Field sequential light source modulation for a digital display system
A digital display system consists of an image modulator and multiple light modulators. An image processing system processes an incoming data stream, scans processed data to an image modulator and controls for the light modulators. Other user inputs and sensors are used to affect the processing and controls. The timing for scanning the processed data into the image modulators is controlled along with the intensity and wavelength of the light modulators. The display system may implement a spatial and temporal image processing, digital shutter controls, rolling shutter controls, sequential color output, adaptive dynamic sensor feedback, frame rate matching, motion compensated field sequencing and a variety of other techniques to produce a high quality display output. The resulting display has improved image consistency, enhanced color gamut, higher dynamic range and is better able to portray high motion content.
1. A method of displaying images on a flat panel display, comprising:
positioning three or more different wavelength LED light sources at different locations relative to the image modulator pixels in said display;
separately, by light source controls, varying brightnesses of said light sources within different regions of said display;
scanning pixel values into individually controllable pixels in an image modulator array having a modulator resolution, during an image modulator scanning time; and
using one or more controllers for
receiving an input data stream containing image data,
spatial processing image data for a display frame into three or more image color fields each corresponding to a different wavelength,
filtering said image color fields to match said image modulator resolution, and
filtering image data to a light source resolution, lower than said image modulator resolution, for controlling said LED light sources;
wherein each of said image color fields has both a duration and an LED color combination which can be varied by said light source controls switching LEDs for successive color fields.
2. The method of claim 1 further comprising:
sequencing, by said one or more controllers, said image color fields to correspond to a sequence of image modulator pixel values such that image modulator data sets can each vary with different light source color fields, and
cycling LEDs of equal wavelength with a rolling shutter.
3. The method of claim 1 further comprising adaptively and dynamically compensating brightness of one or more of said light sources based on their positions relative to the display screen, and varying controls of said image modulator, in response to sensor feedback.
4. The method of claim 1 further comprising controlling brightnesses and durations of illumination of three or more different wavelength LED arrays, based on each array's position relative to said display, to vary composite colors of said light sources in response to sensor feedback.
5. The method of claim 1 further comprising synchronizing spatial processing image data into color fields with using said sequential fields to modulate pixel fields, and wherein LEDs for a given wavelength are not cycled all at once but used with a rolling shutter.