White Balance Adjustment

• US 20080108384A1
• Filed: 10/19/2005
• Published: 05/08/2008
• Est. Priority Date: 11/10/2004
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Mobile Communications AB (Sony Group Corp.)
• Inventors: Hunt, Alexander
• Granted Patent: US 8,285,038 B2
• Time in Patent Office: Days
• US Class Current: 455/556.1
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 1/6077 Colour balance, e.g. colour cast correction
• CPC Class Codes: H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control camera processing pipelines for colour balance H04N23/88

Abstract

A white balance adjustment device for a colour display of a portable communication device, said white balance adjustment device (1) comprising: a first image signal adjuster (2) for adjusting a signal level of a first digital image signal (2acorresponding to a first colour, a second image signal adjuster (3) for adjusting a signal level of a second digital image signal (3a) corresponding to a second colour, and a third image signal adjuster (4) for adjusting a signal level of a third digital image signal (4a) corresponding to a third colour, wherein said while balance adjustment device (1) is arranged to control said first (2), second (3) and third (4) image signal adjusters depending on user input from a user of the portable electronic communication device to his/her preference.

Claims

1. A white balance adjustment device for a colour display of a portable communication device, said white balance adjustment device (1) comprising:

a first image signal adjuster (2) for adjusting a signal level of a first digital image signal (2a) corresponding to a first colour,

a second image signal adjuster (3) for adjusting a signal level of a second digital image signal (3a) corresponding to a second colour,

and a third image signal adjuster (4) for adjusting a signal level of a third digital image signal (4a) corresponding to a third colour,

wherein said white balance adjustment device (1) is arranged to control said first (2), second (3) and third (4) image signal adjusters depending on user input from a user of the portable electronic communication device to his/her preference.

2. The white balance adjustment device of claim 1, wherein said first, second and third image signal adjusters (2, 3, 4) are arranged to adjust said first, second and third signal (2a, 3a, 4a) so as to achieve a predetermined ratio among the signal levels.

3. The white balance adjustment device of claim 2, wherein said first, second and third image signal adjusters (2, 3, 4) are arranged to adjust gain.

4. The white balance adjustment device of any one of the claims 1-3, wherein said user input is provided by means of selecting a setting of white balance in a menu for white balance adjustment.

5. The white balance adjustment device of any one of the previous claims 1-4, wherein said image signal adjusters (2, 3, 4) are arranged to adjust three primary colours.

6. The white balance adjustment device of claim 4, wherein the image signal adjusters (2, 3, 4) are arranged to be either increased or decreased in setting depending on user preference.

7. The white balance adjustment device of claim 5, wherein said image signal adjusters (2, 3, 4) are arranged to adjust red, green and blue colour.

8. The white balance adjustment device of any one of the previous claims, wherein the colours can be arranged as 8, 12, 16, 18, 24 and 32 bit colour information that can be adjusted.

9. The white balance adjustment device of any one of the previous claims, wherein said white balance adjustment device (1) is arranged in a particular companion chip to the conventional circuitry of the portable communication device (10).

10. The adjustment device of any one of the previous claims 1-9, wherein said adjustment device (1) is provided as a software only solution.

11. The adjustment device of claim 1-10, wherein said adjustment device (1) is integrated in a display driver.

12. A portable electronic communication device comprising:

a white balance adjustment device for a colour display of a portable communication device, said white balance adjustment device (1) comprising;

a first image signal adjuster (2) for adjusting a signal level of a first digital image signal (2a) corresponding to a first colour,

a second image signal adjuster (3) for adjusting a signal level of a second digital image signal (3a) corresponding to a second colour,

and a third image signal adjuster (4) for adjusting a signal level of a third digital image signal (4a) corresponding to a third colour,

wherein said white balance adjustment device (1) is arranged to control said first (2), second (3) and third (4) image signal adjusters depending on user input from a user of the portable electronic communication device to his/her preference.