LED Driving Circuit Preventing Light Leakage Issue
AssigneeHannstar Display Corp.
InventorsYu TSAI, Che-Yu CHUANG
Life of this patent
Estimating the term…
Abstract
A light emitting diode (LED) driving circuit preventing light leakage issue. The LED driving circuit comprises an LED driver, a driving circuit module and a power supply. When an input voltage is much higher, a high frequency pulse width modulation signal is set to a low level to avoid a light leakage of the LED by turning off a metal oxide semiconductor field effect transistor (MOSFET), such that the input voltage is not limited by the light leakage of the LED. As a result, the input voltage can be increased sufficiently for further reducing a switching loss effectively.
Claims10
A light emitting diode (LED) driving circuit applicable to an LED module, comprising:
- an LED driver, comprising a first enable pin;
- a driving circuit module, comprising a metal oxide semiconductor field effect transistor (MOSFET), and a gate of the MOSFET being electrically coupled to a second enable pin;
- and
- a power supply;
- wherein the LED module, the LED driver and the driving circuit module are electrically coupled to each other, and the LED driver and the power supply are electrically coupled to each other, and the first enable pin is provided for receiving a high frequency pulse width modulation signal to drive the driving circuit module, and the driving circuit module further drives the LED module to emit light, and the second enable pin is provided for receiving the high frequency pulse width modulation signal.
Dependencies are inferred from the claim text.