Electro-optical device and electronic apparatus

• US 8,872,989 B2
• Filed: 09/04/2012
• Issued: 10/28/2014
• Est. Priority Date: 09/20/2011
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Tokumura, Toshiaki, Ito, Akihiko
• Primary Examiner(s): Snyder, Adam J
• Assistant Examiner(s): RABINDRANATH, ROY P
• Application Number:
  US13/602,743
• Publication Number:
  US 20130070005A1
• Time in Patent Office: 784 Days
• Field of Search: 349/15
• US Class Current: 349/15
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A driving circuit applies a voltage according to an assigned grayscale during each unit period of each display period, in such a manner that the applied voltage to a liquid crystal element during one of the unit periods and the applied voltage to the liquid crystal element during the other of the unit periods are opposite in polarity during each of the display periods, and an overdrive control unit enables the drive circuit to perform overdrive of a compensation grayscale according to a display image during the corresponding display period and to a display image during the immediately preceding display period during each of the first and second unit periods of each of the display periods, during each of the display periods.

Claims

1. An electro-optical device alternately displaying right-eye and left-eye images each of display periods, comprising:

a plurality of pixels arranged corresponding to intersections between a plurality of scan lines and a plurality of signal lines;

a drive circuit applying a voltage according to an assigned grayscale to each of the pixels during each of first and second unit periods of each of display periods in such a manner that the applied voltages to each of the pixels during the first and second unit periods of each of the display periods, respectively, are opposite in polarity, and the drive circuit sequentially selects each of the scan lines and applies the voltage according to the assigned grayscale to each of the pixels corresponding to the scan line in a selection state; and

an overdrive control unit enabling the drive circuit to perform overdrive of a compensation grayscale according to a display image during a corresponding display period and to a display image during the immediately preceding display period during each of the first and second unit periods of each of the display periods, during each of the display periods, and the overdrive control unit controlling the overdrive on each of the pixels by the drive circuit in such a manner that, in a case where the assigned grayscale in the display image during one display period and the assigned grayscale in the display image during the display period immediately preceding the one display period are equal to each other, in the pixels corresponding to the first scan line, and the pixels corresponding to the second scan lines selected after the selection of the first scan line among the plurality of scan lines, an amount of overdrive compensation on the pixel corresponding to the second scan line exceeds the amount of overdrive compensation on the pixel corresponding to the first scan line, during one of the display periods.

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

a memory unit storing a plurality of adjustment values corresponding to respective positions in the arrangement direction of the plurality of scan lines; and

an interpolation unit generating an adjustment value corresponding to each of the scan lines by interpolating the plurality of adjustment values that the memory unit stores,

wherein the overdrive control unit adjusts the amount of overdrive compensation on the pixels corresponding to each of the scan lines, according to each of the adjustment values generated by the interpolation unit.

3. The electro-optical device according to claim 1, wherein the overdrive control unit controls the overdrive on each of the pixels by the drive circuit, in such a manner that the amount of overdrive compensation on each of the pixels in the first unit period of each of the display periods exceeds the amount of overdrive compensation on the corresponding pixels during the second unit period following the first unit period of the corresponding display period.

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