公开(公告)号：US09215771B2

公开(公告)日：2015-12-15

申请号：US13973681

申请日：2013-08-22

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chien-Hua Lin ,  Shui-Mu Lin

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0842

Abstract: A light emitting diode driver includes: a serial-to-parallel conversion unit converting, based on a reference clock signal, a serial input signal carrying a number (N) of M-bit gray codes into a parallel input signal carrying the M-bit gray codes; a counting unit counting an output control signal to output a counting value; a data buffer unit storing, based on a latch signal, the M-bit gray codes carried by the parallel input signal, and outputting, based on the counting value and the M-bit gray codes, an N-bit signal consisting of N bits, each of which is an ith one of M bits of a respective M-bit gray code, where i is associated with the counting value; and an output unit generating a number (N) of driving current signals based on at least the N-bit signal.

Abstract translation: 发光二极管驱动器包括：串行到并行转换单元，将基于参考时钟信号的携带M位灰度代码的（N）个M位的串行输入信号转换为携带M位的并行输入信号 灰色代码; 计数单元，对输出控制信号进行计数以输出计数值; 数据缓冲器单元，基于锁存信号存储并行输入信号所携带的M位灰色代码，并根据计数值和M位灰度代码输出由N位组成的N位信号 ，其中每个是相应M位灰度码的M位中的第i个，其中i与计数值相关联; 以及输出单元，至少基于N位信号生成数量（N）个驱动电流信号。

公开(公告)号：US20140320041A1

公开(公告)日：2014-10-30

申请号：US13973681

申请日：2013-08-22

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chien-Hua Lin ,  Shui-Mu Lin

IPC: H05B33/08

CPC classification number: H05B33/0842

Abstract: A light emitting diode driver includes: a serial-to-parallel conversion unit converting, based on a reference clock signal, a serial input signal carrying a number (N) of M-bit gray codes into a parallel input signal carrying the M-bit gray codes; a counting unit counting an output control signal to output a counting value; a data buffer unit storing, based on a latch signal, the M-bit gray codes carried by the parallel input signal, and outputting, based on the counting value and the M-bit gray codes, an N-bit signal consisting of N bits, each of which is an ith one of M bits of a respective M-bit gray code, where i is associated with the counting value; and an output unit generating a number (N) of driving current signals based on at least the N-bit signal.

Abstract translation: 发光二极管驱动器包括：串行到并行转换单元，将基于参考时钟信号的携带M位灰度代码的（N）个M位的串行输入信号转换为携带M位的并行输入信号 灰色代码; 计数单元，对输出控制信号进行计数以输出计数值; 数据缓冲器单元，基于锁存信号存储并行输入信号所携带的M位灰色代码，并根据计数值和M位灰度代码输出由N位组成的N位信号 ，其中每个是相应M位灰度码的M位中的第i个，其中i与计数值相关联; 以及输出单元，至少基于N位信号生成数量（N）个驱动电流信号。