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1. WO2016053913 - ASYMMETRIC MULTIPHASE BOOST FOR DISPLAY BACKLIGHTS

Publication Number WO/2016/053913
Publication Date 07.04.2016
International Application No. PCT/US2015/052749
International Filing Date 29.09.2015
IPC
G09G 3/34 2006.1
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
34by control of light from an independent source
H02M 1/00 2007.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
1Details of apparatus for conversion
H02M 1/36 2007.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
1Details of apparatus for conversion
36Means for starting or stopping converters
H02M 3/156 2006.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
3Conversion of dc power input into dc power output
02without intermediate conversion into ac
04by static converters
10using discharge tubes with control electrode or semiconductor devices with control electrode
145using devices of a triode or transistor type requiring continuous application of a control signal
155using semiconductor devices only
156with automatic control of output voltage or current, e.g. switching regulators
H02M 3/158 2006.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
3Conversion of dc power input into dc power output
02without intermediate conversion into ac
04by static converters
10using discharge tubes with control electrode or semiconductor devices with control electrode
145using devices of a triode or transistor type requiring continuous application of a control signal
155using semiconductor devices only
156with automatic control of output voltage or current, e.g. switching regulators
158including plural semiconductor devices as final control devices for a single load
H04M 1/22 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
1Substation equipment, e.g. for use by subscribers
02Constructional features of telephone sets
22Illumination; Arrangements for improving the visibility of characters on dials
CPC
G09G 2320/0633
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2320Control of display operating conditions
06Adjustment of display parameters
0626for control of overall brightness
0633by amplitude modulation of the brightness of the illumination source
G09G 2330/02
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
2330Aspects of power supply; Aspects of display protection and defect management
02Details of power systems and of start or stop of display operation
G09G 3/3406
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
34by control of light from an independent source
3406Control of illumination source
G09G 3/342
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
34by control of light from an independent source
3406Control of illumination source
342using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
G09G 5/10
GPHYSICS
09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
5Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
10Intensity circuits
H02M 1/0032
Applicants
  • APPLE INC. [US]/[US]
Inventors
  • PATEL, Parin
  • HRINYA, Stephen J.
Agents
  • Kowert, Robert C.
Priority Data
14/502,88630.09.2014US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) ASYMMETRIC MULTIPHASE BOOST FOR DISPLAY BACKLIGHTS
(FR) SURVOLTEUR MULTIPHASÉ ASYMÉTRIQUE POUR RÉTROÉCLAIRAGES D'AFFICHAGE
Abstract
(EN) An asymmetric multiphase boost that provides flash functionality for display backlights. A backlight power management module for a display backlight may implement and control an asymmetric multiphase boost that includes two boost phases: a primary boost phase for typical display backlighting, and a secondary or flash boost phase that provides flash functionality via the display backlight when needed. The primary boost phase may be sized to provide high low-load efficiency, high inductance, and low switching frequency for normal display backlight operations. The flash boost phase may be sized for high current and peak power, low inductance, and high switching frequency for pulsed current applications. Via the asymmetric multiphase boost, the backlight power management module may, for example, be used to provide a camera flash function for front facing cameras.
(FR) L'invention concerne un survolteur multiphasé asymétrique qui fournit une fonctionnalité de flash pour des rétroéclairages d'affichage. Un module de gestion de puissance de rétroéclairage pour un rétroéclairage d'affichage peut mettre en œuvre et commander un survolteur multiphasé asymétrique qui comprend deux phases de survolteur : une phase de survolteur primaire pour un rétroéclairage d'affichage typique, et une phase de survolteur secondaire ou flash qui fournit une fonctionnalité de flash par l'intermédiaire du rétroéclairage d'affichage lorsque cela est nécessaire. La phase de survolteur primaire peut être dimensionnée pour fournir une haute efficacité à faible charge, une inductance élevée, et une faible fréquence de commutation pour des opérations de rétroéclairage d'affichage normales. La phase de survolteur de flash peut être dimensionnée pour un courant élevé et une puissance de crête, une faible inductance, et une fréquence de commutation élevée, et pour des applications de courant pulsé. Par l'intermédiaire du survolteur multiphasé asymétrique, le module de gestion de puissance de rétroéclairage peut, par exemple, être utilisé pour fournir une fonction de flash d'appareil photo pour des appareils photo orientés vers l'avant.
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