Method and device for avoiding image misinterpretation due to defective pixels in a matrix display

• US 8,537,144 B2
• Filed: 11/21/2003
• Issued: 09/17/2013
• Est. Priority Date: 11/29/2002
• Status: Active Grant

• Current Assignee: Barco NV
• Original Assignee: Barco NV
• Inventors: Matthijs, Paul, Kimpe, Tom
• Primary Examiner(s): SHERMAN, STEPHEN G
• Application Number:
  US10/719,881
• Publication Number:
  US 20040174320A1
• Time in Patent Office: 3,588 Days
• Field of Search: 345 76- 78, 345/55, 345/81, 345/83, 345 87- 88, 345 92- 94, 345/204, 345207-208, 345/690, 345697-699, 345/904
• US Class Current: 345/204
• CPC Class Codes: G09G 2330/10 Dealing with defective pixels
• CPC Class Codes: G09G 3/006 Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

The present invention relates to a system and a method for avoiding misinterpretation of images due to defective pixels present in matrix addressed electronic displays during display time. This may be very important e.g. in the medical world. The method comprises obtaining information on the presence of the defective pixels in the display, and modulating the operation of the display so as to indicate, emphasize or warn for the presence of said defective pixels on the actual display having defect pixels, or adapting the image content of the defective pixels or of pixels in the neighborhood of the defective pixels so as to indicate, emphasize or warn for the presence of said defective pixels in a copy of the displayed image. Such copy may be a hard copy or an electronic copy.

A corresponding device is also provided.

Claims

1. Method for avoiding misinterpretation of an image displayed on a matrix display device due to defective cells in the matrix display device, whereby the image comprises a plurality of pixels, the method comprising:

obtaining information on the presence and the location of the defective cells in said matrix display device, and

on the basis of this information,

modulating the operation of said matrix display device when displaying said image on said matrix display device and adapting in this way the image content of the pixels of said image, corresponding to said defective cells or corresponding to the pixels in the neighborhood of said defective cells so as to emphasize or warn for the presence of said defective cells on the actual display of said image.

2. Method according to claim 1, wherein the information is obtained from data previously stored in a memory device.

3. Method according to claim 2, comprising, while displaying the image on the matrix display device, supplying information on defective cells to a user, based on the stored data.

4. Method according to claim 1, wherein, emphasizing or warning for the presence of at least one defective cell comprises visually marking the at least one defective cell on said matrix display device.

5. Method according to claim 1, furthermore comprising shifting the displayed image so that defective cells are not located in a region of interest.

6. Method according to, claim 1, furthermore comprising shifting the displayed image so that a defective cell is located in a flat image area.

7. Method according to claim 1, wherein the information on the presence of defective cells is obtained by means of an image capturing device.

8. Method for avoiding misinterpretation of a copy of an image displayed on a matrix display device due to defective cells in the matrix display device, whereby the copy of the image comprises a plurality of pixels, the method comprising:

obtaining information on the presence and the location of the defective cells in said matrix display device, and

on the basis of this information,

adapting in said copy of said image, the image content of the pixels corresponding to said defective cells or of the pixels corresponding to the cells in the neighborhood of said defective cells so as to emphasize or warn for the presence of pixels corresponding to said defective cells, thereby avoiding misinterpretation of the copy of the image displayed on the matrix display device due to said defective cells.

9. Method according to claim 8, wherein, the copy is a hard copy or an electronic copy.

10. An apparatus for avoiding misinterpretation of an image displayed on a matrix display device due to defective cells in the matrix display device, whereby the image comprises a plurality of pixels, the device comprising:

an information retrieval device for obtaining information on the presence and the location of the defective cells in said matrix display device, and

a modulating device using this information

for modulating the operation of said matrix display device when displaying said image on said matrix display device and adapting in this way the image content of the pixels of said image, corresponding to said defective cells or corresponding to the pixels in the neighborhood of said defective cells so as to emphasize or warn for the presence of said defective cells on the actual display of said image.

11. An apparatus according to claim 10, wherein the information retrieval device comprises a memory device where defective cell information data is stored.

12. An apparatus according to claim 11, comprising an information supply device for supplying information on defective cells to a user, based on the stored data, while displaying the image on said matrix display device.

13. An apparatus according to claim 10, furthermore comprising marking means for visually marking the defective cells on said matrix display device.

14. An apparatus according to claim 10, furthermore, comprising a shifting device for shifting the displayed image so that defective cells are not located in a region of interest.

15. An apparatus according to claim 10, furthermore comprising a shifting device for shifting the displayed image so that a defective cell is located in a flat image area.

16. An apparatus for avoiding misinterpretation of a copy of an image displayed on a matrix display device due to defective cells in the matrix display device whereby the copy of the image comprises a plurality of pixels, the device comprising:

an information retrieval device for obtaining information on the presence and the location of the defective cells in said matrix display device and

a modulating device using this information

for adapting in said copy of said image, the image content of the pixels corresponding to said defective cells or of the pixels corresponding to the cells in the neighborhood of said defective cells so, as to emphasize or warn for the presence of pixels corresponding to said defective cells, thereby avoiding misinterpretation of the image displayed on the matrix display device due to said defective cells.

17. A control unit for use with an apparatus for avoiding misinterpretation of an image displayed on a matrix display device, due to defective cells in the matrix display device and whereby the image comprises a plurality of pixels, the control unit being adapted for controlling the obtaining of information on the presence, the location and characteristics of the defect cells in said matrix display device, and for controlling, on the basis of this information, modulation of the operation of said matrix display device when displaying said image on said matrix display device and adapting in this way the image content of the pixels of said image, corresponding to said defective cells or corresponding to the pixels in the neighborhood of said defective cells so as to emphasize or warn for the presence of said defective cells on the actual display of said image, or,

in a copy of said image, for adaption of the image content of the pixels corresponding to said defective cells or of the pixels corresponding to the cells in the neighborhood of said defective cells so, as to emphasize or warn for the presence in the copy of said image of pixels corresponding to said defective cells, thereby avoiding misinterpretation of the image displayed on the matrix display device, due to said defective cells.