EP 4310826 A1 20240124 - BRIGHTNESS ADJUSTMENT METHOD FOR BACKLIGHT MODULE AND RELATED DEVICE
Title (en)
BRIGHTNESS ADJUSTMENT METHOD FOR BACKLIGHT MODULE AND RELATED DEVICE
Title (de)
HELLIGKEITSANPASSUNGSVERFAHREN FÜR EIN HINTERGRUNDBELEUCHTUNGSMODUL UND ZUGEHÖRIGE VORRICHTUNG
Title (fr)
PROCÉDÉ DE RÉGLAGE DE LUMINOSITÉ POUR MODULE DE RÉTROÉCLAIRAGE ET DISPOSITIF ASSOCIÉ
Publication
Application
Priority
- CN 202110442749 A 20210423
- CN 2022087986 W 20220420
Abstract (en)
This application provides a method for adjusting brightness of a backlight module and a related apparatus. The brightness adjustment method includes: obtaining a brightness gray-scale value of a light emitting area corresponding to each channel; determining, based on the brightness gray-scale value corresponding to each channel and a preset threshold, a dimming mode corresponding to each channel; and determining, based on a correspondence between an operating current and a brightness gray-scale value of the channel in different dimming modes, an amplitude and a duty cycle of the operating current output by each channel. According to the brightness adjustment method in embodiments of this application, the current adjustment mode is used in a low gray scale, the duty cycle of the operating current remains unchanged, and brightness of the backlight module is adjusted by changing the amplitude of the operating current. In this way, impact of rise time and fall time of the operating current on a pulse waveform can be reduced, impact of a parasitic capacitance of a wiring can be reduced, and brightness linearity of the backlight module can be improved.
IPC 8 full level
G09G 3/34 (2006.01)
CPC (source: CN EP)
G09G 3/20 (2013.01 - EP); G09G 3/2081 (2013.01 - EP); G09G 3/3406 (2013.01 - CN); G09G 3/3413 (2013.01 - CN); H05B 45/10 (2020.01 - EP); H05B 45/325 (2020.01 - CN); G09G 2320/0233 (2013.01 - CN EP); G09G 2320/0271 (2013.01 - CN); G09G 2320/0633 (2013.01 - EP); G09G 2320/064 (2013.01 - EP); G09G 2320/0646 (2013.01 - EP); G09G 2360/16 (2013.01 - EP); H05B 45/325 (2020.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4310826 A1 20240124; CN 115240603 A 20221025; WO 2022222969 A1 20221027
DOCDB simple family (application)
EP 22791075 A 20220420; CN 202110442749 A 20210423; CN 2022087986 W 20220420