Display device, drive method therefor, and electronic apparatus

• US 20090295839A1
• Filed: 05/13/2009
• Published: 12/03/2009
• Est. Priority Date: 05/20/2008
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asano, Mitsuyasu, Furukawa, Norimasa, Nishi, Tomohiro
• Granted Patent: US 8,456,413 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2310/0248 Precharge or discharge of column electrodes before or after applying exact column voltages
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A display device includes: a light source section having multiple light sources to emit light in illumination colors including three primary colors of light; a display section for displaying an image in monochrome color by modulating the light emitted from the light source section; and a display control section for driving the light source section and the display section in a field sequential system. The display control section includes a determining section for determining a degree of white or a degree of complementary color of the light sources on the basis of an amount of lighting of each of the illumination colors of the light sources, a setting section for setting white components or complementary-color components of a color determined by a mixing ratio of the illumination colors, and an allocating section for allocating the set white components or the complementary-color components to the fields.

Claims

1. A display device comprising:

a light source section having multiple light sources arranged in a plane to emit light in illumination colors including three primary colors of light;

a display section configured to display an image in monochrome color by modulating the light emitted from the light source section; and

a display control section configured to drive the light source section and the display section in a field sequential system in which the illumination colors of the light sources are switched for respective fields in one frame to perform color display;

wherein the display control section includes

determining means for determining a degree of white or a degree of complementary color of the light sources on a basis of an amount of lighting of each of the illumination colors of the light sources, the amount of lighting being determined in accordance with a signal of a color image to be displayed,

setting means for setting white components or complementary-color components of a color determined by a mixing ratio of the illumination colors, on a basis of a result of the determination performed by the determining means, and

allocating means for allocating the white components or the complementary-color components, set by the setting means, to the fields.

2. A display device according to claim 1, wherein the determining means determines the degree of white or the degree of complementary color of the light sources on a basis of reference white or reference complementary color based on the illumination color having a lowest one of the amounts of lighting of the illumination colors.

3. The display device according to claim 1, wherein the light source section has a light-emitting area in which the light sources are arranged, the light-emitting area being divided into partial light-emitting areas, and

the display control section partially drives the light source section, for each partial light-emitting area, to allocate the white components or the complementary-color components to the fields.

4. The display device according to claim 3, wherein, with respect to the partial light-emitting area in which all of the illumination colors are lit, the display control section allocates the reference white to the fields.

5. The display device according to claim 3, wherein the display control section uses, as the reference complementary color, a complementary color obtained by extinguishing a predetermined one color that becomes a complementary color, on a basis of a ratio of the illumination colors that constitute the reference white.

6. The display device according to claim 1, wherein, with respect to the partial light-emitting area at which a display image has a primary color, the display control section sets a field in which the primary color is to be mainly displayed and causes light of the primary color to be lit in the set field.

7. The display device according to claim 6, wherein the display control section allocates the amount of lighting of the primary color to the fields, when the amount of lighting of the primary color of the partial light-emitting area located in a neighborhood of the partial light-emitting area to be controlled is smaller than a predetermined value and the amount of lighting of another primary color is smaller than a predetermined value.

8. A drive method for a display device that has a light source section having multiple light sources arranged in a plane to emit light in illumination colors including three primary colors of light and a display section configured to display an image in monochrome color by modulating the light emitted from the light source section, wherein during driving of the display device in a field sequential system in which the illumination colors of the light sources are switched for respective fields in one frame to perform color display, the drive method comprising the steps of:

determining a degree of white or a degree of complementary color of the light sources on a basis of an amount of lighting of each of the illumination colors of the light sources, the amount of lighting being determined in accordance with a signal of a color image to be displayed;

setting white components or complementary-color components of a color determined by a mixing ratio of the illumination colors, on a basis of a result of the determination performed in the determining step; and

allocating the set white components or the complementary-color components to the fields.

9. An electronic apparatus comprising a display device having:

a light source section having multiple light sources arranged in a plane to emit light in illumination colors including three primary colors of light;

a display section configured to display an image in monochrome color by modulating the light emitted from the light source section; and

a display control section configured to drive the light source section and the display section in a field sequential system in which the illumination colors of the light sources are switched for respective fields in one frame to perform color display;

where the display control section includes

determining means for determining a degree of white or a degree of complementary color of the light sources on a basis of an amount of lighting of each of the illumination colors of the light sources, the amount of lighting being determined in accordance with a signal of a color image to be displayed,

setting means for setting white components or complementary-color components of a color determined by a mixing ratio of the illumination colors, on a basis of a result of the determination performed by the determining means, and

allocating means for allocating the white components or the complementary-color components, set by the setting means, to the fields.

10. A display device comprising:

a light source section having multiple light sources arranged in a plane to emit light in illumination colors including three primary colors of light;

a display section configured to display an image in monochrome color by modulating the light emitted from the light source section; and

a display control section configured to drive the light source section and the display section in a field sequential system in which the illumination colors of the light sources are switched for respective fields in one frame to perform color display;

wherein the display control section includes

a determining section configured to determine a degree of white or a degree of complementary color of the light sources on a basis of an amount of lighting of each of the illumination colors of the light sources, the amount of lighting being determined in accordance with a signal of a color image to be displayed,

a setting section configured to set white components or complementary-color components of a color determined by a mixing ratio of the illumination colors, on a basis of a result of the determination performed by the determining section, and

an allocating section configured to allocate the white components or the complementary-color components, set by the setting section, to the fields.

11. A display device according to claim 10, wherein the determining section determines the degree of white or the degree of complementary color of the light sources on a basis of reference white or reference complementary color based on the illumination color having a lowest one of the amounts of lighting of the illumination colors.

12. The display device according to claim 10, wherein the light source section has a light-emitting area in which the light sources are arranged, the light-emitting area being divided into partial light-emitting areas, and

the display control section partially drives the light source section, for each partial light-emitting area, to allocate the white components or the complementary-color components to the fields.

13. The display device according to claim 12, wherein, with respect to the partial light-emitting area in which all of the illumination colors are lit, the display control section allocates the reference white to the fields.

14. The display device according to claim 12, wherein the display control section uses, as the reference complementary color, a complementary color obtained by extinguishing a predetermined one color that becomes a complementary color, on a basis of a ratio of the illumination colors that constitute the reference white.

15. The display device according to claim 10, wherein, with respect to the partial light-emitting area at which a display image has a primary color, the display control section sets a field in which the primary color is to be mainly displayed and causes light of the primary color to be lit in the set field.

16. The display device according to claim 15, wherein the display control section allocates the amount of lighting of the primary color to the fields, when the amount of lighting of the primary color of the partial light-emitting area located in a neighborhood of the partial light-emitting area to be controlled is smaller than a predetermined value and the amount of lighting of another primary color is smaller than a predetermined value.

17. An electronic apparatus comprising a display device having:

a light source section having multiple light sources arranged in a plane to emit light in illumination colors including three primary colors of light;

a display section configured to display an image in monochrome color by modulating the light emitted from the light source section; and

a display control section configured to drive the light source section and the display section in a field sequential system in which the illumination colors of the light sources are switched for respective fields in one frame to perform color display;

where the display control section includes

a determining section configured to determine a degree of white or a degree of complementary color of the light sources on a basis of an amount of lighting of each of the illumination colors of the light sources, the amount of lighting being determined in accordance with a signal of a color image to be displayed,

a setting section configured to set white components or complementary-color components of a color determined by a mixing ratio of the illumination colors, on a basis of a result of the determination performed by the determining section, and

an allocating section configured to allocate the white components or the complementary-color components, set by the setting section, to the fields.