Temporal color liquid crystal display

• US 8,581,923 B2
• Filed: 10/07/2009
• Issued: 11/12/2013
• Est. Priority Date: 10/07/2009
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kerofsky, Louis Joseph
• Primary Examiner(s): Amini, Javid A
• Application Number:
  US12/587,418
• Publication Number:
  US 20110080423A1
• Time in Patent Office: 1,497 Days
• Field of Search: 345/593, 345/589, 345/590, 345/591
• US Class Current: 345/593
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• 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 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607

Abstract

A temporal based system for reducing the color artifacts of a field sequential color based liquid crystal display.

Claims

1. A method for modifying an image to be displayed on a liquid crystal display comprising:

(a) selecting, automatically and without user input, a first color based upon the content of said image and illuminating a backlight assembly with a substantially uniform backlight over the entire said display over a first sub-frame period at said selected first color;

(b) illuminating a backlight assembly with a substantially uniform backlight over the entire said display during each of at least three additional sub-frame time periods of a frame, wherein said light passes through said display free from passing through a color filter array;

(c) selecting a different color for illumination during each of said at least three additional sub-frame time periods of said frame, wherein one of said colors is said selected first color light source.

2. The method of claim 1 wherein said illumination is uniform during each sub-frame time period.

3. The method of claim 1 wherein said different colors include red during one of said additional sub-frame time periods, blue during another one of said additional sub-frame time periods, and green during another one of said additional sub-frame time periods.

4. The method of claim 1 wherein said first color is a combination of at least two of red, blue, and green colors.

5. The method of claim 1 wherein said backlight assembly includes a red light source.

6. The method of claim 5 wherein said backlight assembly includes a blue light source.

7. The method of claim 6 wherein said backlight assembly includes a green light source.

8. The method of claim 1 wherein said backlight assembly includes a plurality of light emitting diodes.

9. The method of claim 8 wherein said light emitting diodes direct light into the display from the periphery thereof.

10. The method of claim 1 wherein said selection of said first color is based up reducing color breakup.

11. The method of claim 10 wherein said image is temporally decomposed based upon said selected first color.

12. The method of claim 11 wherein said backlight assembly is temporally illuminated based upon said temporal decomposition.

13. The method of claim 12 wherein said selection of said first color is based upon an estimation of eye motion.

14. The method of claim 13 wherein said temporally decomposed image is modified based upon said estimation.

15. The method of claim 14 wherein said modified image is temporally displayed on said display.

16. The method of claim 1 wherein a region of said image is determined to have uniform motion independent of whether all pixels within said region have such uniform motion.

17. The method of claim 16 wherein said region of said image is compensated based upon an estimation of eye motion.

18. The method of claim 17 wherein said another region of said image is not compensated based upon said estimation of eye motion.