Electro-phoretic display apparatus and driving method thereof
A driving method for an electro-phoretic display apparatus is disclosed. The method includes generating a common voltage by a common voltage generator held at a first voltage level before a polarity transfer, generating the common voltage held at a second voltage level when the polarity transfer starts during a first timing period, and generating the common voltage transfers held at a third voltage level during a second timing period after the first timing period, in which the second voltage level is between the first and the third voltageE levels.
1. A driving method for an electro-phoretic display apparatus, wherein a plurality of pixel units of the electro-phoretic display apparatus collectively receive an alternating current (AC) common voltage, and each of the pixel units receives a pixel data signal, the driving method comprising:
providing a common voltage generator for generating the common voltage held at a first voltage level directly before a polarity transfer;
providing the common voltage generator for generating the common voltage held at a second voltage level when the polarity transfer starts during a first timing period;
providing the common voltage generator for generating the common voltage held at a third voltage level during a second timing period directly after the first timing period, so as to complete the polarity transfer, wherein the second voltage level is between the first voltage level and the third voltage level;
providing a source driver for generating the pixel data signals, the source driver generating each of the pixel data signals of an original voltage level before the polarity transfer;
generating each of the pixel data signals held at a middle voltage level during the first timing period, wherein each of the pixel data signals is held at the middle voltage level during the entire first timing period; and
generating each of the pixel data signals held at a post-transition voltage level during the second timing period, so as to complete the polarity transfer, wherein the middle voltage level is between the original voltage level and the post-transition voltage level, and each of the pixel data signals is held at the post-transition voltage level during the entire second timing period,
wherein before the polarity transfer, if the common voltage is less than the second voltage level, then the pixel data signals are less than the middle voltage level,
wherein during the second timing period, if the common voltage is higher than the second voltage level, then the pixel data signals are higher than the middle voltage level.
2. The driving method as claimed in claim 1 , wherein the first voltage level is higher than the third voltage level, or the third voltage level is higher than the first voltage level, wherein the post-transition voltage level is higher than the original voltage level when the third voltage level is higher than the first voltage level, and the post-transition voltage level is less than the original voltage level when the third voltage level is less than the first voltage level,
wherein a transition of the common voltage is synchronous with that of the pixel data signals.
3. An electro-phoretic display apparatus, comprising:
a plurality of pixel units collectively receiving an AC common voltage, and each of the pixel units receives a pixel data signal;
a common voltage generator coupled to the pixel units for generating the common voltage held at a first voltage level directly before a polarity transfer, generating the common voltage held at a second voltage level when the polarity transfer starts during a first timing period, and generating the common voltage held at a third voltage level during a second timing period directly after the first timing period, so as to complete the polarity transfer, wherein the second voltage level is between the first voltage level and the third voltage level; and
a source driver coupled to the pixel units for generating the pixel data signals, wherein the source driver generates each of the pixel data signals of an original voltage level before the polarity transfer, generates each of the pixel data signals held at a middle voltage level during the first timing period, and generates each of the pixel data signals held at a post-transition voltage level during the second timing period, so as to complete the polarity transfer, wherein the middle voltage level is between the original voltage level and the post-transition voltage level,
wherein each of the pixel data signals is held at the middle voltage level during the entire first timing period,
wherein each of the pixel data signals is held at the post-transition voltage level during the entire second timing period,
wherein before the polarity transfer, if the common voltage is less than the second voltage level, then the pixel data signals are less than the middle voltage level,
wherein during the second timing period, if the common voltage is higher than the second voltage level, then the pixel data signals are higher than the middle voltage level.
4. The electro-phoretic display apparatus as claimed in claim 3 , wherein the first voltage level is higher than the third voltage level, or the third voltage level is higher than the first voltage level, wherein the post-transition voltage level is higher than the original voltage level when the third voltage level is higher than the first voltage level, and the post-transition voltage level is less than the original voltage level when the third voltage level is less than the first voltage level,
wherein a transition of the common voltage is synchronous with that of the pixel data signals.