ELECTRO-OPTIC DEVICE AND ELECTRONIC APPARATUS

• US 20110176080A1
• Filed: 01/12/2011
• Published: 07/21/2011
• Est. Priority Date: 01/19/2010
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: TOYOOKA, Takashi
• Granted Patent: US 8,531,369 B2
• Time in Patent Office: Days
• US Class Current: 349/41
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/2025 the sub-frames having all the same time duration
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3651 using multistable liquid crystals, e.g. ferroelectric liquid crystals
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables

Abstract

An electro-optic device including: a plurality of pixels disposed corresponding to a plurality of colors; and a drive circuit adapted to drive the pixels, wherein the drive circuit drives the pixels based on a drive voltage set for each of the colors in accordance with a mixture ratio between the colors, and a drive pattern provided in accordance with the drive voltage and adapted to designate one of switching ON and OFF of the pixels at each of sub-fields constituting a frame in accordance with a grayscale level, and the drive voltages are set so that a voltage range of the drive voltage is different between the pixel corresponding to at least one of the colors and the pixel corresponding to another of the colors, the colors having respective proportions of mixture different from each other.

Claims

1. An electro-optic device comprising:

a plurality of pixels disposed corresponding to a plurality of colors; and

a drive circuit adapted to drive the pixels,

wherein the drive circuit drives the pixels based on

a drive voltage set for each of the colors in accordance with a mixture ratio between the colors, and

a drive pattern provided in accordance with the drive voltage and adapted to designate one of switching ON and OFF of the pixels at each of sub-fields constituting a frame in accordance with a grayscale level, and

the drive voltages are set so that a voltage range of the drive voltage is different between the pixel corresponding to at least one of the colors and the pixel corresponding to another of the colors, the colors having respective proportions of mixture different from each other.

2. The electro-optic device according to claim 1, wherein

the drive circuit changes the voltage range of the drive voltage for the pixels corresponding to each of the colors in accordance with the mixture ratio of the plurality of colors, the voltage range corresponding to the same grayscale level is different between the pixels corresponding to each of the colors.

3. The electro-optic device according to claim 1, wherein

the sub-fields have respective periods the same as each other, and

the drive pattern of the pixel corresponding to the color having narrower one of the voltage ranges of the drive voltages corresponding to the mixture ratio of the plurality of colors has a longer period during which an ON-drive of the pixel continues compared to the drive pattern of the pixel corresponding to the color having wider one of the voltage ranges of the drive voltages at the same grayscale level.

4. The electro-optic device according to claim 2, wherein

the sub-fields include at least one sub-field having a different period, and

the period of the sub-field having a different period related to the drive of the pixel of the color having narrower one of the voltage ranges of the drive voltages corresponding to the mixture ratio of the plurality of colors is longer than the period of the corresponding sub-field having a different period related to the drive of the pixel of the color having wider one of the voltage ranges of the drive voltages.

5. The electro-optic device according to claim 1, wherein

at a maximum grayscale level, the pixel is driven with the drive pattern designating switching ON of the pixel at all of the sub-fields.

6. An electronic apparatus comprising the electro-optic device according to claim 1.