公开(公告)号：US08786213B2

公开(公告)日：2014-07-22

申请号：US13706219

申请日：2012-12-05

Applicant: Richtek Technology Corporation

Inventor： Shei-Chie Yang ,  Shui-Mu Lin ,  Jun-Sheng Cheng ,  Ming-Yu Lin ,  Chun-I Lin

IPC: H05B37/02

CPC classification number: H05B37/02 ,  H05B33/0848

Abstract: LED dimming control circuit and method compensate LED current or LED average current by LED characteristics to improve dimming efficiency and performance. LED characteristic related look-up tables are stored to provide compensation values, and input LED current setting information is compensated by the compensation values to generate corrected LED current setting information for determining LED brightness.

Abstract translation: LED调光控制电路和方法通过LED特性补偿LED电流或LED平均电流，提高调光效率和性能。 存储LED特征相关查找表以提供补偿值，并且通过补偿值补偿输入LED电流设置信息，以产生用于确定LED亮度的校正LED电流设置信息。

公开(公告)号：US10043471B2

公开(公告)日：2018-08-07

申请号：US14954513

申请日：2015-11-30

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Der-Jiunn Wang ,  Chung-Hsien Tso ,  Chun-I Lin

IPC: G09G3/36

Abstract: A Gamma curve correction method for an LCD sets a ground potential of the LCD as a common voltage, and adjusts at least one of a plurality of positive Gamma voltages and a plurality of negative Gamma voltages of the LCD such that the central value of a Gamma curve established by the positive Gamma voltages and the negative Gamma voltages becomes closer to the common voltage. As a result, flickers existing in the images of the LCD are improved.