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Will this be using PWM like almost all OLED screens for dimming? I feel that the answer is probably yes and it's quite frustrating. But my wants are probably a
by aiilns 5y ago
Will this be using PWM like almost all OLED screens for dimming? I feel that the answer is probably yes and it's quite frustrating.
But my wants are probably a bit different than everyone else's: ideally a touch (w/ pen input), high resolution (integer scaling), matte monitor that uses DC dimming.
I've lost hope on such a thing existing (closest thing I have seen is the latest thinkpad yoga x1, gen6 I think, I'd be into buying just the screen, but not really possible). Instead I'm hoping for better e-ink panels which will be even better by eliminating backlight completely.
- Ballas 5y agoWhat is the matter with PWM dimming? Would it be resolved by using a higher frequency for PWM? The main reason you use PWM for dimming LEDs is because DC dimming (or filtered PWM) causes color shift. By using PWM, you can drive the LEDs with the same current, but effectively switching them on and off. Driving LEDs at different currents produce slightly different color outputs.
- marcosdumay 5y agoA PWM with a capacitor and a load is an adjustable DC supply. What problems are you having with it?
- neogodless 5y agoI may be an edge case, but after getting a concussion, all my screens need to be higher refresh rate. 144hz works; my phone is 90Hz and it's borderline. But more importantly they all use DC dimming. Had to sell a laptop with PWM dimming. I suspect others are just sensitive to it (sans concussion) and prefer DC dimming.
- NavinF 5y agoPWM+capacitor is not an adjustable DC supply. You also need an inductor to do that: https://electronics.stackexchange.com/a/31714/15654 https://electronics.stackexchange.com/a/31714/15654 Of course the wires have resistance so it would technically “work” as an RC filtered PWM until it overheats. PWM dimming means turning the LEDs on and off without any smoothing.
- deleted 5y ago[deleted]
- ksec 5y ago>Will this be using PWM like almost all OLED screens for dimming? But the article is about Mini LED LCD?
- aiilns 5y agoYeah sorry. Most LCDs, at least up to a couple of years ago, use PWM for dimming & all OLED do AFAIK. I don't know much, to know if mini LEDs dimming in different sections mean PWM, but I suppose they might since it would be probably easier to change the speed of the rapid on&offs of some LEDs rather than the current to dim part of the screen.
- chrismorgan 5y agoDo you get touch (with or without digitiser) and matte? I don’t recall ever having seen the combination outside of e-paper devices like reMarkable, though it certainly could exist and I just haven’t seen it. I know there are after-market solutions for things like iPads where you stick an extra sheet on top, screen protector style. I have no idea how pleasing they are.
- aiilns 5y agoLook at thinkpad x1 yoga gen 6 for matte with touch & pen input. And other non yoga thinkpads have had matte with a touchscreen.