Sound Quality Enhancement by using the Single Core Exciter in OLED Panel

( Sungtae Lee ),( Kwanho Park ),( Hyungwoo Park ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.2

With the development of display engineering and technology, the screen and sound quality of information devices such as TVs are improving. The screen used LEDs via LCD and PDP and a large flat panel in the early CRT to create super-high resolution. The sound is improved by directly vibrating a thin and simple panel, such as an OLED. In our previous study, the exciter speaker was attached to the rear of the OLED panel to be used as the diaphragm of the speaker, and the sound quality was as good as that of the TV using the existing dynamic speaker. This method supplied the viewer with the direct sound coming from the panel, delivering clear sound, and the sound and image came from the same location, thus giving the viewer high immersion and maximizing the effect of information transfer. OLED exciter speakers, however, have a special directivity, which tends to slightly attenuate the tone at the very center of the screen. This study improves the sound quality by improving the structure of the exciter speaker and the radiated sound of the flat panel display. A 2-in-1 Exciter is made into a single core to improve the speaker's radiation pattern.

OLED 평면 스피커 위치에 따른 음질 개선에 관한 연구

박형우,배명진 사단법인 인문사회과학기술융합학회 2017 예술인문사회융합멀티미디어논문지 Vol.7 No.12

With advances in electronics technology, the design of organic light - emitting diode (OLED) panels, such as planar information displays, has been improved and their thicknesses have also been reduced. In particular, unlike an LCD (Liquid Crystal Display) information display device, an LED panel can reduce the number of layers constituting a screen, and can also reduce the thickness of each layer. Today, the development direction of the display device is focused on the appearance of the visible part, the aspect of the power efficiency, the quality of the image, and the like. But the part about the sound is being overlooked in the age of five-sense-satisfaction. However, the information display device is transferred from a CRT (Cathode Ray tube) to an LCD and from an LCD to an LED, and it is also possible to realize effects on high-quality direct sound. Conventional LCD monitors and TVs generally have a speaker in the downward direction or a sound from the rear to hear the reflected sound from the wall and the floor. In this study, we introduce the direct driving speaker which implements the sound by directly vibrating the information display glass layer on the LED panel, and show how to improve the sound quality of this flat panel display speaker. Using the LED glass panel as a diaphragm, it is confirmed that the sound quality is clear and the sound source can be reproduced effectively in a wide frequency band. 전자공학 기술의 발전으로, 평면 정보표시장치와 같은 OLED(organic light - emitting diode) panel의 디자인이 향상되고, 그 두께 또한 얇아지고 있다. 특히, LCD(Liquid - crystal display) 정보표시장치와 달리, LED panel의 경우 화면을 구성하는 layer의 수를 줄일 수 있고, 층마다 두께 또한 얇게 만들 수 있는 장점이 있다. 오늘날 디스플레이 장치의 발전 방향은 눈에 보이는 부분인 외형의 디자인과 전력효율의 측면, 화질의 우수성 등이 위주가 되어, 5감 만족 시대에 음향에 대한 부분을 간과하고 진행되고 있다. 그러나, 정보표시장치가 CRT(Cathode ray tube)에서 LCD로, LCD에서 LED로 넘어가게 되며 고품질 직접 음향에 대한 효과도 구현이 가능하게 되었다. 기존의 LCD 모니터, TV 등은 스피커의 방향이 아래 방향이거나, 후방에서 소리를 만들어 벽면과 바닥에 반사된 소리를 시청자가 듣는 것이 일반적이다. 본 연구에서는 LED panel에서 정보 표시 glass 층을 직접 진동시켜 음향을 구현하는 직접구동 스피커에 대해 소개하고, 이 평판 정보표시 스피커의 음질을 향상시키는 방법을 소개한다. LED의 glass panel을 진동판으로 사용하여 음질이 맑고, 넓은 주파수 대역에서 효과적인 음원의 재생이 가능함을 확인하였다.

성당 미사공간의 실내음향특성에 관한 실험적 연구

박현구,조경숙,김선우 대한건축학회 2003 대한건축학회논문집 Vol.19 No.2

This study has performed to analyse the measurement the main hall of Catholic churches and to find out general room acoustical characteristics. Furthermore, extracted data could be used in subjective evaluation for optimum values of each physical parameter. For the reason, we surveyed whole Catholic churches located in Gwangju metropolitan city and finally chose 11 churches to measure. Room volume of buildings chosen is ranged widely from 1,782 to 9,195 cubic meter so that measured values can be distributed including various characteristics of acoustical parameters. As a result, the differences of values using PA system as sound source were larger than those using omnidirectional speaker in the center part of alter and values of D50 and C80 in the balcony floor were especially appeared to have different values comparing with those of main floor due to diversified layout of speakers. The range of RT and EDT was from 1 to 3 sec. approximately depending on the room volume and sound absorbing materials installed on floor, wall and ceiling and it was revealed that RT at 250㎐ of center frequency range was shortest and RT at 1㎑ was largest as most of the materials applied to finishing were panel absorbers and reflectors such as wood panel, concrete and brick.

재질분포가 직교이방 조화함수로 변하는 사각 평판의 굽힘 진동 해석

김진오,문병환 한국소음진동공학회 2001 소음 진동 Vol.11 No.2

The paper describes a theoretical study on the flexural vibration of an elastic rectangular plate with periodically nonuniform material properties. The approximate solution of the natural frequency and mode shape has been obtained using the perturbation technique for sinusoidal modulation of the flexural rigidity and mass density. It has been shown that distributed modes exist in the plate which Is a two-dimensional model of the flat panel speaker.

패널 스피커의 가진기 및 스피커 배치에 관한 연구

우정한,이성현,서윤호,마평식,김동준 한국음향학회 2023 韓國音響學會誌 Vol.42 No.5

얇은 패널에서 음향 정보를 전달하기 위해서 단일 지점을 가진하는 방법은 패널 자체의 진동 특성의 영향으로방사되는 음장에 영향을 끼치게 된다. 기존의 패널 자체를 방사체로 활용 하고자 하는 스피커 시스템은 단일 또는 스테레오 사운드 제공 목적으로 음원이 되도록 하는 패널 특정 위치에 부착된 가진기를 이용하게 된다. 이렇게 방사하는음향은 판이 갖는 모달 특성으로 인해 쉽게 왜곡될 수 있어 충분한 음향 파워를 갖거나 높은 방사효율을 기대하기 어렵다. 또한, 몰입감 높은 음장을 구현하기 위해서 한정된 가진기를 이용하는데 한계가 있다. 본 논문에서는 얇은 패널에고정적으로 부착된 가진기를 이용하여, 패널 임의의 위치에서 음향이 방사되도록 진동-음향 역문제적 기법을 이용하여 진동장을 제어하도록 스피커 영역을 렌더링하여 제어하는 기법에 대해 다루었다. 국소화된 스피커 영역을 패널에서 생성하여 음원의 위치를 변화 시킬 수 있도록 하고, 가지기의 배치와 구현 가능한 스피커 영역의 위치 간 관계를 모사실험을 통해 제어 결과를 비교 및 검토하였다. When the vibration of the thin panel by exciting single point is used to radiate sound, the inherent vibration characteristic of the plate itself causes influence on the radiated sound. A conventional panel speaker system usually uses the single or double point excitations for generating the sound through the panel itself. The radiated sound can be easily distorted due to the modal characteristics of the plate so it is difficult to expect sufficient sound power or high radiation efficiency. In this paper, to achieve an immersive sound field, the multiple speaker zones on a thin panel are created with the limited number of actuators. The designated vibration field which can generates directional sound is realized by employing the vibro-acoustic inverse rendering methods. Actuators are arranged from the positions which have the advantage of implementing with multi-modal excitations. The location and number of actuators are compared with the location and number of controllable speaker zones by conducting numerical simulations.

평판 디스플레이에 적용된 2채널 자기 변형 스피커 개발

최동주(D. J. Choi),박영우(Y. W. Park) 한국정밀공학회 2010 한국정밀공학회 학술발표대회 논문집 Vol.2010 No.5월

2채널 평판 디스플레이 스피커용 자기 변형 구동기의 출력과 음압의 관계 연구

최동주(D. J. Choi),박영우(Y. W. Park),박해정(H. J. Park) 한국정밀공학회 2010 한국정밀공학회 학술발표대회 논문집 Vol.2010 No.11월

메타물질을 이용한 기계시스템의 구조-음향 성능 개선

정재순(Jaesoon Jung),구성열(Seongyeol Goo),왕세명(Semyung Wang) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

A metamaterials is an artificially engineered structure having stop bands (or band gaps) that are frequency bands in which waves cannot propagate. Taking advantage of the stop band the vibration isolation and wave focusing become possible. Using these phenomenon of metamaterial, this paper presents applications of the metamaterial for improvement of vibro-acoustic performances of mechanical systems. Based on the vibration isolation the possibility of structure-borne noise reduction is presented. Furthermore, based on the wave focusing phenomenon the improvement of radiation efficiency of flat panel speaker is presented.

판형 스피커의 고성능 가상 스피커 전환을 위한 가진기 배열 제어

이기호(Ki-Ho Lee),이정권(Jeong-Guon Ih) 한국소음진동공학회 2018 한국소음진동공학회 학술대회논문집 Vol.2018 No.10

연계 해석을 이용한 스피커 그릴 신뢰성 시험 연구

임학송(Haksong Lim),박기웅(Giung Park) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6