Light Valve Display Using Low Resolution Programmable Color Backlighting

• US 20090153461A1
• Filed: 09/14/2007
• Published: 06/18/2009
• Est. Priority Date: 09/15/2006
• Status: Abandoned Application

• Current Assignee: Istvan Gorog
• Original Assignee: Thomson Licensing LLC (The Woodbridge Co. Ltd.)
• Inventors: Gorog, Istvan
• Application Number:
  US12/083,441
• Publication Number:
  US 20090153461A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• 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

Abstract

A display comprises a front-end component having a matrix of neutral light valves that defines the resolution of the display. A backlight unit provides backlighting for the front-end component and has a plurality of individual elements grouped into repeat units, wherein the individual elements in the repeat units differ in color and the repeat units have a resolution less than the display resolution. All individual elements in individual repeat units are capable of simultaneously emitting light incident on more than one neutral light valve.

Claims

1. A display comprising:

a front-end component having a plurality of neutral light valves, the neutral light valves defining a display resolution;

a backlight unit having a plurality separate color elements grouped into repeat units, the separate color elements emit light in a non-color sequential manner in response to backlight drive information, the repeat units having a resolution less than the display resolution and the backlight drive information correlating to lower resolution data than the display resolution;

a luminance estimator receives the backlight drive information and calculates available light luminance values for neutral light valves and produces a luminance signal;

an array pixel processor receives the luminance signal from the luminance estimator and converts the luminance signal to higher resolution luminance data of available luminance from the backlight unit; and

a shutter driver produces a shutter control signal to control the neutral light valves, the control signal derived from the product of the maximum throughput of neutral light valves and a ratio of input luminance values at the display resolution to the available luminance.

2. The display of claim 1, wherein the separate color elements simultaneously emit light.

3. The display of claim 2, wherein the light valves control luminance.

4. The display of claim 3, wherein the light valves are programmable.

5. The display of claim 4, wherein the backlight unit is a tricolor system.

6. The display of claim 5, wherein the backlight uses phosphor material which decay in a timeframe shorter than a frame period.

7. The display of claim 6, wherein the backlight unit is a field emission device.

8. The display of claim 7, wherein the front-end component is a liquid crystal device.

9. The display of claim 2, wherein the backlight is a programmable field emission device and front-end component is a liquid crystal device.

10. A method for displaying video images in a display having a low resolution multicolor backlight unit and a network of neutral light valves front-end that define a resolution of the display, comprising the steps of:

simultaneously emitting a plurality color light beams responsive to backlight drive information,

calculating available light luminance values for the neutral light valves and producing a luminance signal therefrom;

converting the luminance signal to higher resolution luminance data of available luminance from the backlight unit;

calculating a shutter control signal to control the neutral light valves, the shutter control signal derived at least in part from the product of the maximum throughput of the neutral light valves and a ratio of input luminance values at the display resolution to the available luminance; and

,

driving the neutral light valves with the shutter control signal.