ELECTRIC OPTICAL APPARATUS, DRIVING METHOD THEREOF AND ELECTRONIC DEVICE

• US 20140198094A1
• Filed: 03/14/2014
• Published: 07/17/2014
• Est. Priority Date: 01/12/2010
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: YAMAZAKI, Katsunori
• Granted Patent: US 9,418,602 B2
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167
• CPC Class Codes: G09G 3/3446 with more than two electrodes controlling the modulating element
• CPC Class Codes: G09G 5/00 Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators image data processing or generation, in general G06T

Abstract

An electric optical apparatus including a display section in which an electric optical material is pinched between a pair of substrates and a plurality of pixels is arranged, wherein the display section is provided with a scanning line, a data line and a power-supply line that are connected to each of the pixels, and each of the pixels is provided with a pixel electrode, a driving transistor that is connected between the pixel electrode and the power-supply line, a capacitance for modulation that is connected between a gate of the driving transistor and the data line, a maintenance capacitance that connects one side electrode to the gate of the driving transistor, and a transistor for correction that is connected to a diode and in which one side terminal thereof is connected to the gate of the driving transistor.

Claims

1. An electric optical apparatus comprising:

a pair of substrates;

an electric optical material that is provided in a display section between the pair of substrates; and

a first pixel and a second pixel that are arranged in the display section, the first pixel includes;

a first scanning line;

a data line;

a power line;

a pixel electrode;

a driving transistor that has a gate, a first terminal and a second terminal, the gate of the driving transistor being connected to a first node, the first terminal being connected to the power line, the second terminal being connected to the pixel electrode;

a modulation capacitor that has a first electrode and a second electrode, the first electrode being connected to the first node, the second electrode being connected to the data line;

a maintenance capacitor that has a third electrode and a fourth electrode, the third electrode being connected to the first node;

a correction transistor that has a gate, a third terminal and a fourth terminal, the gate of the correction transistor and the third terminal being connected to the first node;

a precharge transistor that has a gate, a fifth terminal and a sixth terminal, the gate of the precharge transistor being connected to the first scanning line, the fifth terminal being connected to the first node; and

a potential control line that is connected to the fourth electrode of the maintenance capacitor.

2. The electric optical apparatus according to claim 1, further comprising:

a controller, wherein

when an image is displayed on the display section, the controller is adapted to control;

a precharge operation unit that charges the maintenance capacitor in a state in which a reference potential is input to the power line and a first potential that is lower than the reference potential is input to the potential control line;

a correction program operation unit that inputs an image signal to the modulation capacitor via the data line, that draw a part of charges precharged in the maintenance capacitor via the correction transistor so as to set a gate voltage of the driving transistor as a threshold voltage, and that input a second potential that is different from the first potential to the potential control line; and

a display driving operation unit that inputs the reference potential to the potential control line, that inputs a third potential that is different from the reference potential to the power line, and that supplies a current to the pixel electrode via the driving transistor.

3. The electric optical apparatus according to claim 1, wherein

the sixth terminal of the precharge transistor is connected to the first scanning line.

4. The electric optical apparatus according to claim 3, further comprising:

a precharge power supply line that is connected to the sixth terminal of the precharge transistor.

5. The electric optical apparatus according to claim 1, further comprising:

a first control line that is arranged in a non-display section;

a second control line that is arranged in the non-display section; and

a potential control section that is arranged in the non-display section, the potential control section includes;

a first transistor that is connected between the first control line and the potential control line, a gate of the first transistor being connected to the first scanning line; and

a second transistor that is connected between the second control line and the potential control line, a gate of the second transistor being connected to a second node, wherein

the first transistor is in an ON state during a first period and is in an OFF state during a second period,

the second transistor is in the OFF state during the first period and is in the ON state during the second period,

a selection signal is input to the first scanning line during the first period and is not input to the first scanning line during the second period, and

the selection signal is not input to a second scanning line provided in the second pixel during the first period and is input to the second scanning line during the second period.

6. The electric optical apparatus according to claim 5, further comprising:

a third control line; and

a fourth control line, wherein

the potential control section further includes;

a third transistor that is connected between the third control line and the second node, a gate of the third transistor being connected to the first scanning line;

a fourth transistor that is connected between the fourth control line and the second node, a gate of the fourth transistor being connected to the second scanning line; and

a capacitor that is connected to the second node.

7. The electric optical apparatus according to claim 6, further comprising:

a fifth control line; and

a sixth control line, wherein

the potential control section further includes;

a fifth transistor that is connected between the sixth control line and the second node, a gate of the fifth transistor being connected to the fifth control line.

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

8. A driving method of an electric optical apparatus comprising:

the electric optical apparatus includes;

a pair of substrates;

an electric optical material that is provided in a display section between the pair of substrates; and

a first pixel and a second pixel that are arranged in the display section, the first pixel includes;

a scanning line;

a data line;

a power line;

a pixel electrode;

a driving transistor that has a gate, a first terminal and a second terminal, the gate of the driving transistor being connected to a first node, the first terminal being connected to the power line, the second terminal being connected to the pixel electrode;

a modulation capacitor that has a first electrode and a second electrode, the first electrode being connected to the first node, the second electrode being connected to the data line;

a maintenance capacitor that has a third electrode and a fourth electrode, the third electrode being connected to the first node;

a correction transistor that has a gate, a third terminal and a fourth terminal, the gate of the correction transistor and the third terminal being connected to the first node;

a precharge transistor that has a gate, a fifth terminal and a sixth terminal, the gate of the precharge transistor being connected to the scanning line, the fifth terminal being connected to the first node; and

a potential control line that is connected to the fourth electrode of the maintenance capacitor,

the driving method for displaying an image on the display section comprises;

precharging the maintenance capacitor in a state in which a reference potential is input to the power line and a first potential lower than the reference potential is input to the potential control line;

performing correction programming in which an image signal is inputs to the modulation capacitor via the data line, a part of charges precharged in the maintenance capacitor is drawn via the correction transistor so as to set a gate voltage of the driving transistor as a threshold voltage, and thereafter a second potential that is different from the first potential is input to the potential control line; and

performing display driving in which the reference potential is input to the potential control line, a third potential that is different from the reference potential is input to the power line, and a current is supplied to the pixel electrode via the driving transistor.

9. The driving method of the electric apparatus according to claim 8,

a third potential of the scanning line is input to the maintenance capacitor during the precharging.

10. The driving method of the electric apparatus according to claim 8,

a ramp waveform is input to the power line in the display driving.