Patent ID: 11929044
Assignee: HKC CORPORATION LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 0:
1. A backlight module, comprising: a first light-emitting region and a second light-emitting region encircling the first light-emitting region, wherein
the backlight module comprises at least one first light-emitting module and at least one second light-emitting module, the at least one second light-emitting module is arranged on a peripheral side of the first light-emitting module, the at least one first light-emitting module is located in the first light-emitting region, and the at least one second light-emitting module is located in the second light-emitting region;
the first light-emitting module comprises a plurality of first light strings, the second light-emitting module comprises a plurality of second light strings, and the plurality of first light strings has a layout density greater than the plurality of second light strings; and
the first light string comprises a first light-emitting column, a second light-emitting column, and a first switch unit, the first switch unit is electrically connected to a first terminal of the first light-emitting column, a first terminal of the second light-emitting column, and a second terminal of the second light-emitting column, and the first switch unit is configured to selectively connect the first light-emitting column and the second light-emitting column in series, or electrically connect the first terminal of the first light-emitting column to the first terminal of the second light-emitting column; wherein
the first switch unit comprises a first drive transistor, a second drive transistor, and a third drive transistor, a first terminal of the first drive transistor and a first terminal of the second drive transistor are electrically connected to the first terminal of the first light-emitting column, a second terminal of the first drive transistor is electrically connected to the first terminal of the second light-emitting column, a second terminal of the second drive transistor and a second terminal of the third drive transistor are electrically connected to the second terminal of the second light-emitting column, a control terminal of the first drive transistor, a control terminal of the second drive transistor, and a control terminal of the third drive transistor are each configured to receive a control signal; and wherein
the first light-emitting column and the second light-emitting column are connected in series, when the first drive transistor is turned off, the second drive transistor is turned on, and the third drive transistor is turned off; or
the first terminal of the first light-emitting column is electrically connected to the first terminal of the second light-emitting column, when the first drive transistor is turned on, the second drive transistor is turned off, and the third drive transistor is turned on.