Compensated LCD display

• US 20110148900A1
• Filed: 12/21/2009
• Published: 06/23/2011
• Est. Priority Date: 12/21/2009
• Status: Active Grant

• 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: Daly, Scott J., Feng, Xiao-fan
• Granted Patent: US 8,947,339 B2
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• 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

Abstract

A method for displaying an input image on a display includes receiving the input image to be displayed on the display. The image is modified with a first process to determine a driving signal for a two-dimensional backlight array of independently selectable light emitting elements of the display. The first modified image is modified with a second noise reducing process to determine a driving signal for a two-dimensional liquid crystal layer defining pixels of the display. The two-dimensional backlight array has a different density of light emitting elements than the two-dimensional liquid crystal layer defining the pixels of the display.

Claims

1. A method for displaying an input image on a display comprising:

(a) receiving said input image to be displayed on said display;

(b) modifying said image with a first process to determine a driving signal for a two-dimensional backlight array of independently selectable light emitting elements of said display;

(c) modifying said first modified image with a second noise reducing process to determine a driving signal for a two-dimensional liquid crystal layer defining pixels of said display;

(d) wherein said two-dimensional backlight array has a different density of light emitting elements than said two-dimensional liquid crystal layer defining said pixels of said display.

2. The method of claim 1 wherein said first process includes a non-linear filter.

3. The method of claim 1 wherein said first process sub-samples said input image.

4. The method of claim 1 wherein said first process includes a non-linear filter and sub-samples said input image.

5. The method of claim 4 further including up-sampling said first modified input image to substantially simulate the anticipated illumination from said backlight array.

6. The method of claim 5 further including the step of creating a liquid crystal layer image based upon said up-sampled first modified input image and said input image.

7. The method of claim 6 wherein said liquid crystal layer image is filtered by said second noise reducing process.

8. The method of claim 7 wherein said creating is based upon a division operation.

9. A method for displaying an input image on a display comprising:

(a) receiving said input image to be displayed on said display;

(b) separating said input image into a first signal suitable for a two-dimensional backlight array of independently selectable light emitting elements of said display and a second signal suitable for a two-dimensional liquid crystal layer defining pixels of said display;

(c) wherein said signal suitable for said two-dimensional liquid crystal layer further includes a noise reduction process after said separation.

10. The method of claim 9 wherein said first signal has been processed by a non-linear filter.

11. The method of claim 9 wherein said first signal has been processed by a sub-sampling process.

12. The method of claim 9 wherein said first signal has been processed by a non-linear filter and a sub-sampling process.

13. The method of claim 12 further including up-sampling said first signal to substantially simulate the anticipated illumination from said backlight array.

14. The method of claim 13 further including the step of creating a liquid crystal layer image based upon said up-sampled first signal and said input image.

15. The method of claim 9 wherein said separation is based upon a division operation.