CA2403939A1 - 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 Download PDFInfo
- Publication number
- CA2403939A1 CA2403939A1 CA002403939A CA2403939A CA2403939A1 CA 2403939 A1 CA2403939 A1 CA 2403939A1 CA 002403939 A CA002403939 A CA 002403939A CA 2403939 A CA2403939 A CA 2403939A CA 2403939 A1 CA2403939 A1 CA 2403939A1
- Authority
- CA
- Canada
- Prior art keywords
- time period
- signals
- digital display
- over
- pulsed signals
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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.
Claims (16)
1. A method of driving a digital display by distributing a pulse width modulated signal over a time period comprising the steps of:
- generating a plurality of pulsed signals over the time period "T";
- each of said plurality of pulsed signals providing at least one individual pulse over the time period "T";
- each pulse of the plurality of pulsed signals being generated over a discreet time interval within the period "T" with respect to any other pulse within any of said plurality of pulsed signals; and - combining said pulsed signals in accordance with the data to generate an output signal containing distributed pulses which, in summation, represent the portion of the time period "T" intended by the incoming data.
- generating a plurality of pulsed signals over the time period "T";
- each of said plurality of pulsed signals providing at least one individual pulse over the time period "T";
- each pulse of the plurality of pulsed signals being generated over a discreet time interval within the period "T" with respect to any other pulse within any of said plurality of pulsed signals; and - combining said pulsed signals in accordance with the data to generate an output signal containing distributed pulses which, in summation, represent the portion of the time period "T" intended by the incoming data.
2. A method of driving a digital display by distributing a pulse width modulated signal over a time period as claimed in claim 1 wherein the number of said plurality of pulsed signals equals the number of binary digits necessary to represent the highest number of said data.
3. A method of driving a digital display by distributing a pulse width modulated signal over a time period as claimed in claim 1 wherein said plurality of pulsed signals include signals containing pulses over substantially 1/2n T of the time period "T" where n = 1, 2, 3 etc. and the maximum n equals the order of the number of discreet time intervals into which the period "T" is subdivided.
4. A method of driving a digital display by distributing a pulse width modulated signal over a time period as claimed in claim 1 wherein said combining said pulsed signals with data comprises selecting said pulsed signals by utilizing said data and then combining selected signals into a single trying signal.
5. A method of driving a digital display by distributing a pulse width modulated signal over a time period as claimed in claim 4 wherein said selection is performed by matching an active bit in an incoming binary data value with a pulsed signal to select that signal for combination.
6. An apparatus to drive a digital display by distributing a pulse width modulated signal over a time period "T" comprising:
- at least one signal generator to generate a plurality of pulsed signals wherein each of said signals comprises a distribution of individual pulses with each of said individual pulses being provided over a discreet time period within the overall period "T" with respect to the individual pulses of all the pulsed signals;
- AND connection means to combine bits of an incoming data signal with said plurality of pulsed signals to select which of said pulsed signals should be combined to represent the incoming data signal; and - OR connection means to combine said plurality of selected signals into a single series of distributed pulses over the time period "T"
representing the incoming data.
- at least one signal generator to generate a plurality of pulsed signals wherein each of said signals comprises a distribution of individual pulses with each of said individual pulses being provided over a discreet time period within the overall period "T" with respect to the individual pulses of all the pulsed signals;
- AND connection means to combine bits of an incoming data signal with said plurality of pulsed signals to select which of said pulsed signals should be combined to represent the incoming data signal; and - OR connection means to combine said plurality of selected signals into a single series of distributed pulses over the time period "T"
representing the incoming data.
7. An apparatus to drive a digital display by distributing a pulse width modulated signal over a time period "T" as claimed in claim 6 wherein said plurality of pulsed signals comprises a pulsed signal for each binary bit of said incoming data signal.
8. An apparatus to drive a digital display by distributing a pulse width modulated signal over a time period "T" as claimed in claim 6 wherein said plurality of pulsed signals include signals containing pulses over substantially 1/2n T of the time period "T" where n = 1, 2, 3 etc. until n equals the binary order of the number of discreet time periods into which the overall period "T" is subdivided.
9. An apparatus to drive a digital display by distributing a pulse width modulated signal over a time period "T" as claimed in claim 6 wherein said signal generator includes a clock-driven counter to generate a sequence of binary numbers designating subdivisions of the period "T", an encoder to identify the lowest active bit of said counter and generate a sequence of signals, one for each time division, identifying the lowest active bit and a decoder to generate an output pulse on a discreet output for each unique lowest active bit and a subsequent pulse on the same output for each common lowest active bit identified.
10. A method of driving a digital display by generating a plurality of time discreet pulsed signals suitable for subsequent combination comprising:
- generating a succession of binary numbers subdividing a desired time period;
- identifying the order of the lowest active bit of the succession of binary numbers generated to output a sequence of numbers, each for a single time period subdivision, identifying the lowest order bit; and - generating an output pulse on one of a plurality of combinable outputs with an individual pulse being generated for each subdivision of the time period and pulses generated by common lowest order bit identifiers being generated on a common output.
- generating a succession of binary numbers subdividing a desired time period;
- identifying the order of the lowest active bit of the succession of binary numbers generated to output a sequence of numbers, each for a single time period subdivision, identifying the lowest order bit; and - generating an output pulse on one of a plurality of combinable outputs with an individual pulse being generated for each subdivision of the time period and pulses generated by common lowest order bit identifiers being generated on a common output.
11. A method of driving a digital display by generating a plurality of time discreet pulsed signals suitable for subsequent combination as claimed in claim 10 wherein said output pulses are generated on a unique output for each unique lowest order bit identified.
12. An apparatus for driving a digital display by the generation of a plurality of combinable pulsed signals over a time period comprising:
- a counter to generate a sequence of binary numbers to subdivide the time period;
- a lowest order bit identifier to identify the lowest active bit in the binary sequence output from the counter and output a succession of signals representing the lowest active bit, one such signal for each of said time division; and a pulse generator to activate a pulse on a discreet output for each unique lowest order bit identified and successive pulses for common lowest order bits to be generated on a common output.
- a counter to generate a sequence of binary numbers to subdivide the time period;
- a lowest order bit identifier to identify the lowest active bit in the binary sequence output from the counter and output a succession of signals representing the lowest active bit, one such signal for each of said time division; and a pulse generator to activate a pulse on a discreet output for each unique lowest order bit identified and successive pulses for common lowest order bits to be generated on a common output.
13. An apparatus for driving a digital display by generation of a plurality of combinable pulsed signals over a time period as claimed in claim 12 wherein said lowest order bit identifier comprises a priority encoder connected to said counter such that the highest order input of said encoder is connected to the lowest order output of said counter.
14. An apparatus for driving a digital display by generation of a plurality of combinable pulsed signals over a time period as claimed in claim 13 wherein said pulse generator includes a decoder to receive signals from said priority encoder.
15. An apparatus for driving a digital display by generation of a plurality of combinable pulsed signals over a time period as claimed in claim 12 wherein said counter is driven to generate said sequence of binary numbers and subdivide the time period by a clock.
16. An apparatus for driving a digital display by generation of a plurality of combinable pulsed signals over a time period as claimed in claim 12 wherein said plurality of combinable signals comprises n signals where n is the order of the binary number representing the number of time subdivisions from the counter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53552800A | 2000-03-27 | 2000-03-27 | |
| US09/535,528 | 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 |
|---|---|
| CA2403939A1 true CA2403939A1 (en) | 2001-10-04 |
| CA2403939C CA2403939C (en) | 2012-03-27 |
Family
ID=24134633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2403939A Expired - Lifetime CA2403939C (en) | 2000-03-27 | 2001-03-26 | 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)
| 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)
| 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 |
-
2001
- 2001-03-26 WO PCT/IB2001/000477 patent/WO2001073736A1/en active IP Right Grant
- 2001-03-26 CA CA2403939A patent/CA2403939C/en not_active Expired - Lifetime
- 2001-03-26 KR KR1020027012890A patent/KR20020093011A/en not_active Application Discontinuation
- 2001-03-26 AT AT01915598T patent/ATE534984T1/en active
- 2001-03-26 AU AU42680/01A patent/AU779338B2/en not_active Ceased
- 2001-03-26 EA EA200201021A patent/EA005964B1/en not_active IP Right Cessation
- 2001-03-26 JP JP2001571376A patent/JP2003529100A/en active Pending
- 2001-03-26 CN CNB01807359XA patent/CN1272757C/en not_active Expired - Lifetime
- 2001-03-26 EP EP01915598A patent/EP1269455B1/en not_active Expired - Lifetime
- 2001-03-27 TW TW090107242A patent/TW581999B/en not_active IP Right Cessation
- 2001-03-27 MY MYPI20011399A patent/MY126157A/en unknown
-
2003
- 2003-07-02 HK HK03104704.6A patent/HK1052789B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| MY126157A (en) | 2006-09-29 |
| HK1052789A1 (en) | 2003-09-26 |
| 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 |
| JP2003529100A (en) | 2003-09-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20210326 |