Matrix addressable display with delay locked loop controller

A matrix addressable display for producing an image in response to an image signal having an image component and a sync component, comprising:

• a sync stripping circuit coupled to receive the image signal and operative to produce a sync signal in response to the sync component;
• a delay chain including a plurality of serially coupled delay elements coupled to receive the sync signal, wherein each delay element has a variable delay responsive to a delay signal;
• a comparator coupled to receive the sync signal and an output signal of a selected one of the delay elements, the comparator producing the delay signal in response to a phase difference between the sync signal and the output signal of the selected delay element;
• and
• a first line driving circuit coupled to receive the image component and to receive output signals from the delay elements.

An image display apparatus, comprising:

• a video signal generator for producing an image signal;
• a display screen;
• a matrix array aligned to the display screen;
• a sync stripping circuit coupled to receive the image signal and operative to produce a sync signal in response to the sync component;
• a delay chain including a plurality of serially coupled delay elements coupled to receive the sync signal, wherein each delay element has a variable delay responsive to a delay signal;
• a comparator coupled to receive the sync signal and an output signal of a selected one of the delay elements, the comparator producing the delay signal in response to a phase difference between the sync signal and the output signal of the selected delay element;
• and
• a first line driving circuit coupled to receive the image component and to receive output signals from the delay elements, the first line driving circuit having a plurality of outputs coupled to the matrix array.

A method of controlling a matrix addressable display in response to an image signal, the display including an array of light emitting assemblies arranged in rows and columns, comprising the steps of:

• stripping the image signal to produce a sync signal;
• delaying the sync signal a plurality of delay intervals to produce a plurality of delayed signals, each delay interval having a duration;
• after each of a selected plurality of the delay intervals, activating the respective rows or columns of the array in response to the respective delayed signal;
• selecting a reference delayed signal from the plurality of delayed signals;
• comparing the sync signal and the reference delayed signal;
• and
• adjusting the durations of the delay intervals in response to the comparison of the sync signal and the reference delayed signal.

A method of providing a displayed image in a matrix addressable display in response to an image signal having a sync component and an image component, wherein the display includes a display panel including a plurality of display elements, comprising the steps of:

• separating the sync component from the image component;
• delaying the sync component a selected delay time to produce a delayed sync component;
• comparing phases of the delayed sync component and the separated sync component;
• adjusting the selected delay time in response to the compared phases to produce an adjusted delayed sync component;
• and
• providing the image component to the display elements in response to the adjusted delayed sync component.