Field sequential color efficiency

• US 20050237596A1
• Filed: 05/06/2003
• Published: 10/27/2005
• Est. Priority Date: 05/06/2002
• Status: Active Grant

• Current Assignee: Rambus Delaware
• Original Assignee: Uni-Pixel Displays Incorporated (Uni-Pixel Incorporated)
• Inventors: Selbrede, Martin G.
• Granted Patent: US 7,057,790 B2
• Time in Patent Office: Days
• US Class Current: 359/276
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

A method and system for generating colors efficiently. In one embodiment, a start signal for a primary color subcycle may be received. A primary light source used to drive the primary color may be activated if there is data in the primary color'"'"'s buffer. The primary light source may be deactivated during the primary color subcycle if there is no data in the primary color'"'"'s buffer. In another embodiment, a highest amplitude signal for one of a plurality of primary colors may be normalized. A drive light source intensity may be adjusted to a percentage or a maximum intensity where the percentage corresponds to a content of the normalized primary color in a frame. The amplitude of all but the normalized primary color may be adjusted proportionally. In another embodiment, a maximum intensity for a light source intensity may be set to a first value. A maximum pixel intensity for each of a plurality of pixels may be set to a second value. The maximum intensity for the light source intensity may be adjusted by the first value divided by the second value. An amplitude for each of the plurality of pixels may be adjusted by the second value divided by the first value.

Claims

1. A method for generating colors efficiently in a field sequential color display system comprising the steps of:

waiting for a start signal for a primary color subcycle;

receiving said start signal;

activating a primary light source used to drive said primary color during said primary color subcycle if there is data in said primary color'"'"'s buffer;

continuing to activate said primary light source during said primary color subcycle until there is no data in said primary color'"'"'s buffer; and

deactivating said primary light source during said primary color subcycle if there is no data in said primary color'"'"'s buffer.

2. The method as recited in claim 1, wherein a triggering event for said activation of said primary light source is trailing edge.

4. The method as recited in claim 1, wherein a triggering event for said activation of said primary light source is leading edge.

3. A method for generating colors efficiently in a field sequential color display system comprising the steps of:

waiting for a start signal for a primary color subcycle;

receiving said start signal;

delaying an activation of a primary light source used to drive said primary color during said primary color subcycle until there is data in said primary color'"'"'s buffer;

activating said primary light source during said primary color subcycle if there is data in said primary color'"'"'s buffer;

continuing to activate said primary light source during said primary color subcycle until there is no data in said primary color'"'"'s buffer; and

deactivating said primary light source during said primary color subcycle if there is no data in said primary color'"'"'s buffer.

5. A method for generating colors efficiently in a field sequential color display system comprising the steps of:

normalizing a highest amplitude signal for one of a plurality of primary colors;

adjusting a drive light source intensity to a percentage of a maximum intensity, wherein said percentage corresponds to a content of said one of said plurality of primary colors in a frame; and

adjusting an amplitude of all but said one of said plurality of primary colors proportionally.

6. A method for generating colors efficiently in a field sequential color display system comprising the steps of:

setting a maximum intensity for a light source intensity to a first value;

setting a maximum pixel intensity for each of a plurality of pixels to a second value;

adjusting said maximum intensity for said light source intensity by said first value divided by said second value; and

adjusting an amplitude for each of said plurality of pixels by said second value divided by said first value.

7. A system, comprising:

a plurality of pixels on a display; and

a light source configured to generate a primary color on said display by activating and deactivating said plurality of pixels, wherein a maximum intensity for a light source intensity of said light source is set to a first value, wherein a maximum pixel intensity for each of said plurality of pixels is set to a second value, wherein said maximum intensity for said light source intensity is adjusted by said first value divided by said second value, wherein an amplitude for each of said plurality of pixels is adjusted by said second value divided by said first value.

8. A system, comprising:

a plurality of pixels on a display; and

a plurality of light sources configured to generate a plurality of primary colors on said display by activating and deactivating said plurality of pixels, wherein a highest amplitude signal for one of said plurality of primary colors is normalized, wherein a drive light source intensity for each of said plurality of light sources is adjusted to a percentage of a maximum intensity, wherein said percentage corresponds to a content of said one of said plurality of primary colors in a frame, wherein an amplitude of all but said one of said plurality of primary colors is adjusted proportionally.