LCD error detection system
First Claim
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1. A process for detecting faulty liquid crystal display (LCD) cells in an (LCD) device comprising the steps:
- (1) displaying a first image (image A) on said LCD device;
(2) scanning and electronically storing said first image;
(3) displaying a second image (image B) on said LCD device where said second image is the inverse of said first image;
(4) scanning and electronically storing said second image;
(5) generating a third image (image A+B) from the matrix addition of said first and second images;
(6) selecting a threshold value to minimize processing time;
(7) analyzing a thresholded image generated from said third image;
(8) generating a bit map from said threshold image;
(9) locating the position of faulty LCD cells in said LCD device after conducting a connectivity analysis on said bit map;
(10) outputting the results of said locating step, such that the locations of said faulty LCD cells are provided.
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Abstract
The present invention is an error detection system for liquid crystal display (LCD) devices. The system comprises a photo-scanning device coupled to a computer and a LCD display driver. Faulty LCD cells are detected by using the photo-scanner to produce two images. The first image is produced by displaying a predetermined pattern on the LCD device. This pattern is inverted to produce the second image. By analyzing these two images, faulty LCD cells are located. The results of the analysis give the location of the faulty LCD cells.
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Citations
9 Claims
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1. A process for detecting faulty liquid crystal display (LCD) cells in an (LCD) device comprising the steps:
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(1) displaying a first image (image A) on said LCD device; (2) scanning and electronically storing said first image; (3) displaying a second image (image B) on said LCD device where said second image is the inverse of said first image; (4) scanning and electronically storing said second image; (5) generating a third image (image A+B) from the matrix addition of said first and second images; (6) selecting a threshold value to minimize processing time; (7) analyzing a thresholded image generated from said third image; (8) generating a bit map from said threshold image; (9) locating the position of faulty LCD cells in said LCD device after conducting a connectivity analysis on said bit map; (10) outputting the results of said locating step, such that the locations of said faulty LCD cells are provided. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display (LCD) error detection system comprising:
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scanner means for producing electronic images of a LCD device; LCD display driver means, coupled to said LCD device, for generating display signals to operate said LCD device; computing means, coupled to said scanner means and said LCD display driver means, for electronically storing said images of said LCD device, performing analysis on said images to locate the position of faulty LCD cells, and outputting the results of said analysis; said computing means coordinating operation of said scanner means and said LCD display driver means such that appropriate patterns appear on said LCD device to produce a first and second image wherein said LCD device has an inverted display for said second image.
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Specification