
Driving WLED as Backlight for Small and Medium Size LCD Display
This topic evaluates charge-pump and inductive boost topologies for several critical factors in
backlighting with white-light-emitting diodes (WLEDs) in mobile applications. First, pros and cons of
each method and guidelines for selecting the right one are introduced. Next, ways to improve the efficiency
of WLED drivers are analyzed with respect to mode transition voltage, output impedance, current-sink
threshold voltage, and typical sources of circuit losses. Finally, analog, digital, and pulse-width modulation
(PWM) dimming methods for optimal brightness control are compared.
Par Sang-Woo Lee, Michael Wang
Langue :
Anglais
Société :
Texas Instruments
Pour télécharger le PDF, veuillez vous connecter ou créer un compte
This topic evaluates charge-pump and inductive boost topologies for several critical factors in
backlighting with white-light-emitting diodes (WLEDs) in mobile applications. First, pros and cons of
each method and guidelines for selecting the right one are introduced. Next, ways to improve the efficiency
of WLED drivers are analyzed with respect to mode transition voltage, output impedance, current-sink
threshold voltage, and typical sources of circuit losses. Finally, analog, digital, and pulse-width modulation
(PWM) dimming methods for optimal brightness control are compared.
Par Sang-Woo Lee, Michael Wang
Langue :
Anglais
Société :
Texas Instruments
Pour télécharger le PDF, veuillez vous connecter ou créer un compte