US 11,750,979 B2
Display apparatus including a sound generating device
YongGyoon Jang, Paju-si (KR); Chiwan Kim, Paju-si (KR); Taeheon Kim, Paju-si (KR); Sung-Eui Shin, Paju-si (KR); YongWoo Lee, Paju-si (KR); Kyungyeol Ryu, Paju-si (KR); and Yuseon Kho, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Sep. 1, 2021, as Appl. No. 17/464,660.
Application 17/464,660 is a continuation of application No. 16/654,562, filed on Oct. 16, 2019, granted, now 11,140,492.
Claims priority of application No. 10-2018-0139230 (KR), filed on Nov. 13, 2018.
Prior Publication US 2021/0400396 A1, Dec. 23, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 17/00 (2006.01); H04R 1/02 (2006.01)
CPC H04R 17/005 (2013.01) [H04R 1/028 (2013.01); H04R 2499/15 (2013.01)] 32 Claims
OG exemplary drawing
 
1. A display apparatus, comprising:
a display panel configured to display an image; and
a sound generating device at a rear surface of the display panel, the sound generating device being configured to vibrate the display panel and generate sound, the sound generating device comprising:
a first electrode;
a first structure under the first electrode, the first structure comprising a polymer matrix and a piezoelectric material dispersed in the polymer matrix;
a second electrode under the first structure;
a second structure over the first electrode, the second structure comprising:
a first part having a piezoelectric characteristic; and
a second part between adjacent first parts and having flexibility, the second part including a different material from the first part; and
a third electrode between the display panel and the second structure,
wherein the first part and the second part are alternatively disposed along a horizontal direction and have a same thickness in a vertical direction, and
wherein a polarization direction of the first structure is different from a polarization direction of the second structure.