WO2003002957A3 - Methods and systems for measuring display attributes of a fed - Google Patents

Methods and systems for measuring display attributes of a fed Download PDF

Info

Publication number
WO2003002957A3
WO2003002957A3 PCT/US2002/020243 US0220243W WO03002957A3 WO 2003002957 A3 WO2003002957 A3 WO 2003002957A3 US 0220243 W US0220243 W US 0220243W WO 03002957 A3 WO03002957 A3 WO 03002957A3
Authority
WO
WIPO (PCT)
Prior art keywords
row
brightness
rows
fed
another embodiment
Prior art date
Application number
PCT/US2002/020243
Other languages
French (fr)
Other versions
WO2003002957A2 (en
Inventor
William Cummings
James C Dunphy
Ronald L Hansen
Jun Liu
Lee Cressi
Colin Stanners
Christopher J Spindt
Original Assignee
Candescent Tech Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Candescent Tech Corp filed Critical Candescent Tech Corp
Priority to EP02749666A priority Critical patent/EP1402506B1/en
Priority to KR1020037017053A priority patent/KR100879249B1/en
Priority to AU2002320162A priority patent/AU2002320162A1/en
Priority to AT02749666T priority patent/ATE467205T1/en
Priority to DE60236282T priority patent/DE60236282D1/en
Priority to JP2003508895A priority patent/JP4546080B2/en
Publication of WO2003002957A2 publication Critical patent/WO2003002957A2/en
Publication of WO2003002957A3 publication Critical patent/WO2003002957A3/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 using controlled light sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/42—Measurement or testing during manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data

Abstract

Method for compensating for brightness variations in a field emission device (100a). In one embodiment, a method and system are described for measuring the relative brightness of rows of a field emission display (FED) device (100a), storing information representing the measured brightness into a correction table and using the correction table to provide uniform row brightness in the display by adjusting row voltages and/or row on-time periods. A special measurement process is described for providing accurate current measurements on the rows. This embodiment compensates for brightness variations of the rows, e.g., for rows near the spacer walls (30). In another embodiment, a periodic signal, e.g., a high frequency noise signal (340), is added to the row on-time pulse in order to camouflage brightness variations in the rows near the spacer walls (30). In another embodiment, the area under the row on-time pulse is adjusted to provide row-by-row brightness compensation based on correction values stored in a memory resident correction table (60). In another embodiment, the brightness of each row is measured and compiled into a data profile for the FED. The data profile is used to control cathode burn-in processes so that brightness variations are corrected by physically altering the characteristics of the emitters of the rows.
PCT/US2002/020243 2001-06-28 2002-06-24 Methods and systems for measuring display attributes of a fed WO2003002957A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP02749666A EP1402506B1 (en) 2001-06-28 2002-06-24 Method and system for row-by-row brightness correction in an FED
KR1020037017053A KR100879249B1 (en) 2001-06-28 2002-06-24 Methods and systems for measuring display attributes of a fed
AU2002320162A AU2002320162A1 (en) 2001-06-28 2002-06-24 Methods and systems for measuring display attributes of a fed
AT02749666T ATE467205T1 (en) 2001-06-28 2002-06-24 METHOD AND DEVICE FOR LINE-BY-LINE BRIGHTNESS CORRECTION IN A FED
DE60236282T DE60236282D1 (en) 2001-06-28 2002-06-24 Method and device for line-by-line brightness correction in a FED
JP2003508895A JP4546080B2 (en) 2001-06-28 2002-06-24 Driving method of field emission display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/895,985 2001-06-28
US09/895,985 US6822628B2 (en) 2001-06-28 2001-06-28 Methods and systems for compensating row-to-row brightness variations of a field emission display

Publications (2)

Publication Number Publication Date
WO2003002957A2 WO2003002957A2 (en) 2003-01-09
WO2003002957A3 true WO2003002957A3 (en) 2003-05-01

Family

ID=25405412

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/020243 WO2003002957A2 (en) 2001-06-28 2002-06-24 Methods and systems for measuring display attributes of a fed

Country Status (10)

Country Link
US (2) US6822628B2 (en)
EP (2) EP1402506B1 (en)
JP (1) JP4546080B2 (en)
KR (2) KR100879249B1 (en)
AT (1) ATE467205T1 (en)
AU (1) AU2002320162A1 (en)
DE (1) DE60236282D1 (en)
MY (1) MY131950A (en)
TW (1) TW582008B (en)
WO (1) WO2003002957A2 (en)

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Also Published As

Publication number Publication date
KR20080075556A (en) 2008-08-18
JP4546080B2 (en) 2010-09-15
KR100906343B1 (en) 2009-07-06
US6822628B2 (en) 2004-11-23
DE60236282D1 (en) 2010-06-17
JP2004534968A (en) 2004-11-18
EP1402506A4 (en) 2007-06-06
AU2002320162A1 (en) 2003-03-03
ATE467205T1 (en) 2010-05-15
EP2131345A2 (en) 2009-12-09
EP2131345A3 (en) 2010-03-03
EP1402506B1 (en) 2010-05-05
TW582008B (en) 2004-04-01
EP1402506A2 (en) 2004-03-31
US7403175B1 (en) 2008-07-22
KR20040020062A (en) 2004-03-06
WO2003002957A2 (en) 2003-01-09
KR100879249B1 (en) 2009-01-16
US20030011537A1 (en) 2003-01-16
MY131950A (en) 2007-09-28

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