EP2156432A1 - Circuit arrangement and actuation method for semi-conductor light sources - Google Patents
Circuit arrangement and actuation method for semi-conductor light sourcesInfo
- Publication number
- EP2156432A1 EP2156432A1 EP07730106A EP07730106A EP2156432A1 EP 2156432 A1 EP2156432 A1 EP 2156432A1 EP 07730106 A EP07730106 A EP 07730106A EP 07730106 A EP07730106 A EP 07730106A EP 2156432 A1 EP2156432 A1 EP 2156432A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- analog
- digital
- circuit arrangement
- light sources
- semiconductor light
- 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.)
- Ceased
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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/327—Burst dimming
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0237—Switching ON and OFF the backlight within one frame
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0653—Controlling or limiting the speed of brightness adjustment of the illumination source
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- the invention relates to projection devices equipped with semiconductor light sources.
- microdisplay applications for front and rear projection should be mentioned.
- High-performance semiconductor light sources such as high-performance LEDs have recently been increasingly used in applications previously reserved for high-pressure discharge lamps. Especially in the projection area, the semiconductor light sources are not driven continuously, but operated pulsed to meet the local requirements. It works with very short pulses, which have a very high power density.
- Display applications use multiple, usually at least 3 colors.
- the control circuit is divided into a video electronics, working up the etcssig ⁇ nal, and a driver electronics, which is often split into a digital and an analog portion that are connected via a digital / analog converter.
- the video electronics provide instructions to the driver electronics to turn on a particular color according to the input signal.
- a process is triggered in the digital part of the driver electronics, which after a certain time results in the output of a brightness value for the desired color.
- This Hellig value and timing are in a table generated by the video electronics.
- the digital driver electronics reads this table at the request of the video electronics, the so-called strobe, and generates a setpoint signal on the basis of the values read out.
- the analog driving section turns on the entspre ⁇ sponding colored semiconductor light source with the desired brightness. Since display applications, the colors are successively projected, the colored HaIb- have to be shut conductor light sources after the output pulse again for the next color projected who can ⁇ . This requires a further passage in the digital driver electronics. A zero value must be entered into the buffer memory of the analog / digital converter and this then output as an analog value, whereupon the analog part switches off the semiconductor light source again.
- the invention is based on the fact that the semiconductor light source is always switched off after the pulse-shaped light output. This makes it possible to enter in the analog / digital converter only once a new value and the semiconductor light source via a switch on and off. This has the advantage that slow components can be used without restricting the performance of the overall arrangement.
- FIG. 1 Block diagram of a circuit arrangement according to the prior art.
- FIG. 2 Block diagram of a circuit arrangement according to the invention.
- Fig. 3 Comparison of some relevant waveforms of the prior art and the present invention.
- the block diagram of a prior art circuit arrangement is shown in FIG.
- the digital part of a drive electronics 1 contains a timing signal decoding logic 13, and a control logic 11 for the digital / analog converter 7.
- the analog part consists of a digital / analog converter 7, a control logic 3 and the light emitting diode modules 5.
- Die emitting diode modules 5 consist of the power drivers for the LEDs and the LEDs themselves.
- the analog Hellig ⁇ keitssignal is input to the power driver that turns on the LEDs on the desired brightness level, or nalogsignal at a A-, that logic 0 corresponds off.
- the timing signal decoding logic receives the strobe timing signal from the video electronics (not shown).
- Timingsignaldekodierlogik outputs a start signal to the control logic 11 from.
- This logic reads a table generated by the video electronics and stores timing and brightness values for the various phases of an image. The following procedure is best seen in Fig. 3. In the upper third of the timing signals generated by the video electronics are shown, in the middle third of the actions and signals of a circuit arrangement according to the prior art.
- Block 21 stands for the reading of the table. This begins at time Ti as soon as the timing signal logical is 1. As soon as the values from the table have been determined, they are written to the buffer memory of the digital / analogue converter (block 23). In block 25, as soon as the buffer memory has been completely updated, the digital / analogue converter is put into action so that a digital signal corresponding to the analog value is applied to the analogue output. For all this requires the dri ⁇ bersctreu the time t L oGi- Once the analog signal is given from ⁇ switches the analog part of a tungmaschineerschal- the LED modules. 5 This process requires the
- the timing signal is again lo ⁇ gisch 0.
- the entire procedure is run through again to reset the analog value to 0 and turn off the LED module so.
- the time between the times Ti and T 3 is equal to the timing signal duration t S ⁇ B-
- the processing time t L oGi is significantly responsible for the minimum pulse duration of the entire arrangement, because if the duration of the processing time t L oGi in the vicinity of the minimum timing signal ⁇ ts ⁇ B, min reaches the timing can no longer be met.
- the minimum pulse length and thus the minimum timing signal duration t S ⁇ B, so min depends directly on the proces ⁇ processing speed of the driver circuit from.
- the signal 51 describes the output of the digital / analogue converter. This will be switched as soon as the digital processing is completed. This takes the time t L0 G2 / - which is greater than the time t L0 Gi • As soon as the analog / digital converter has switched safely, the switch S x of the corresponding color is turned on (signal ⁇ 53). The power driver thus receives the analog signal 51 from the digital / analog converter and switches on the LEDs (signals 55, 57).
- the analog / digital converter only works for the adjustment of the brightness, the Ver ⁇ processing time is much less critical.
- the analog / digital converter only works in front of the pulse means the delay time of the converter plays no role for the minimum pulse length.
- the invention has Ge ⁇ contrary, the great advantage of being able to realize very short minimum Pulslän ⁇ gen, there must be no processing during the pulse practically, but the bulk of the processing can take place during the pulse intervals. Since the longer processing time can be easily compensated before the pulse of the video electronics, the driving method according to the invention has no disadvantages even at slower working components.
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)
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2007/055792 WO2008151664A1 (en) | 2007-06-13 | 2007-06-13 | Circuit arrangement and actuation method for semi-conductor light sources |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2156432A1 true EP2156432A1 (en) | 2010-02-24 |
Family
ID=38935905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07730106A Ceased EP2156432A1 (en) | 2007-06-13 | 2007-06-13 | Circuit arrangement and actuation method for semi-conductor light sources |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100171773A1 (en) |
EP (1) | EP2156432A1 (en) |
JP (1) | JP2010531052A (en) |
KR (1) | KR20100021518A (en) |
CN (1) | CN101681596A (en) |
TW (1) | TW200906211A (en) |
WO (1) | WO2008151664A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112566320B (en) * | 2020-12-22 | 2023-02-10 | 安徽亮亮电子科技有限公司 | Method for realizing high power factor and low stroboflash |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2713893B2 (en) * | 1986-11-10 | 1998-02-16 | 株式会社東芝 | Flat panel display |
JPH11233828A (en) * | 1998-02-10 | 1999-08-27 | Fuji Xerox Co Ltd | Light emitting element driving circuit and its driving method |
JPH11344956A (en) * | 1998-03-31 | 1999-12-14 | Sony Corp | Picture display device |
WO2000036583A2 (en) * | 1998-12-14 | 2000-06-22 | Kopin Corporation | Portable microdisplay system |
US6594606B2 (en) * | 2001-05-09 | 2003-07-15 | Clare Micronix Integrated Systems, Inc. | Matrix element voltage sensing for precharge |
US6963321B2 (en) * | 2001-05-09 | 2005-11-08 | Clare Micronix Integrated Systems, Inc. | Method of providing pulse amplitude modulation for OLED display drivers |
WO2003034385A2 (en) * | 2001-10-19 | 2003-04-24 | Clare Micronix Integrated Systems, Inc. | System and method for illumination timing compensation in response to row resistance |
US7088059B2 (en) * | 2004-07-21 | 2006-08-08 | Boca Flasher | Modulated control circuit and method for current-limited dimming and color mixing of display and illumination systems |
JP4544068B2 (en) * | 2005-07-14 | 2010-09-15 | ソニー株式会社 | Light emitting diode element drive circuit, light source device, display device |
JP4577525B2 (en) * | 2007-05-31 | 2010-11-10 | 東芝ライテック株式会社 | Lighting device |
-
2007
- 2007-06-13 WO PCT/EP2007/055792 patent/WO2008151664A1/en active Application Filing
- 2007-06-13 KR KR1020107000704A patent/KR20100021518A/en not_active Application Discontinuation
- 2007-06-13 EP EP07730106A patent/EP2156432A1/en not_active Ceased
- 2007-06-13 CN CN200780053310A patent/CN101681596A/en active Pending
- 2007-06-13 US US12/663,012 patent/US20100171773A1/en not_active Abandoned
- 2007-06-13 JP JP2010511498A patent/JP2010531052A/en active Pending
-
2008
- 2008-06-10 TW TW097121512A patent/TW200906211A/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2008151664A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20100171773A1 (en) | 2010-07-08 |
WO2008151664A1 (en) | 2008-12-18 |
KR20100021518A (en) | 2010-02-24 |
TW200906211A (en) | 2009-02-01 |
JP2010531052A (en) | 2010-09-16 |
CN101681596A (en) | 2010-03-24 |
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Effective date: 20120506 |