Method, apparatus and system for forming filter elements on display substrates
A method and system for forming filter elements on a plurality of display substrates using a digital imaging system operable to selectively deposit filter material at a plurality of deposition locations is disclosed. The method involves receiving orientation information defining a disposition of a plurality of pixels associated with the at least one display substrate, identifying pixels in the plurality of pixels that are to receive filter material for forming a filter element on the pixel, selecting deposition locations within each of the identified pixels in accordance with the orientation information to meet an alignment criterion associated with placement of the filter element within the pixel, and controlling the digital imaging system to cause deposition of the filter material at the selected deposition locations. A method and system for forming filter elements on a substrate is also disclosed, which involves selecting locations to receive filter material for forming filter elements on the substrate, introducing a random variation in placement of the filter elements, and forming filter elements at the selected locations, the substrate being subsequently aligned to a display substrate for forming a display. A method and system for forming filter elements on a display substrate is also disclosed, which involves selectively depositing filter material to form the filter elements on a plurality of pixels associated with the display substrate, and selectively exposing the deposited filter material to thermal laser radiation to condition the deposited filter material.
1. A method for forming filter elements on at least one display substrate using a digital imaging system operable to selectively deposit filter material at a plurality of deposition locations, the method comprising:
receiving orientation information defining a disposition of a plurality of pixels associated with the at least one display substrate;
identifying pixels in said plurality of pixels that are to receive filter material for forming a filter element on the pixel, each identified pixel having associated boundaries within which the filter element is to be placed;
for each of said identified pixels, selecting deposition locations within that pixel in accordance with said orientation information to meet an alignment criterion associated with placement of the filter element within that pixel, said alignment criterion comprising a threshold value representing a permitted deviation in placement of the filter element with respect to said boundaries, said selected deposition locations causing placement of the filter element to be shifted within said threshold value when said sequentially shifted placement exceeds said threshold value, but not to be shifted while said sequentially shifted placement remains within said threshold value;
introducing a random variation in said threshold value to achieve a random variation in placement of the filter element, said random variation being operable to disrupt regular patterns that occur in filter element placement; and
controlling the digital imaging system to cause deposition of the filter material at said selected deposition locations in each of said identified pixels.
2. The method of claim 1 wherein selecting deposition locations to cause placement of the filter element to be shifted back within said threshold value comprises selecting deposition locations that are shifted with respect to said boundaries by at least a spacing between adjacent deposition locations.
3. The method of claim 1 wherein identifying said pixels comprises randomly identifying pixels in said plurality of pixels to receive one of a plurality of colored filter materials to cause resulting filter elements of each color to be randomly dispersed across each display substrate.
4. A display apparatus having filter elements formed in accordance with the method of claim 1 .
5. A digital imaging system operable to selectively deposit filter material at a plurality of deposition locations to form filter elements on at least one display substrate, the digital imaging system comprising a controller operably configured to:
receive orientation information defining a disposition of a plurality of pixels associated with the at least one display substrate;
identify pixels in said plurality of pixels that are to receive filter material for forming a filter element on the pixel, each identified pixel having associated boundaries within which the filter element is to be placed;
for each of said identified pixels, select deposition locations within that pixel in accordance with said orientation information to meet an alignment criterion associated with placement of the filter element within that pixel, said alignment criterion comprising a threshold value representing a permitted deviation in placement of the filter element with respect to said boundaries;
introduce a random variation in said threshold value to achieve a random variation in placement of the filter element, said random variation being operable to disrupt regular patterns that occur in filter element placement; and
control the digital imaging system to cause deposition of the filter material at said selected deposition locations in each of said identified pixels, the controller being operably configured to select deposition locations to cause placement of the filter element to be shifted within said threshold value when said sequentially shifted placement exceeds said threshold value, but not to be shifted while said sequentially shifted placement remains within said threshold value.
6. The system of claim 5 wherein the controller is operably configured to select deposition locations to cause placement of the filter element to be shifted back by selecting deposition locations that are shifted with respect to said boundaries by at least a spacing between adjacent deposition locations.
7. The system of claim 5 wherein the controller is operably configured to identify said pixels by randomly identifying pixels in said plurality of pixels to receive one of a plurality of colored filter materials to cause resulting filter elements of each color to be randomly dispersed across each display substrate.