公开(公告)号：US20200022229A1

公开(公告)日：2020-01-16

申请号：US16200314

申请日：2018-11-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Jun MA ,  Shuxiao XU ,  Minwen SHI

IPC: H05B33/08

Abstract: Methods and apparatus to reduce a coupling effect in a light emitting diode (LED) display are disclosed. An example LED display includes an array of LEDs, and a line controller to select a line of LEDs of the array of LEDs for illumination. The example LED display wall includes a column controller to control illumination of at least two of the LEDs of the line of LEDs. The column controller is to cause, when the first brightness value is less than a threshold, a first LED to be illuminated during a first time period and a second LED to be illuminated during a second time period. The second period is distinct from the first time period. The first LED is a different color than the second LED.

公开(公告)号：US20180192487A1

公开(公告)日：2018-07-05

申请号：US15587992

申请日：2017-05-05

Applicant: Texas Instruments Incorporated

Inventor： Minwen SHI ,  Ruochen ZHANG ,  Qingjie MA

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/083 ,  H05B33/0845

Abstract: A light emitting diode controller integrated circuit includes counter circuitry having inputs coupled to a clock signal input pin, a pulse width modulated signal input pin, and a sense input pin, and has a count output coupled to a gate drive signal output to an external power transistor. The power transistor is connected in series between a power lead, a sense resistor, and a light emitting diode. The sense input pin is coupled to the series connection between the resistor and the transistor. The counter circuitry provides a Ton_delay equal to a Toff_delay of the power transistor. By counting up during a Ton_delay and down during a Toff_delay, the controller can be used with power transistors of unknown characteristics.