Concept of spatial front sound and optically invisible antenna on display liquid crystal cellular devices
- Title
- Concept of spatial front sound and optically invisible antenna on display liquid crystal cellular devices
- Authors
- Sion Cha; Wooksung Kim
- Date Issued
- 2019-08-27
- Publisher
- The Korean Information Display Society (KIDS)
- Abstract
- Presently,
Liquid Crystal Displays (LCDs) are the dominant technology over the display market. However, a long
with the r apid development in OLED technology , the LCD industry is facing through challenges and requiring
new applications based on its intrastructure This paper proposes a novel c oncept of an LCD panel combined with
spatial front speakers and optically invisible anten na s While conventional cellular devices have a Bottom Facing
S peaker , it adopts a dual channel front facing speaker. Existing front sound devices such as Crystal Sound
OLED(CSO) utilize the panel as a flat diaphragm and it is because the OLED panel i s thinner and more durable
than LCD s . Different from the earlier approaches , we suggest a different front sound technology , which chooses
Touch Screen Panel(TSP) as a diaph ragm in front of the d isplay panel. Fig. 1.(a) depicts a direct driving front
sound generation structure. The exciter at Au dio Layer(AL) produces a spatial sound by vibrating TS P and our
two exciters delivers the vibration s to the top and bottom plates. Those d istributed sounds built in dual channel
provides volumetric stereo sound. In th e case of an optically invisible antenna, a liquid crystal ( layer is used
as a phase shifter. Fig. 1.(b) shows a single anten n a element unit . The i nserted microstrip antenna radiates an
ele c tromagnetic wave to upward direction and birefringence properti es of LC modify the wave front . In order to
avoid the effect that the electrode blocks the radiation of the EM wave, we ch ose the In Pla ne Switching(IPS)
configuration whose pixel consists of 4 sub pixels , such as red, gree n, blue and antenna element. The aligned
several pixels constitute a phased array antenna on the LCD panel.
We are optimizing the sound and electromagnetic wave using Finite Element Method (FEM) simulation package, COMSOL MULTIPHYSICS. It enables us to estimate and compare the sound and antenna quality of the cellular device. Display specifications such as transmittance and color gamut are calculated by TECHWIZ LCD, three dimensional LCD simulation software. In conclusion, this paper presents a concept of a new type cellular device combined with the Sound on Display (SoD) and Antenna on Display (AoD) technologies. The proposed cellular device, with functions of display, speaker and antenna, can have excellent bezel-less properties, and various modules in the present cellular display can be also included.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106406
- Article Type
- Conference
- Citation
- The 19th International Meeting on Information Display (IMID 2019), 2019-08-27
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