WO2002012844A1 - Schaltung mit kombiniertem signal- und umgebungslichtsensor - Google Patents
Schaltung mit kombiniertem signal- und umgebungslichtsensor Download PDFInfo
- Publication number
- WO2002012844A1 WO2002012844A1 PCT/EP2001/008795 EP0108795W WO0212844A1 WO 2002012844 A1 WO2002012844 A1 WO 2002012844A1 EP 0108795 W EP0108795 W EP 0108795W WO 0212844 A1 WO0212844 A1 WO 0212844A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- sensor
- output
- signal
- ambient brightness
- Prior art date
Links
- 230000007613 environmental effect Effects 0.000 title abstract 2
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/28—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source
- G01J1/30—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors
- G01J1/32—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors adapted for automatic variation of the measured or reference value
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
- H04N21/42202—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS] environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
- H04N5/58—Control of contrast or brightness in dependence upon ambient light
Definitions
- the invention relates to a circuit for evaluating optical signals. It is based in particular on a circuit according to the preamble of claim 1.
- the readability of the display or the quality of display of images can vary considerably with the brightness of the ambient light.
- the user With changing lighting conditions, the user generally has the option of adapting certain operating parameters of the device, such as brightness or contrast, to the lighting conditions in the vicinity of the device.
- certain devices already have an automatic adjustment of certain operating parameters to the brightness of the ambient light.
- the detection of the ambient brightness which is necessary for automatic adaptation, is usually based on an optical sensor which is mounted in the housing of the device, generally pointing in the direction of the viewer.
- the signal provided by the ambient light sensor is fed to a control system which automatically adjusts the operating parameters to the ambient brightness.
- the use of such an automatic adjustment is suitable, inter alia, in televisions, video projection devices, dashboard lights or devices with liquid crystal displays such as portable computers or mobile telephones.
- the method described above for adapting the operating parameters of a display or projection device to the ambient brightness is already used in commercially available devices, it is currently only used in a few, mostly high-quality devices.
- the sensor required for measuring the ambient brightness causes relatively high additional product costs, which are due on the one hand to the costs for the component itself, and on the other hand to the precautions which to install the sensor in the device housing.
- the optical sensor can impose restrictions on the design of the device housing, which under certain circumstances cannot be reconciled with miniaturization or a special artistic design of the housing.
- the invention described in claim 1 proposes such a circuit.
- the sensor that is present in many devices for receiving control or data signals is used at the same time to determine the ambient brightness.
- the sensor mentioned is usually attached in the direction of the user and thus has an optimal position for determining the ambient brightness.
- the spectral range in which (infrared) sensors currently used are sensitive to control or data signals also covers the visible part of the spectral range. Since the infrared component contained in the ambient light is proportional to the intensity of the visible light, it is ensured that the ambient light can be detected as well as by a separate sensor.
- the separation of ambient brightness and control or data signals is technically possible in that the ambient light produces a substantially constant and thus only a slowly changing signal at the optical sensor, while control and data signals are characterized by rapid, pulse-like changes, for example in the case of Infrared receivers LTM-9237-33 from Liton are in the order of 30 kHz.
- control or data signals and ambient brightness can thus be attributed to the separation of quickly and slowly changing signal components.
- the simultaneous use of the optical sensor for control or data signals as a sensor for the ambient brightness means that an additional optical sensor, as is currently required in regulations, and the associated measures such as cutouts in the housing, cable feeds, etc., can be omitted. This allows the detection of the invention
- FIG. 1 shows a first exemplary embodiment of the invention
- Figure 2 shows a second embodiment of the invention and Figure 3 shows a third embodiment of the invention.
- FIG. 1 shows a possible embodiment of a control circuit according to the invention using the example of an infrared (IR) sensor for receiving control signals from an infrared remote control.
- the circuit diagram schematically shows an IR diode 10, which is connected via a resistor 11 to a voltage source 12 with the voltage U is operated.
- the voltage signal falling at the IR diode is used on the one hand via a low-pass filter 13, 14 at an output 17 for regulating the operating parameters such as brightness or contrast, and on the other hand via a capacitor 15 and downstream operational amplifier 16 at the output 18 for signal decoder
- the rapidly changing signal components which can pass through the capacitor 15 before the operational amplifier, but are blocked by the low pass 13, 14, are separated from the substantially constant signal components, which in turn are blocked by the capacitor and passed through by the low pass ,
- the latter are proportional to the ambient brightness and can be fed to a control system which, depending on the brightness of the ambient light, approximately the contrast of the Image.
- the circuit described does not take into account the fact that the voltage at the IR diode 10 may collapse under high ambient brightness.
- FIG. 2 schematically shows a further exemplary embodiment of a control circuit according to the invention which avoids this problem.
- two transistors 21, 22 are provided, the bases of which are connected to the output of the operational amplifier 26 via a low-pass filter 23, 24.
- the transistor 21 the current through the infrared receiving diode 20 is readjusted in accordance with the ambient brightness in such a way that the voltage across the diode remains virtually unchanged and a breakdown of the voltage with a high ambient brightness is impossible.
- FIG. 3 shows a further advantageous embodiment of the invention, which is based on the combination of a current mirror consisting of the transistors 31, 32 with commercially available IR receiving modules 30.
- the circuit is suitable for receiving modules whose current consumption is essentially determined by the current consumption of the receiving diode and thus by the ambient brightness.
- the current consumed by the receiving module only needs to be copied by a current mirror circuit 31, 32 and filtered by means of a low pass 33, 34.
- the ambient brightness can then be obtained at output 17 from the change in the offset value compared to the basic current consumption in the dark.
- the circuit thus has the advantage that commercially available IR receiver modules (e.g. LTM-9237-33 from Liton), as are currently used as standard in mass production of consumer electronics, can be used unchanged.
- the last-mentioned embodiment in particular shows that the invention enables detection to be carried out with extremely little additional technical effort. It should also be noted that the invention can easily be transferred to other areas by a person skilled in the art. At this point, only a few other examples are mentioned, such as mobile phones with an IR interface, in which the display brightness is to be regulated in dependence on the ambient brightness, IR receivers in the motor vehicle sector for opening and closing the vehicle, in which the interior lighting or the display elements are simultaneously illuminated to be regulated, or a slide or video projector, the lamp power of which is to be excited depending on the ambient light.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Television Receiver Circuits (AREA)
- Projection Apparatus (AREA)
- Controls And Circuits For Display Device (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/343,361 US7133079B2 (en) | 2000-08-04 | 2001-07-30 | Circuit comprising a combined signal and environmental light sensor |
AU2001279792A AU2001279792A1 (en) | 2000-08-04 | 2001-07-30 | Circuit comprising a combined signal and environmental light sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10038064A DE10038064B4 (de) | 2000-08-04 | 2000-08-04 | Schaltung mit kombiniertem Signal- und Umgebungslichtsensor |
DE10038064.8 | 2000-08-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002012844A1 true WO2002012844A1 (de) | 2002-02-14 |
Family
ID=7651318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/008795 WO2002012844A1 (de) | 2000-08-04 | 2001-07-30 | Schaltung mit kombiniertem signal- und umgebungslichtsensor |
Country Status (4)
Country | Link |
---|---|
US (1) | US7133079B2 (de) |
AU (1) | AU2001279792A1 (de) |
DE (1) | DE10038064B4 (de) |
WO (1) | WO2002012844A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1710780A1 (de) * | 2005-04-07 | 2006-10-11 | Tatung Co., Ltd. | Verfahren zur Helligkeitsregelung einer Anzeigevorrichtung |
DE602006006967D1 (de) | 2006-02-24 | 2009-07-09 | Vestel Elekt Sanayi Ve Ticaret | Vorrichtung und Verfahren zur Einstellung der Bildeigenschaften auf einer Anzeigevorrichtung |
EP2546620B1 (de) * | 2011-07-13 | 2014-04-09 | ELMOS Semiconductor AG | Vorrichtung zur Umgebungslichtkompensation für gleichermaßen Nutzlicht und Umgebungslicht ausgesetzten optischen Sensoren |
US10367950B2 (en) * | 2014-06-11 | 2019-07-30 | Lenovo (Singapore) Pte. Ltd. | Device notification adjustment dependent on user proximity |
TWI718208B (zh) * | 2016-06-30 | 2021-02-11 | 日商半導體能源研究所股份有限公司 | 顯示裝置及其工作方法以及電子裝置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994018790A1 (de) * | 1993-02-05 | 1994-08-18 | Barath, Ludwig | Umgebungsabhängige automatische leuchtdichtesteuerung für bildschirme |
US5406305A (en) * | 1993-01-19 | 1995-04-11 | Matsushita Electric Industrial Co., Ltd. | Display device |
EP0710017A2 (de) * | 1994-10-28 | 1996-05-01 | Plessey Semiconductors Limited | Fernsehempfänger mit einer Schnittstelle zum Darstellen und Übertragen von Daten |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3607767C1 (de) * | 1986-03-08 | 1987-04-02 | Wolf Gmbh Richard | Videoendoskop |
US5164714A (en) * | 1988-06-20 | 1992-11-17 | Amp Incorporated | Modulated touch entry system and method with synchronous detection |
US5055667A (en) * | 1990-06-21 | 1991-10-08 | Loral Fairchild Corporation | Non-linear photosite response in CCD imagers |
US5286969A (en) * | 1993-01-28 | 1994-02-15 | At&T Bell Laboratories | Apparatus for measuring optical power in an optical receiver with a non-linear element and a transconductance amplifier |
US5868666A (en) * | 1993-11-26 | 1999-02-09 | Olympus Optical Co., Ltd. | Endoscope apparatus using programmable integrated circuit to constitute internal structure thereof |
US5786801A (en) * | 1996-09-06 | 1998-07-28 | Sony Corporation | Back light control apparatus and method for a flat display system |
US6234957B1 (en) * | 1998-02-09 | 2001-05-22 | Fuji Photo Optical Co., Ltd. | Electronic endoscope system capable of enhancing luminance |
US6334845B1 (en) * | 1998-03-25 | 2002-01-01 | Fuji Photo Optical Co., Ltd. | Electronic-endoscope light source unit for setting shading period |
US6176429B1 (en) * | 1998-07-17 | 2001-01-23 | Psc Scanning, Inc. | Optical reader with selectable processing characteristics for reading data in multiple formats |
DE19834122B4 (de) * | 1998-07-29 | 2007-05-31 | Insta Elektro Gmbh | Vorrichtung zur Parametrierung fertigungsbezogener Stellgrößen mittels drahtloser aktiv-infraroter Fernübertragung für Bewegungsmelder |
US6297859B1 (en) * | 1999-06-30 | 2001-10-02 | Thomson Licensing S.A. | Opto sensor signal detector |
US6522078B1 (en) * | 1999-08-27 | 2003-02-18 | Horiba, Ltd. | Remotely controlled power supply switching system |
-
2000
- 2000-08-04 DE DE10038064A patent/DE10038064B4/de not_active Expired - Lifetime
-
2001
- 2001-07-30 US US10/343,361 patent/US7133079B2/en not_active Expired - Lifetime
- 2001-07-30 AU AU2001279792A patent/AU2001279792A1/en not_active Abandoned
- 2001-07-30 WO PCT/EP2001/008795 patent/WO2002012844A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5406305A (en) * | 1993-01-19 | 1995-04-11 | Matsushita Electric Industrial Co., Ltd. | Display device |
WO1994018790A1 (de) * | 1993-02-05 | 1994-08-18 | Barath, Ludwig | Umgebungsabhängige automatische leuchtdichtesteuerung für bildschirme |
EP0710017A2 (de) * | 1994-10-28 | 1996-05-01 | Plessey Semiconductors Limited | Fernsehempfänger mit einer Schnittstelle zum Darstellen und Übertragen von Daten |
Also Published As
Publication number | Publication date |
---|---|
US7133079B2 (en) | 2006-11-07 |
DE10038064B4 (de) | 2005-02-03 |
AU2001279792A1 (en) | 2002-02-18 |
US20040012719A1 (en) | 2004-01-22 |
DE10038064A1 (de) | 2002-02-14 |
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