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High Contrast Grayscale and Color Displays

a grayscale and color display technology, applied in optics, instruments, electrical equipment, etc., can solve the problems of starfield reproduction deficiencies of hdr displays, and achieve the effect of improving spatially localized contrast in lcd panels and higher resolution

Inactive Publication Date: 2013-12-19
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention improves the quality of LCD panels and displays by using multiple modulation layers. These layers can include LCD panels, grayscale LCD panels, and RGB color panels without color filters. The use of panels without color filters provides higher resolutions. Overall, the invention enhances the contrast and clarity of the display for better visual representation.

Problems solved by technology

However, commercially available HDR displays have deficiencies in reproducing starfields and other challenging images mainly due to parallax, backlight leakage, and other issues, and artifacts resulting therefrom.

Method used

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  • High Contrast Grayscale and Color Displays
  • High Contrast Grayscale and Color Displays
  • High Contrast Grayscale and Color Displays

Examples

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Embodiment Construction

[0045]Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts, and more particularly to FIG. 1 thereof, there is illustrated a new construction for a high dynamic range display 100 according to an embodiment of the present invention. The display 100 includes a backlight 110 which may be a standard CCFL or other broadband lighting source (e.g., LEDs, OLEDs, etc.). In addition, the backlight may be direct lit (light source(s) directly illuminating downstream modulation panels) or edge lit (as is popular in many thin screen LCD display designs). Further yet, the backlight may be constant, globally dimmed, or locally dimmed. The light source for this display can be white, controllable luminance, or multiple color driven.

[0046]The backlight 110 illuminates downstream modulators, including, in this example, an LCD panel 120 which modulates the backlight in intensity and color. A controllable polarizer (or contrast-improving panel) 130 furt...

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Abstract

A high contrast high resolution display is produced using an image chain comprising a plurality of downstream high resolution modulators. The modulators may be illuminated by a locally dimmed backlight. Polarization control is maintained throughout the image chain via reference and analyzing polarizers combined with non-depolarizing layers. The modulators are grayscale and modulate at the sub-pixel level. A color panel may be maintained for embodiments that require color. Diffusion in the chain is matched to a resolution of the image content carried in the light such that the effects of local dimming and sub-pixel resolution are preserved. Brightness enhancement films may be utilized to enhance brightness and maintain polarization control.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Patent Application No. 61 / 450,802 filed 9 Mar. 2011, hereby incorporated by reference in its entirety.FIELD OF INVENTION[0002]The present invention relates to High Dynamic Range Displays (HDR), and more particularly to Grayscale HDR displays using dual modulation.DISCUSSION OF BACKGROUND[0003]High Dynamic Range (HDR) displays are generally defined as having a dynamic range of greater than 800 to 1. Recent advances in technology have produced displays claiming contrast ratios of more than 1,000,000 to 1.[0004]Generally speaking, these higher contrast ratio HDR displays utilize local dimming of the backlight that illuminates the LCD panel. An early patent in this area, U.S. Pat. No. 6,891,672, by Whitehead, Ward, Stuerzlinger, and Seetzen entitled “HIGH DYNAMIC RANGE DISPLAY DEVICES” describes the fundamental techniques. Such techniques include illuminating the LCD panel with an approxima...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G09G3/36G02F1/1335
CPCG09G3/3607G02F1/133528G02F1/1323G02F1/13318G02F1/133504G02F1/133536G02F1/133606G02F1/133609G02F1/133611G02F1/13471G02F2203/30G02F2203/34G09G3/003G09G3/3426G09G3/3611G09G2300/023G09G2320/0238G09G2320/0242G09G2320/0646G09G2340/0457G09G2360/145G09G2360/16G02F1/133601G02F1/133622G02F1/134345H04N13/332H04N13/356H04N13/361H04N13/324H04N13/337H04N13/351
Inventor GILBERT, JOHNSELINE, CHRISTOPHER J.
Owner DOLBY LAB LICENSING CORP
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