EP1798716A1 - Systèmes pour contrôler la luminosité d'images affichées - Google Patents

Systèmes pour contrôler la luminosité d'images affichées Download PDF

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Publication number
EP1798716A1
EP1798716A1 EP05112302A EP05112302A EP1798716A1 EP 1798716 A1 EP1798716 A1 EP 1798716A1 EP 05112302 A EP05112302 A EP 05112302A EP 05112302 A EP05112302 A EP 05112302A EP 1798716 A1 EP1798716 A1 EP 1798716A1
Authority
EP
European Patent Office
Prior art keywords
brightness
period
during
output terminal
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.)
Withdrawn
Application number
EP05112302A
Other languages
German (de)
English (en)
Inventor
Du-Zen Peng
Shih-Chang Chang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TPO Displays Corp
Original Assignee
Toppoly Optoelectronics 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 Toppoly Optoelectronics Corp filed Critical Toppoly Optoelectronics Corp
Priority to EP05112302A priority Critical patent/EP1798716A1/fr
Publication of EP1798716A1 publication Critical patent/EP1798716A1/fr
Withdrawn legal-status Critical Current

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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
    • G09G3/30—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 using electroluminescent panels
    • G09G3/32—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 using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • 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
    • 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]
    • H05B45/10—Controlling the intensity 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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • 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
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display 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
    • 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
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

Definitions

  • the disclosure relates to image display.
  • Display panels of mobile electronic systems are typically user adjustable to compensate for varying levels of environmental brightness. For example, a display panel should be able to generate high brightness to display an image in a bright environment. Conversely, the display of a dark image in a darker environment requires less display panel brightness.
  • a conventional method controls brightness of light emitted from a display panel according to voltage generated by a voltage divider.
  • Fig. 1 is a schematic diagram of a conventional voltage divider. A voltage between two resistors can be adjusted according to the resistance of two resistors. A first maximum gray level provided by voltage divider 10 is 100nits, a second maximum gray level provided by voltage divider 12 is 150nits, and a third maximum gray level provided by voltage divider 14 is 200nits. Therefore, the brightness of light emitted from the display panel can be adjusted by providing different maximum gray levels. Unfortunately, since such a conventional method utilizes numerous voltage dividers to generate multiple voltages for adjusting the brightness of light emitted from the display panel, the cost and size of the display panel can be high.
  • a representative embodiment of such a system comprises a signal generator that comprises a control unit, a first processing unit, and a storage unit.
  • the control unit outputs a reference voltage according to the brightness of light emitted from the lamp during a first period and outputs a reference signal during a second period.
  • the first processing unit comprises a first input terminal and a first output terminal. Voltage of the first input terminal is equal to that of the first output terminal during the first period. A logic level of the first output terminal is inverse to a logic level of the first input terminal.
  • the storage unit stores a response voltage according to the reference voltage and the voltage of the first input terminal during the first period and controls the logic level of the first input terminal according to the reference voltage and the response voltage during the second period.
  • Another embodiment of such a system comprises a control unit that is operative to adjust brightness of a corresponding display panel based upon at least one of: detected brightness of ambient light and brightness of light emitting elements of the display panel.
  • Signal generator 24 comprises a control unit 32, a first processing unit 34, and a storage unit 36 connected therebetween.
  • control unit 32 outputs a reference voltage Vref according to brightness emitted from light-emitting element 30.
  • control unit 32 outputs a reference signal Sp.
  • Control unit 32 comprises a photo-detection device 322 and selection device 324.
  • Photo-detection device 322 provides reference voltage Vref according to the brightness of light emitted from lamp 30.
  • Selection device 324 outputs reference voltage Vref or reference signal Sp according to a control signal Sc (not shown).
  • the logic level of control signal Sc is high during the first period and that of control signal Sc is low during the second period.
  • selection device 324 outputs reference voltage Vref during the first period and otuputs reference signal Sp during the second period.
  • reference signal Sp is a triangular signal provided from external.
  • the first processing unit 34 comprises an input terminal P1 and an output terminal P2.
  • a voltage of the input terminal P1 is equal to that of the output terminal P2 during the first period.
  • a logic level of the output terminal P2 is inverse to a logic level of the input terminal P1 during the second period.
  • Storage unit 36 stores a response voltage Vc according to reference voltage Vref and the voltage of the input terminal P1 during the first period. Additionally, storage unit 36 controls the logic level of the input terminal P1 according to reference voltage Vref and the response voltage Vc during the second period. The output terminal P2 provides preset signal STV according the logic level of the input terminal P1 during the second period.
  • storage unit 36 is a capacitor.
  • Fig. 2b is a schematic diagram of the embodiment of the system for controlling brightness of displayed images of Fig. 2a showing the signal generator 24 in greater detail.
  • photo-detection device 322 comprises a photo-sensor 411 and a converter 412 and provides reference voltage Vref according to brightness of light emitted from light-emitting element 30.
  • Photo-sensor 411 detects the brightness of light emitted from light-emitting element 30 and provides a corresponding current Iref.
  • Converter 412 converts the current Iref to reference voltage Vref. Since a value of the current Iref is small, a current mirror unit (not shown) is utilized to amplify the current Iref.
  • Converter 412 receives the amplified current Iref.
  • Selection device 324 comprises transistors 413 and 414.
  • Transistor 413 is a P-type transistor and transistor 414 is an N-type transistor.
  • a source of transistor 413 receives reference signal Sp, a gate thereof receives a control signal Sc, and a drain thereof is coupled to a drain of transistor 414.
  • a gate of transistor 414 receives the control signal Sc and a source thereof receives reference voltage Vref.
  • control signal Sc As the control signal Sc is at high logic level during the first period, transistor 414 is turned on. Therefore, voltage of a node P3 is approximately equal to reference voltage Vref. As the control signal Sc is at low logic level during the second period, transistor 413 is turned on. Therefore, voltage of a node P3 is approximately equal to voltage of reference signal Sp.
  • the first processing unit 34 comprises a switching device 342 and an inverting device 344 connected in parallel with switching device 342.
  • switching device 342 is turned on such that a voltage of an input terminal P4 of inverting device 344 is equal to that of an output terminal P5 of inverting device 344.
  • switching device 342 is turned off such that a logic level of the output terminal P5 is the inverse of the input terminal P4.
  • inverting device 344 can be an inverter 416 and switching device 342 can be a switch 415.
  • inverting device 344 can include inverters connected in series, with a switch being coupled between an input terminal of a first of the inverters and an output terminal of a last inverters. Additionally, inverting device 344 can comprise a plurality of inverters connected in series, with a plurality of switches, each connected in parallel with one of the inverters. Since inverting device 344 has an inverse function during the second period, the number of inverters should be odd.
  • photo-sensor 411 detects brightness of light emitted from light-emitting elements of a display panel. Since the light-emitting elements age, the brightness of light emitted from the light-emitting elements typically will decay. Thus, signal generator 24 can compensate for the decaying brightness due to aging of light-emitting elements.
  • Fig. 3 is a timing diagram of the preset signal STV of Fig. 2b. Assuming the high voltage of inverter 416 is equal to 5V and low voltage thereof is equal to 0V, then during a first period D1, switch 415 is turned on such that voltages of nodes P4 and P5 are equal to 2.5V. Therefore, preset signal STV1 approximately equals 2.5V.
  • control signal Sc is at a high logic level such that transistor 414 is turned on. Therefore, voltage of node P3 equals reference voltage Vref. If the brightness of light emitted from light-emitting elements of a display panel changes from bright to dark, the reference voltage Vref output from photo-detection device 322 is equal to 1V. When voltage V P4 of node P4 equals 2.5V and voltage V P3 of node P3 equals 1V, the voltage Vc of capacitor 362 equals -1.5V.
  • control signal Sc is at a low logic level such that transistor 413 is turned on. Therefore, the voltage V P3 is equal to reference signal Sp.
  • Reference signal Sp is a triangular signal in this embodiment having a maximum voltage equal to 5V and a minimum voltage equal to 0V. Since voltage Vc equals to - 1.5V, when voltage V P3 is less than 1V, preset signal STV1 is at a high logic level, and when voltage V P3 is more than 1V, preset signal STV1 is at a low logic level.
  • switch 415 is turned on such that voltages of nodes P4 and P5 are equal to 2.5V. Therefore, preset signal STV1 is equal to 2.5V and voltage Vc will be changed according to reference voltage Vref.
  • the reference voltage Vref output from photo-detection device 322 is equal to 4V.
  • voltage V P4 of node P4 equals 2.5V and voltage V P3 of node P3 equals to 4V
  • voltage Vc of capacitor 362 equals 1.5V.
  • control signal Sc is at a low logic level such that transistor 413 is turned on. Therefore, the voltage V P3 equals reference signal Sp. Since voltage Vc equals 1.5V when voltage V P3 is less than 4V, preset signal STV2 is at a high logic level, and when voltage V P3 is more than 4V, preset signal STV2 is at a low logic level.
  • switch 415 is turned on such that voltages of nodes P4 and P5 are equal to 2.5V. Therefore, preset signal STV2 is equal to 2.5V and voltage Vc will be changed according to reference voltage Vref.
  • reference voltage Vref output from photo-detection device 322 changes to adjust a duty cycle of preset signal STV.
  • Fig. 4 is a schematic diagram of another exemplary embodiment of a system for controlling brightness of displayed images.
  • Fig. 4 is similar to the embodiment of Fig. 2b except that a second processing unit 38 is coupled to first processing unit 34.
  • the first processing unit 38 comprises a switching device 382 and an inverting device 384 connected in parallel with switching device 382.
  • switching device 382 is turned on such that a voltage of an input terminal P6 of inverting device 384 is equal to that of an output terminal P7 of inverting device 384.
  • switching device 382 is turned off such that a logic level of the output terminal P7 is the inverse of the input terminal P6.
  • inverting device 384 can be an inverter 418 and switching device 382 can be a switch 417.
  • inverting device 384 can include inverters connected in series, with a switch coupled between an input terminal of a first of the inverters and an output terminal of a last of the inverters. Additionally, inverting device 384 can comprise a plurality of inverters connected in series, and a plurality switches, each connected in parallel to one of the inverters. Since inverting device 384 has an inverse function during the second period, the number of inverters should be odd. The number of inverters of inverting devices 344 and 384 preferably is even.
  • photo-sensor 411 detects environmental brightness (ambient light).
  • Fig. 5 is a timing diagram of the preset signal STV of Fig. 4. Since signal generator 24 shown in Fig. 4 detects environmental brightness, preset signals STV1 and STV2 are generated accordingly. Preset signal STV1 is generated when environmental brightness is high. Preset signal STV2 is generated when environmental brightness is low.
  • the signal generator shown in Fig. 4 comprises second processing unit
  • the preset signals STV 1 and STV2 shown in Fig. 5 are inverse to the preset signals STV1 and STV2 shown in Fig. 3.
  • Fig. 6 is a schematic diagram of another embodiment of a system for controlling brightness of displayed images.
  • system 20 comprises a display panel 22, a signal generator 24, and a driving device 26.
  • Display panel 22 comprises a plurality of light-emitting elements (not shown).
  • display panel 22 is a liquid crystal display panel although in other embodiments, the panel could be an electroluminescent display panel for example. If display panel 22 is a liquid crystal display panel, the light-emitting elements of display panel 22 are string lamps. If display panel 22 is an electroluminescent display panel, the light-emitting elements of display panel 22 are electroluminescent elements.
  • Signal generator 24 generates a preset signal STV according to brightness of light such as environmental light or light from a light-emitting element.
  • Driving device 26 comprises a scan driver 262 and a data driver 264. Driving device 26 adjusts brightness of light emitted from the light-emitting elements according to preset signal STV.
  • display panel 22 is an electroluminescent display panel
  • display panel 22 comprises a plurality of pixels.
  • Each pixel comprises an electroluminescent element.
  • Fig. 7 is a schematic diagram of an embodiment of a pixel. For clarity, only one pixel is shown.
  • a transistor M1a When scan driver 262 asserts scan signal S1, a transistor M1a is turned on such that a capacitor Ca is charged according to a data signal D1 provided from data driver 264. As the voltage stored in capacitor Ca is sufficient to turn on a transistor M2a, high voltage Vdd can be output to a transistor M3a.
  • driving signal SC1 provided by scan driver 262 is at a high logic level, transistor M3a is turned off such that electroluminescent element ELa does not emit light. If driving signal SC1 is at low logic level, transistor M3a is turned on such that electroluminescent element ELa emits light.
  • a duty cycle of preset signal STV is utilized to control the turn-on time of transistor M3a for controlling the brightness emitted from display panel 22.
  • preset signal STV1 is generated while brightness emitted from light-emitting elements of display panel 22 is changed from bright to dark.
  • Scan driver 262 provides driving signal SC1 according to preset signal STV1 shown in Fig. 3.
  • driving signal SC1 is equal to preset signal STV1.
  • the gate of transistor M3a receives driving signal SC1
  • turn-on time of electroluminescent element ELa is longer than the turn-off time of electroluminescent element ELa.
  • Preset signal STV2 is generated while brightness of light emitted from the light-emitting elements of display panel 22 is changed from dark to bright.
  • Scan driver 262 provides driving signal SC1 according to preset signal STV2 shown in Fig. 3.
  • driving signal SC 1 is equal to preset signal STV2.
  • the gate of transistor M3a receives driving signal SC1
  • turn-off time of electroluminescent element ELa is longer than turn-on time of electroluminescent element ELa. Therefore, brightness emitted from display panel 22 is low.
  • Fig. 8 is a schematic diagram of another embodiment of a pixel. As transistor M1b is turned on, capacitor Cb can be charged. When voltage stored in capacitor Cb is sufficient to turn on transistor M2b, an anode of electroluminescent element ELb receives high voltage Vdd.
  • electroluminescent element ELb When driving signal SC1 is at a low logic level, electroluminescent element ELb emits light. When driving signal SC1 is at a high logic level, electroluminescent element ELb does not emit light.
  • preset signal STV1 is generated as environmental brightness is low.
  • Scan driver 262 provides driving signal SC1 according to preset signal STV1 shown in Fig. 5.
  • driving signal SC1 is equal to preset signal STV1.
  • Preset signal STV2 is generated as brightness emitted from an environment is bright.
  • Scan driver 262 provides driving signal SC1 according to preset signal STV2 shown in Fig. 5.
  • driving signal SC1 is equal to preset signal STV2.
  • STV1 preset signal
  • turn-on time of electroluminescent element ELa is longer than turn-off time of electroluminescent element ELb. Therefore, brightness emitted from display panel 22 is high.
  • signal generator 24 controls a duty cycle of a preset signal according to brightness of environmental light and/or of light of a light-emitting element.
  • the signal generator 24 is utilized in an electronic system comprising a display panel, if the signal generator 24 detects environmental brightness, brightness of the display panel is changed accordingly. If the signal generator 24 detects brightness of light emitted from the light-emitting element, aging of the light-emitting element can be mitigated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP05112302A 2005-12-16 2005-12-16 Systèmes pour contrôler la luminosité d'images affichées Withdrawn EP1798716A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05112302A EP1798716A1 (fr) 2005-12-16 2005-12-16 Systèmes pour contrôler la luminosité d'images affichées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05112302A EP1798716A1 (fr) 2005-12-16 2005-12-16 Systèmes pour contrôler la luminosité d'images affichées

Publications (1)

Publication Number Publication Date
EP1798716A1 true EP1798716A1 (fr) 2007-06-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20090319A1 (it) * 2009-10-29 2011-04-30 Umberto Cocchi Sistema di illuminazione votiva e cimiteriale ad effetto psico-ottico con diodi led

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170155A (en) * 1990-10-19 1992-12-08 Thomson S.A. System for applying brightness signals to a display device and comparator therefore
EP0685831A1 (fr) * 1994-05-31 1995-12-06 Sharp Kabushiki Kaisha Dispositif d'affichage à cristal liquide avec une fonction de commande de l'éclairage par l'arrière
US20040012340A1 (en) * 2002-04-03 2004-01-22 Sanyo Electric Co., Ltd. Organic EL display device
DE10227487A1 (de) * 2002-06-19 2004-03-18 Wilo Ag Beleuchtungsvorrichtung
US20040105287A1 (en) * 2002-08-19 2004-06-03 Jae-Soon Choi Inverter driving device and method
WO2005006291A1 (fr) * 2003-07-09 2005-01-20 Koninklijke Philips Electronics N.V. Dispositif d'affichage electroluminescent a commande du temps de mise sous tension

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170155A (en) * 1990-10-19 1992-12-08 Thomson S.A. System for applying brightness signals to a display device and comparator therefore
EP0685831A1 (fr) * 1994-05-31 1995-12-06 Sharp Kabushiki Kaisha Dispositif d'affichage à cristal liquide avec une fonction de commande de l'éclairage par l'arrière
US20040012340A1 (en) * 2002-04-03 2004-01-22 Sanyo Electric Co., Ltd. Organic EL display device
DE10227487A1 (de) * 2002-06-19 2004-03-18 Wilo Ag Beleuchtungsvorrichtung
US20040105287A1 (en) * 2002-08-19 2004-06-03 Jae-Soon Choi Inverter driving device and method
WO2005006291A1 (fr) * 2003-07-09 2005-01-20 Koninklijke Philips Electronics N.V. Dispositif d'affichage electroluminescent a commande du temps de mise sous tension

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20090319A1 (it) * 2009-10-29 2011-04-30 Umberto Cocchi Sistema di illuminazione votiva e cimiteriale ad effetto psico-ottico con diodi led

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