公开(公告)号：US11908422B2

公开(公告)日：2024-02-20

申请号：US17986675

申请日：2022-11-14

Applicant: SAMSUNG DISPLAY CO., LTD.

Inventor： Hyung Gun Ma ,  Oh Jo Kwon ,  Ji Woong Kim ,  Jun Yong Song ,  Seong Joo Lee ,  Sang Hyun Heo

IPC: G09G3/3275 ,  H03M1/66 ,  G09G3/32

CPC classification number: G09G3/3275 ,  H03M1/66 ,  G09G3/32 ,  G09G2310/027 ,  G09G2310/0259 ,  G09G2310/0291 ,  G09G2330/021 ,  G09G2330/028

Abstract: A digital-analog converter of the disclosure converts digital image data to generate analog data signals. The digital-analog converter includes a voltage divider which generates a plurality of gamma reference voltages based on a first reference voltage and a second reference voltage; a global ramp including a plurality of gamma decoders which generates a plurality of global gamma voltages based on the gamma reference voltages; a decoder which selects one of the global gamma voltages according to the digital image data to generate the analog data signals; and a ramp controller which turns off at least some of the gamma decoders based on the digital image data.

公开(公告)号：US10922516B2

公开(公告)日：2021-02-16

申请号：US16387545

申请日：2019-04-18

Applicant: Samsung Display Co. Ltd.

Inventor： Jeon Kyoo Kim ,  Jun Yong Song ,  Jae Keun Lim

IPC: G06K9/00 ,  G09G3/3233 ,  G06F3/044 ,  G06F21/32 ,  G06F3/041

Abstract: A display device has a display area with a first area in which a fingerprint is recognized and a second area in which a fingerprint is not recognized, and a non-display area. A fingerprint sensing unit is disposed to overlap with the first area. A first pixel set is disposed to overlap with the first area, and a second pixel set is disposed to overlap with the second area, each set including a plurality of pixels. A first voltage signal is provided to the first pixel set as a variable frequency signal, and includes a first period during which the first voltage signal is a first frequency signal, a second period during which the first voltage signal is a second frequency signal having a lower frequency than the first frequency signal, and a third period during which the first voltage signal is the first frequency signal.