I would guess the bass is nonexistent here. Cool idea though.
High-quality OLED displays now enabling integrated thin and multichannel audio
51–60 of 81 posts
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#52Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#53Could such a display also function as a microphone?
Good point, piezos do also generate voltages when deformed, so this could conceivably be run in reverse... Microphone arrays are already used for directional sound detection, so this could have fun implications for that application given the claimed density of microphones.
Would a piezo crystal, mounted behind a screen and the glass panel atop it, have enough sensitivity to capture recognizable speech?
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#54Earlier quoted context omitted.
Good point, piezos do also generate voltages when deformed, so this could conceivably be run in reverse... Microphone arrays are already used for directional sound detection, so this could have fun implications for that application given the claimed density of microphones.
Would a piezo crystal, mounted behind a screen and the glass panel atop it, have enough sensitivity to capture recognizable speech?
If you put a dualsense controller atop of glass and send sound through it to the back-left or back-right channels (controls the haptics) you definitely hear it, so I presume yes.
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#55Earlier quoted context omitted.
Probably similar to antennas — using phase shifting and interference.
Yes, probably, but my question was more about the glass cover and if it wouldn't basically destroy the effect?
If it is touching the glass it amplifies it, if anything.
(Edit: I should say it amplifies some frequencies while attenuating others)
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#56This is a long shot but anyone know if there's an audio recording of the sound the display produced? Curious Edit: Found it: https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.20... Go to supporting information on that page and open up the mp4 files
Good find - the first video is a frequency sweep, video 2 has some music. Edit - I'm not sure that's the same thing? The release talks about pixel based sound, the linked paper is about sticking an array of piezoelectric speakers to the back of a display. edit 2- You're right, the press release is pretty poor at explaining this though. It is not the pixels emitting the sound. It's an array of something like 25 speake…
This is the article that should be the main link- though still an incredibly misleading named technology.
But the current one is just wrong.
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#57I would guess the bass is nonexistent here. Cool idea though.
Not this but similar, Sony’s acoustic surface audio for their displays uses actuators behind the screen to vibrate it. it’s not crazy bass but I’d say it’s on par with regular built in tv/laptop speakers
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#58I guess there are limits, like a pixel should never move more then its size, or you limit resolution (at least from some angels). So deep basses are out of the question? It is getting very interesting, sound, possibly haptics. We already had touch of course, including fingerprint (and visuals of course). We are more and more able to produce richt sensory experiences for panes of glass.
Yeah, I don’t know, I suspect you’re right. I know that 25 years ago there were big flat speakers thay drove sound with little holes. Those things could only handle high ends despite being very large themselves. But I know that with DSP you can treat an array of microphones as a single microphone, and the diameter of the array sort of dictates the size of the microphone. Speakers and mics tend to sort of be opposites, in that you can drive or be driven by either. For years I’ve wanted to build a wall of cheap speakers and experiment with this. I suspect I’d find out what we already know, which is to get deep frequencies you have to move a lot of air, and an array of small piezos can never move a lot of air…
That said, it might matter a lot what the substrait was. If it was light and flexible, you could maybe get all the piezos to move it in a way to get a very deep frequency. You could probably get deeper frequncies than the power output of the piezos by taking advantage of the resonance frequency of the material. But you’d be stuck with that one frequency, and there’d be a tradeoff in response time
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#59That’s super impressive. I guess that would work for a notification speaker. But for full sound I have doubts about the low frequencies. I would assume you would need a woofer anyway in a home setting.
These are a thing: https://hackaday.com/2019/10/26/building-the-worlds-best-dml...
I have built those for an outdoor space. They work surprisingly well for mids to highs
Re: High-quality OLED displays now enabling integrated thin and multichannel audio
#60Could such a display also function as a microphone?
Good point, piezos do also generate voltages when deformed, so this could conceivably be run in reverse... Microphone arrays are already used for directional sound detection, so this could have fun implications for that application given the claimed density of microphones.
You could likely do both at the same time.
The "microphone" would be the measurement of interference between speaker demand and actual response.