Method for driving LED backlight driving circuit based on low-potential-end switch control
US12154521B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2024 |
| Grant date | Nov 26, 2024 |
| Priority date | — |
| Expiry date | Jul 18, 2044 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An LED backlight driving circuit based on low-potential-end switch control and a backlight driving method are provided. The LED backlight driving circuit includes a plurality of LED strings, a channel control switch device, a constant current module, a channel switching control module, a signal control unit, and an SPI interface unit. Each of the LED strings has a high-potential-end directly connected to an LED driving voltage VLED and a low-potential-end connected to one channel control switch device and one constant current module, and a plurality of channel control switch devices in each group of LED strings are connected to one channel switching control module; and the channel switching control module is used to control the on-state duty cycle of the LED strings in the group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.