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US 7,030,851 B2Granted
Electrooptical device, driving circuit for driving the electrooptical device, driving method for driving the electrooptical device, and electronic equipment
AssigneeSeiko Epson Corporation
InventorKatsunori Yamazaki
Life of this patent
Estimating the term…
Abstract
The invention enhances image quality of a moving image when an electrooptical device presents the image based on an electrooptical change in an electrooptical material. Pixels, which are turned on within one horizontal scanning period, are only provided in four rows, while the four rows are successively shifted downward every horizontal scanning period. In this way, the pixels are turned off within a short period of time, thereby reducing a chance of an image being recognized as an after image.
Claims15
A driving circuit of an electrooptical device to drive a pixel arranged at an intersection of a scanning line of multiple scanning lines and a data line of multiple data lines, comprising:
- a scanning line driving circuit which drives a first shift register and a second shift register, the first shift register including an OR gate provided at an output of the first shift register in a one-to-one correspondence with a scanning line, the OR gate of the first shift register outputting an OR signal that is obtained by combining a corresponding transfer signal and an inverted version of a control signal that is controlled by a write period of a signal representing a display content of the pixel and a write period of a signal for forcefully causing the pixel to be in a turning-off state, the second shift register including an OR gate provided at an output of the second shift register in a one-to-one correspondence with a scanning line, the OR gate of the second shift register outputting an OR signal that is obtained by combining the corresponding transfer signal and the control signal, the first shift register latching a first pulse signal, the second shift register latching a second pulse signal that is delayed from the first pulse signal, the scanning line driving circuit selecting a scanning line, supplying a scanning signal that combines an output of the first shift register and an output of the second shift register to the selected scanning line, and applying a first selection voltage to the selected scanning line, the scanning line driving circuit selecting the selected scanning line again after selecting at least one other scanning line, and applying a second selection voltage to the selected scanning line;
- and
- a data line driving circuit which supplies a data line with a signal that corresponds to the display content of the pixel at the intersection of the scanning line and the data line when the scanning line is supplied with the first selection voltage, and which supplies the data line with a turning-off signal in accordance with the inverted version of the control signal, the turning-off signal causing the pixel to be placed in a turned-off state regardless of the display content of the pixel when the scanning line is supplied with the second selection voltage.
A driving method of an electrooptical device to drive a pixel arranged at an intersection of a scanning line of multiple scanning lines and a data line of multiple data lines, comprising:
- latching a first pulse signal at a first shift register, the first shift register including an OR gate provided at an output of the first shift register in a one-to-one correspondence with a scanning line, the OR gate of the first shift register outputting an OR signal that is obtained by combining a corresponding transfer signal and an inverted version of a control signal that is controlled by a write period of a signal representing a display content of the pixel and a write period of a signal for forcefully causing the pixel to be in a turning-off state;
- latching a second pulse signal at a second shift register, the second pulse signal being delayed from the first pulse signal, the second shift register including an OR gate provided at an output of the second shift register in a one-to-one correspondence with a scanning line, the OR gate of the second shift register outputting an OR signal that is obtained by combining the corresponding transfer signal and the control signal;
- selecting a scanning line;
- supplying a scanning signal that combines an output of the first shift register and an output of the second shift register to the selected scanning line;
- supplying a first selection voltage to the selected scanning line;
- selecting the scanning line again after selecting at least one other scanning line;
- supplying a second selection voltage to the selected scanning line;
- supplying a data line with a signal that corresponds to a display content of the pixel at the intersection of the scanning line and the data line when the scanning line is supplied with the first selection voltage;
- and
- supplying the data line with a turning-off signal in accordance with the inverted version of the control signal, the turning-off signal causing the pixel to be placed in a turned-off state regardless of the display content of the pixel when the scanning line is supplied with the second selection voltage.
7 more elements
An electrooptical device having a pixel arranged at an intersection of a scanning line of multiple scanning lines and a data line of multiple data lines, comprising:
- a scanning line driving circuit which drives a first shift register and a second shift register, the first shift register including an OR gate provided at an output of the first shift register in a one-to-one correspondence with a scanning line, the OR gate of the first shift register outputting an OR signal that is obtained by combining a corresponding transfer signal and an inverted version of a control signal that is controlled by a write period of a signal representing a display content of the pixel and a write period of a signal for forcefully causing the pixel to be in a turning-off state, the second shift register including an OR gate provided at an output of the second shift register in a one-to-one correspondence with a scanning line, the OR gate of the second shift register outputting an OR signal that is obtained by combining the corresponding transfer signal and the control signal, the first shift register latching a first pulse signal, the second shift register latching a second pulse signal that is delayed from the first pulse signal, the scanning line driving circuit selecting a scanning line, supplying a scanning signal that combines an output of the first shift register and an output of the second shift register to the selected scanning line, and applying a first selection voltage to the selected scanning line, the scanning line driving circuit selecting the selected scanning line again after selecting at least one other scanning line, and applying a second selection voltage to the selected scanning line;
- and
- a data line driving circuit which supplies a data line with a signal that corresponds to a display content of the pixel at the intersection of the scanning line and the data line when the scanning line is supplied with the first selection voltage, and which supplies the data line with a turning-off signal in accordance with the inverted version of the control signal, the turning-off signal causing the pixel to be placed in a turned-off state regardless of the display content of the pixel when the scanning line is supplied with the second selection voltage.
Dependencies are inferred from the claim text.