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公开(公告)号:US10887966B2
公开(公告)日:2021-01-05
申请号:US16200314
申请日:2018-11-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor: Jun Ma , Shuxiao Xu , Minwen Shi
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.
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公开(公告)号:US10088856B2
公开(公告)日:2018-10-02
申请号:US15588089
申请日:2017-05-05
Applicant: Texas Instruments Incorporated
Inventor: Alvin Xu , Qingjie Ma , Yang Wang , Yan He , Jun Ma , Zhenghao Cui , Jingwei Xu
Abstract: Methods, apparatus, systems and articles of manufacture for negative output voltage active clamping using a floating bandgap reference and temperature compensation are disclosed. An example load switch includes a floating bandgap reference circuit to generate a bandgap reference voltage. A resistor divider is to generate a resistor divider voltage. A temperature compensator to apply a temperature compensation current to the resistor divider to create a temperature compensated resistor divider voltage. A power transistor is to be enabled when the temperature compensated resistor divider voltage is less than the bandgap reference voltage. The example load switch can work under negative output voltage clamping and get better accuracy drain to source clamped voltage of power transistor for inductive load condition.
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