Image display device, method of driving image display device, and electronic apparatus

• US 7,570,395 B2
• Filed: 12/06/2005
• Issued: 08/04/2009
• Est. Priority Date: 01/21/2005
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Epson Imaging Devices Corporation (Seiko Group)
• Inventors: Kurumisawa, Takashi
• Primary Examiner(s): Thompson; James A
• Application Number:
  US11/294,600
• Publication Number:
  US 20060164698A1
• Time in Patent Office: 1,337 Days
• Field of Search: 358/1.9, 358/3.23, 358/3.24, 358/1.2, 358/3.01, 358/3.26, 345/603, 345/604
• US Class Current: 358/3.23
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

An image display device in which one dot is displayed using M (M is an integer larger than 3) sub-pixels having different colors and being disposed adjacent to each other in a vertical direction or horizontal direction, a ratio of a length of the sub-pixel of the one dot in a disposition direction to a length, in a direction orthogonal to the disposition direction being M:3, includes a resolution converter that converts the resolution in the disposition direction of the image data which defines an image to be displayed for every dot to 3/M; a color separating unit that separates the image data converted by the resolution converter into color components corresponding to the M sub-pixels for every dot; and a driving circuit that drives the sub-pixels so as to have a resolution defined by the image data separated by the color separating unit.

Claims

1. An image display device, comprising:

a plurality of dots each of which comprises M sub-pixels configured to display different colors and being disposed adjacent to each other in a first direction, wherein

M is an integer greater than 3, and

a ratio of a length of each dot in the first direction to a length of said dot in a second direction orthogonal to the first direction is M;

3;

a resolution converter for reducing a resolution in the first direction of input image data, which defines an image to be displayed by every dot, by 3/M;

a color separating unit for separating color components of the image data converted by the resolution converter into color components corresponding to the M sub-pixels for every dot; and

a driving circuit for driving the sub-pixels to display the image at a resolution defined by the image data outputted by the color separating unit.

2. The image display device according to claim 1, wherein

the input image data comprises M dot image data;

and

the resolution converter is configured for

determining whether the M dot image data is of achromatic color, and then

converting the M dot image data to 3 dot image data in accordance with a predetermined rule on the basis of the determination.

3. The image display device according to claim 2, wherein the resolution converter is further configured for, when it is determined that the M dot image data is of achromatic color,

comparing luminance information of the M dot image data with a predetermined threshold value, and then

converting the M dot image data into the 3 dot image data on the basis of the comparison.

4. The image display device according to claim 2, wherein the resolution converter is further configured for, when it is determined that the M dot image data is not of achromatic color,

distributing a predetermined coefficient in the M dot image data to change the M dot image data into the 3 dot image data.

5. The image display device according to claim 1, wherein M is 4.

6. An electronic apparatus, comprising:

the image display device according to claim 1.

8. The method according to claim 6, wherein

the input image data comprises M dot image data;

and

the converting further comprises

determining whether the M dot image data is of achromatic color, and then

converting the M dot image data to 3 dot image data in accordance with a predetermined rule on the basis of the determination.

9. The method according to claim 8, wherein the converting further comprises, when it is determined that the M dot image data is of achromatic color,

comparing luminance information of the M dot image data with a predetermined threshold value, and then

converting the M dot image data into the 3 dot image data on the basis of the comparison.

10. The method according to claim 8, wherein the converting further comprises, when it is determined that the M dot image data is not of achromatic color,

distributing a predetermined coefficient in the M dot image data to change the M dot image data into the 3 dot image data.

11. The method according to claim 8, wherein M is 4.

7. A method of driving an image display device in which each of a plurality of dots comprises M sub-pixels configured to display different colors and being disposed adjacent to each other in a first direction, wherein

M is an integer greater than 3, and

a ratio of a length of each dot in the first direction to a length of said dot in a second direction orthogonal to the first direction is M:

3;

the method comprising;

converting input image data, which defines an image to be displayed by every dot, wherein said converting comprises reducing, by a resolution converter, a resolution in the first direction of the input image data by 3/M;

separating, by a color separating unit, color components of the image data converted by the resolution converter into color components corresponding to the M sub-pixels for every dot; and

driving, by a driving unit, the sub-pixels to display the image at a resolution defined by the image data outputted by the color separating unit.

12. An image display device in which one dot is displayed using M (M is an integer larger than 3) sub-pixels having different colors and being disposed adjacent to each other in a vertical direction or horizontal direction, a ratio of a length of a sub-pixel of the one dot in a disposition direction to a length in a direction orthogonal to the disposition direction being M:

3, comprising;

a resolution converter that converts the resolution in the disposition direction of the image data which defines an image to be displayed for every dot to 3/M;

a color separating unit that separates color components of the image data converted by the resolution converter into color components corresponding to the M sub-pixels for every dot; and

a driving circuit that drives the sub-pixels so as to have a resolution defined by the image data separated by the color separating unit;

wherein the resolution converter determines whether the M dot image data is of achromatic, and then converts 3 dot image data with a predetermined rule on the basis of the determination.

13. The image display device according to claim 12, wherein when it is determined that the M dots are of achromatic on the basis of the M dot image data, the resolution converter compares luminance information of the M dot image data with a predetermined threshold value, and then converts the M dot image data into 3 dot image data on the basis of the comparison.

14. The image display device according to claim 12, wherein when it is determined that the M dot image data is not of achromatic, the resolution converter distributes a predetermined coefficient in the M dot image data to change the M dot image data into 3 dot image data.

15. The image display device according to claim 12, wherein M is 4.