Electro-optical device, method of driving electro-optical device, and electronic apparatus

• US 20060192745A1
• Filed: 02/07/2006
• Published: 08/31/2006
• Est. Priority Date: 02/28/2005
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sanyo Epson Imaging Devices Corporation (Seiko Group)
• Inventors: Yamazaki, Katsunori
• Granted Patent: US 7,847,775 B2
• Time in Patent Office: Days
• US Class Current: 345/100
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 2203/30 Gray scale
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

An electro-optical device includes pixels that are provided to correspond to intersections of a plurality of rows of scanning lines and a plurality of columns of first data lines, each pixel having an pixel electrode, a common electrode that faces the pixel electrode, a first transistor that is turned on when a corresponding scanning line is selected to supply a data signal from a first data line to the pixel electrode, and a second transistor that is turned on when another scanning line than the corresponding scanning line is selected prior to the corresponding scanning line to supply a data signal from the first data line or a data line different from the first data line to the pixel electrode, a scanning line driving circuit that selects the plurality of rows of scanning lines according to a predetermined sequence, when one scanning line is selected, applies a first voltage so as to turn on the first or second transistor, when the selection ends, applies a second voltage so as to turn off the first and second transistors, and, when a scanning line next to the scanning line is selected, applies a third voltage between the first voltage and the second voltage so as to turn off the first and second transistors, and a data line driving circuit that supplies a data signal according to a grayscale level of a pixel of the selected scanning line through the first data line.

Claims

1. An electro-optical device comprising:

pixels that are provided to correspond to intersections of a plurality of rows of scanning lines and a plurality of columns of first data lines, each pixel having;

an pixel electrode;

a common electrode that faces the pixel electrode;

a first transistor that is turned on when a corresponding scanning line is selected to supply a data signal from the first data line to the pixel electrode; and

a second transistor that is turned on when another scanning line than the corresponding scanning line is selected prior to the corresponding scanning line to supply a data signal from the first data line or a data line different from the first data line to the pixel electrode;

a scanning line driving circuit that selects the plurality of rows of scanning lines according to a predetermined sequence, when one scanning line is selected, applies a first voltage so as to turn on the first or second transistor, when the selection ends, applies a second voltage so as to turn off the first and second transistors, and, when a scanning line next to the scanning line is selected, applies a third voltage between the first voltage and the second voltage so as to turn off the first and second transistors; and

a data line driving circuit that supplies a data signal according to a grayscale level of a pixel of the selected scanning line through the first data line.

2. The electro-optical device according to claim 1,

wherein the data line driving circuit divides the voltage of the data signal into a high-level positive voltage and a low-level negative voltage on the basis of a predetermined potential for each predetermined period so as to alternately supply the high-level positive voltage and the low-level positive voltage, and causes the voltage of the data signal when the first transistor is turned on and the voltage of the data signal when the second transistor is turned on to have the same polarity.

3. The electro-optical device according to claim 1,

wherein the pixel electrode and the common electrode are formed on the same substrate.

4. The electro-optical device according to claim 1, further comprising:

a first storage capacitor that capacitively couples the corresponding scanning line and the pixel electrode; and

a second storage capacitor that capacitively couples another scanning line and the pixel electrode.

5. The electro-optical device according to claim 4,

wherein the first storage capacitor has a laminated structure of the corresponding scanning line, an insulator, and the pixel electrode, and

the second storage capacitor has a laminated structure of another scanning line, an insulator, and the pixel electrode.

6. The electro-optical device according to claim 1, further comprising:

second data lines that pair up with the first data lines,

wherein the data line driving circuit inverts the data signal to be supplied to the first data line on the basis of a predetermined potential and supplies it to the second data line as an inverted data signal, and

when the second transistor is turned on, the inverted data signal is supplied from the second data line to the pixel electrode.

7. The electro-optical device according to claim 6,

wherein the data line driving circuit divides the voltage of the data signal into a high-level positive voltage and a low-level negative voltage on the basis of the predetermined potential for each predetermined period so as to alternately supply the high-level positive voltage and the low-level positive voltage, and causes the voltage of the data signal when the first transistor is turned on and the voltage of the inverted data signal when the second transistor is turned on to have the same polarity.

8. The electro-optical device according to claim 6, further comprising:

a first storage capacitor that capacitively couples the first data line and the pixel electrode; and

a second storage capacitor that capacitively couples the second data line and the pixel electrode.

9. The electro-optical device according to claim 8,

wherein the first storage capacitor has a laminated structure of the first data line, an insulating layer, and the pixel electrode, and

the second storage capacitor has a laminated structure of the second data line, an insulating layer, and the pixel electrode.

11. An electronic apparatus comprising the electro-optical device according to claim 1.

10. A method of driving an electro-optical device, which has pixels that are provided to correspond to intersections of a plurality of rows of scanning lines and a plurality of columns of first data lines, each pixel having an pixel electrode, a common electrode that faces the pixel electrode, a first transistor that is turned on when a corresponding scanning line is selected to supply a data signal from the first data line to the pixel electrode, and a second transistor that is turned on when another scanning line than the corresponding scanning line is selected prior to the corresponding scanning line to supply a data signal from the first data line or a data line different from the first data line to the pixel electrode, the method of driving an electro-optical device comprising:

selecting the plurality of rows of scanning lines according to a predetermined sequence;

when one scanning line is selected, applying a first voltage so as to turn on the first or second transistor, when the selection ends, applying a second voltage so as to turn off the first and second transistors, and, when a scanning line next to the scanning line is selected, applying a third voltage between the first voltage and the second voltage so as to turn off the first and second transistors; and

supplying a data signal according to a grayscale level of a pixel of the selected scanning line through the first data line.