Electrowetting display driving system
A display driving system for an electrowetting display device having at least one display element, the display driving system comprising a driver stage for the display element, the driver stage providing a display voltage to be applied to the display element in response to a data signal representing an image to be displayed, the driver stage including a variable source providing a variable voltage in dependence on the data signal, the display driving system including an offset source providing an offset voltage, the display voltage being the sum of the offset voltage and the variable voltage.
1. A display driving system for an electrowetting display device having a display element, the display driving system comprising a driver stage for the display element, the driver stage configured to provide a display voltage to be applied to the display element in response to a data signal representing an image to be displayed,
the driver stage including a variable source configured to provide a variable voltage in dependence on the data signal,
the display driving system including an offset source configured to provide an offset voltage,
the display voltage being the sum of the offset voltage and the variable voltage.
2. A display driving system according to claim 1 , wherein the offset voltage corresponds to a threshold voltage of the display element.
3. A display driving system according to claim 1 , wherein the offset voltage is adjustable.
4. A display driving system according to claim 1 , wherein the variable source has an adjustable voltage swing.
5. A display driving system according to claim 1 , wherein the electrowetting display device includes a plurality of display elements including the display element and having a common electrode, and each display element of the plurality of display elements having an element electrode, the display voltage of the display element being appliable between the common electrode and the element electrode of the display element, and
an output of the offset source being connected to the common electrode.
6. A display apparatus including an electrowetting display device having a display element and a display driving system comprising a driver stage for the display element, the driver stage configured to provide a display voltage to be applied to the display element in response to a data signal representing an image to be displayed,
the driver stage including a variable source configured to provide a variable voltage in dependence on the data signal,
the display driving system including an offset source configured to provide an offset voltage,
the display voltage being the sum of the offset voltage and the variable voltage.
7. A display apparatus according to claim 6 , wherein the offset voltage corresponds to a threshold voltage of the display element.
8. A display apparatus according to claim 6 , wherein the offset voltage is adjustable.
9. A display apparatus according to claim 6 , wherein the variable source has an adjustable voltage swing.
10. A display apparatus according to claim 6 , wherein the electrowetting display device includes a plurality of display elements including the display element and having a common electrode, and each display element of the plurality of display elements having an element electrode, the display voltage of the display element being appliable between the common electrode and the element electrode of the display element, and
an output of the offset source being connected to the common electrode.
11. A method of driving an electrowetting display device having a display element, the display element configured to provide a display state in response to a display voltage, the method including forming the display voltage by adding an offset voltage from an offset source and a variable voltage from a variable source, the variable voltage depending on a data signal representing an image to be displayed.
12. A method according to claim 11 , wherein the offset voltage corresponds to a threshold voltage of the display element.
13. A method according to claim 11 , wherein the offset voltage is adjustable.
14. A method according to claim 11 , wherein the variable voltage has an adjustable voltage swing.
15. A method according to claim 11 , wherein the electrowetting display device includes a plurality of display elements including the display element and having a common electrode, and each display element of the plurality of display elements having an element electrode, the display voltage of the display element being applied between the common electrode and the element electrode of the display element, and the offset voltage being applied to the common electrode.
16. A display driving system according to claim 1 , wherein the offset voltage is adjustable in dependence on a content of the image to be displayed.
17. A display driving system according to claim 1 , wherein the display element comprises a first fluid and a second fluid immiscible with the first fluid, wherein the offset source is configured to provide the offset voltage with a magnitude such that, with the offset voltage applied to the display element, the first fluid and the second fluid adjoin a support plate of the electrowetting display device.
18. A display driving system according to claim 17 configured to, at all times during addressing of the display element, apply the offset voltage to the display element.
19. A display apparatus according to claim 6 , wherein the display element comprises a first fluid and a second fluid immiscible with the first fluid, wherein the offset source is configured to provide the offset voltage with a magnitude such that, with the offset voltage applied to the display element, the first fluid and the second fluid adjoin a support plate of the electrowetting display device.
20. A display apparatus according to claim 19 , wherein the display driving system is configured to, at all times during addressing of the display element, apply the offset voltage to the display element.