HK1052789A1 - Method and apparatus for driving a digital display by distributing pwm pulses over time - Google Patents

Method and apparatus for driving a digital display by distributing pwm pulses over time

Info

Publication number
HK1052789A1
HK1052789A1 HK03104704.6A HK03104704A HK1052789A1 HK 1052789 A1 HK1052789 A1 HK 1052789A1 HK 03104704 A HK03104704 A HK 03104704A HK 1052789 A1 HK1052789 A1 HK 1052789A1
Authority
HK
Hong Kong
Prior art keywords
signals
time period
lowest order
pulses
digital display
Prior art date
Application number
HK03104704.6A
Other versions
HK1052789B (en
Inventor
Ven Antony Van De
Original Assignee
Lighthouse Technologies Ltd
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 Lighthouse Technologies Ltd filed Critical Lighthouse Technologies Ltd
Publication of HK1052789A1 publication Critical patent/HK1052789A1/en
Publication of HK1052789B publication Critical patent/HK1052789B/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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes
    • 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
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of El Displays (AREA)
  • Liquid Crystal (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

This invention provides a method and apparatus to distribute pulses of a pulse width modulated signal over a time period. When applied to a digital display, the invention provides a signal representing the digital data comprising a plurality of smaller pulses distributed over the refresh time period to drive the display element. A logic circuit is provided to generate a plurality of combinable signals so that the incoming data can be combined with the signals to determine the mix of signals generated as a final output. The individual signals are generated by identifying the lowest order active bit of a counter that is subdividing the appropriate time period into smaller time divisions and generating a pulse on one of a plurality of outputs with each unique lowest order bit identified ouptut on a separate output and successive common lowest order bits identified generating pulses on the same output.
HK03104704.6A 2000-03-27 2003-07-02 Method and apparatus for driving a digital display by distributing pwm pulses over time HK1052789B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53552800A 2000-03-27 2000-03-27
PCT/IB2001/000477 WO2001073736A1 (en) 2000-03-27 2001-03-26 Method and apparatus for driving a digital display by distributing pwm pulses over time

Publications (2)

Publication Number Publication Date
HK1052789A1 true HK1052789A1 (en) 2003-09-26
HK1052789B HK1052789B (en) 2012-03-09

Family

ID=24134633

Family Applications (1)

Application Number Title Priority Date Filing Date
HK03104704.6A HK1052789B (en) 2000-03-27 2003-07-02 Method and apparatus for driving a digital display by distributing pwm pulses over time

Country Status (12)

Country Link
EP (1) EP1269455B1 (en)
JP (1) JP2003529100A (en)
KR (1) KR20020093011A (en)
CN (1) CN1272757C (en)
AT (1) ATE534984T1 (en)
AU (1) AU779338B2 (en)
CA (1) CA2403939C (en)
EA (1) EA005964B1 (en)
HK (1) HK1052789B (en)
MY (1) MY126157A (en)
TW (1) TW581999B (en)
WO (1) WO2001073736A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3923341B2 (en) 2002-03-06 2007-05-30 株式会社半導体エネルギー研究所 Semiconductor integrated circuit and driving method thereof
GB2403841B (en) * 2003-07-07 2006-08-09 Pelikon Ltd Control of Electroluminescent displays
JP4016942B2 (en) * 2003-12-10 2007-12-05 セイコーエプソン株式会社 PWM signal generation circuit and display driver
KR100718962B1 (en) * 2004-12-28 2007-05-16 엘지전자 주식회사 Projection Display Driving Apparatus
WO2012022235A1 (en) * 2010-08-19 2012-02-23 深圳市明微电子股份有限公司 Method and device for frequency multiplication of display control
US20200135128A1 (en) * 2017-05-08 2020-04-30 Compound Photonics Limited Drive techniques for modulation devices
CN112985325B (en) * 2021-04-21 2021-08-17 天津飞旋科技股份有限公司 Position decoding method and device of sine and cosine encoder and computer readable medium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03246592A (en) 1990-02-23 1991-11-01 Seiko Instr Inc Gradation display circuit of display device
JP3500899B2 (en) 1997-03-27 2004-02-23 三菱電機株式会社 Image display method and image display device

Also Published As

Publication number Publication date
MY126157A (en) 2006-09-29
EP1269455B1 (en) 2011-11-23
HK1052789B (en) 2012-03-09
KR20020093011A (en) 2002-12-12
EA005964B1 (en) 2005-08-25
CA2403939C (en) 2012-03-27
WO2001073736A1 (en) 2001-10-04
AU4268001A (en) 2001-10-08
EP1269455A1 (en) 2003-01-02
AU779338B2 (en) 2005-01-20
ATE534984T1 (en) 2011-12-15
TW581999B (en) 2004-04-01
CN1272757C (en) 2006-08-30
CN1421028A (en) 2003-05-28
EA200201021A1 (en) 2003-02-27
CA2403939A1 (en) 2001-10-04
JP2003529100A (en) 2003-09-30

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20200326