation depending on input image data, comprising:
a first substrate; a first electrode and a second electrode arranged on the first substrate apart from each other; a second substrate arranged opposite to the first substrate; a partition electrode arranged between the first and second substrates to define a space between the first and second substrates, wherein the partition electrode is not involved in the electrochemical reactions and is maintained to have a constant reference potential to ground, and wherein the reference potential is a potential between a potential of the first electrode and a potential of the second electrode; a luminescent layer which is provided in the space and includes a luminescent material, wherein the luminescent layer emits light rays due to an electrochemical oxidation or reduction reaction of the luminescent material; and a voltage source configured to generate pseudo-direct-current voltage between the first and second electrodes so as to apply a first potential to the first electrode and a second potential to the second electrode, wherein the first and second potentials are maintained at one and opposite polarities in respect to the reference potential, each of the first and second potentials is periodically reversed in polarity, is changed from a first to a second level during a period when the polarity is positive, and is changed from a third level to a fourth level during a period when the polarity is negative, the second level and the fourth level are determined depending on the gradation of image data, the first level is higher than the second level to obtain desired luminance, and the third level is lower than the fourth level to obtain desired luminance.