公开(公告)号：US11199734B2

公开(公告)日：2021-12-14

申请号：US16903386

申请日：2020-06-17

Applicant: Novatek Microelectronics Corp.

Inventor： JianHua Liang ,  Xiao Zhang ,  Qiqiang Han

IPC: G02F1/133 ,  G02F1/13357 ,  G02F1/1335

Abstract: The disclosure provides an image adjustment device configured to be different modes according to whether the adopted display is a light emitting diode display or a liquid crystal display, and including a duty cycle calculator, an intensity calculator and a compensator. In a first mode, the duty cycle calculator determines a respective type of each segment according to brightness information of each segment, and sets a duty cycle value according to the type of the segment. In a second mode, the duty cycle calculator calculates the duty cycle value according to the brightness information of each segment. The intensity calculator calculates the pixel intensity of the segment based on the duty cycle value and a light diffusion coefficient set. The compensator generates a pixel gain value according to the intensity value of each pixel of the segment, and adjusts the pixel value according to the pixel gain value.

公开(公告)号：US10916207B1

公开(公告)日：2021-02-09

申请号：US16664553

申请日：2019-10-25

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Hong-Chun Cong ,  Jian-Hua Liang ,  Xiao Zhang

IPC: G09G5/10 ,  G09G3/36 ,  G02F1/1347

Abstract: A dynamic image split method for a dual cell LCD that includes a back cell and a front cell is proposed to obtain a smoother back-cell image. Multiple desired effective transmittances that correspond to a group of front-cell pixels are taken into consideration in determining a transmittance for a back-cell pixel. The front-cell pixels in the group are related in position to the back-cell, and cooperatively form an area that is larger than and overlaps an area of the back-cell pixel.

公开(公告)号：US10548194B1

公开(公告)日：2020-01-28

申请号：US16429046

申请日：2019-06-02

Applicant: Novatek Microelectronics Corp.

Inventor： Xiao Zhang ,  JianHua Liang

IPC: H05B33/08 ,  H03K7/08 ,  G02F1/1335 ,  G09G3/34

Abstract: A local dimming control method for a backlight module having a plurality of light emitting diodes is provided. The local dimming control method includes the steps of determining an initial duty cycle of a driving signal, calculating brightness of each light emitting diode according to the initial duty cycle, calculating a local luminance of each light emitting diode based on combination of brightness of that light emitting diode and light diffusion of surrounding light emitting diodes, calculating a cost function of clipping error and leaking error according to the local luminance of each light emitting diode and an ideal brightness of the corresponding pixel, calculating a gradient of the cost function of clipping error and leaking error, and adjusting the initial duty cycle according to the gradient, and image characteristics of the pixel and the surrounding pixels to provide an adjusted duty cycle of the driving signal.

公开(公告)号：US11011101B2

公开(公告)日：2021-05-18

申请号：US15985611

申请日：2018-05-21

Applicant: NOVATEK Microelectronics Corp.

Inventor： Xiao Zhang ,  Danyu Fu ,  Yuanjia Du ,  Jianhua Liang ,  Qiqiang Han

IPC: G09G3/20

Abstract: A method of controlling a display device is disclosed including receiving a plurality of sub-pixel values for a target pixel among a plurality of pixels of an image frame, wherein the sub-pixel values of the target pixel comprise red, green, and blue sub-pixel values; calculating a pixel-based boosting ratio corresponding to the target pixel according to the sub-pixel values of the target pixel; and adjusting at least one of a plurality of backlight duties associated with the target pixel and the plurality of sub-pixel values of the target pixel according to the pixel-based boosting ratio.