What is the difference between LCD viewing angle and bias angle?
How does adjusting the LCD bias voltage effect the display?
What is LCD Ghosting?
Also a demonstration of Photoelastic Birefringence in polycarbonate plastic display covers.
Dave investigates the Liquid Crystal Display viewing angle problem in the EEVblog BM235 Multimeter.
Awesome! Thanks for trying it.
Very nice Dave! For your customers, will it void their warranties if they choose to change the bias resistor?
I'm tempted to do this for my Greenlee DM-510A, but I'm almost certain the warranty will be void if I do.
Good one Dave , i dunno where you find the time .
You forgot though to turn on the backlight at the end to see what happens .
You forgot though to turn on the backlight at the end to see what happens .
Yep, I forget a lot of things.
Very nice Dave! For your customers, will it void their warranties if they choose to change the bias resistor?
Not unless the mod demonstrably caused the fault.
Good to know.
Then again, people who purchase a product like this are more likely to have the skills to make such a mod. I know I could - but, at the moment, I have no plans to fix the backlight buzz nor contrast. This might change if a situation arises where there is a clear benefit - but I'm not into mods for the sake of mods.
Good to know.
Then again, people who purchase a product like this are more likely to have the skills to make such a mod. I know I could - but, at the moment, I have no plans to fix the backlight buzz nor contrast. This might change if a situation arises where there is a clear benefit - but I'm not into mods for the sake of mods.
I won't bother modding my own lab units, doesn't cause an issue for me.
The polarizing effect is due to the crystallization of the plastic housing, polarizing filters are used to check for the internal stresses and melt flow properties of these kinds of plastics, if you look at the effect through the filter, you can actually see it shows where the injection moulded fill points where (the gates), but normally you would not see this at all unless you are looking through a polarized filter, such as sunglasses, etc.
I think I will have a look at my one and decide if I should replace that resistor or not.
Wov !!
Dave made a demo of the Davecad V2.0 in this video, with animation features !
Innovation in the CAD field
I hope this V2.0 will be released soon
Dave made a demo of the Davecad V2.0 in this video, with animation features !
Innovation in the CAD field
I hope this V2.0 will be released soon
Big announcement video coming shortly, I've sold DaveCAD to a large CAD company who shall remain nameless right now. Will post it from my new private island.
I am in awe of the new DaveCAD transparent animation plugin. Patent it before Solidworks steal it for themselves!
Sorry I didn't comment earlier, but I, too, was impressed by the animation plugin!
Looks like it can handle multiple layers as well. Impressive.
Dave made a demo of the Davecad V2.0 in this video, with animation features !
Innovation in the CAD field
I hope this V2.0 will be released soon
Big announcement video coming shortly, I've sold DaveCAD to a large CAD company who shall remain nameless right now. Will post it from my new private island.
Altium owned an ISLAND, too?
39k on my two units, 20k was an improvement, but 39k much better.
Trap for Young Players: When purchasing a device for outdoor use, always take it outdoors and view it while wearing your polarized sunglasses!
Way too many displays need to be turned sideways to be legible when wearing polarized glasses. I haven't seen the problem in my recent multimeters, but it was present in some older ones.
The first Android phone I purchased, an LG L9, worked great outdoors at all orientations (I still need to figure out how they pulled that one off). But I forgot to check my next phone, a Samsung Galaxy Avant, and it turned out to be viewable only in portrait orientation, which fortunately works fine for Google Maps, but not for any of my fitness tracking apps. Arrgh!
Trap for Young Players: When purchasing a device for outdoor use, always take it outdoors and view it while wearing your polarized sunglasses!
Way too many displays need to be turned sideways to be legible when wearing polarized glasses. I haven't seen the problem in my recent multimeters, but it was present in some older ones.
The first Android phone I purchased, an LG L9, worked great outdoors at all orientations (I still need to figure out how they pulled that one off). But I forgot to check my next phone, a Samsung Galaxy Avant, and it turned out to be viewable only in portrait orientation, which fortunately works fine for Google Maps, but not for any of my fitness tracking apps. Arrgh!
That's because some of them use 45-degree polarisation while others are 0/90.
http://electronics.stackexchange.com/questions/28113/why-are-lcd-panels-polarized-at-45-degreesAnd of course those using OLED will be visible at any angle.
Trap for Young Players: When purchasing a device for outdoor use, always take it outdoors and view it while wearing your polarized sunglasses!
Way too many displays need to be turned sideways to be legible when wearing polarized glasses. I haven't seen the problem in my recent multimeters, but it was present in some older ones.
Yes, the polarization experiment needs to be done before purchase.
An aside.... I remember walking down the street one day wearing my polarized sunnies when I spotted a woman walking in the opposite direction wearing hers. The only trouble was, with her glasses one lens was clear and the other was black and a quick tilt of my head confirmed hers were polarizing. I expect one of the lenses had been put in 90º out of whack - which was possible because they were perfectly circular. I wonder if she ever had a glare problem with her left eye.......
Trap for Young Players: When purchasing a device for outdoor use, always take it outdoors and view it while wearing your polarized sunglasses!
Way too many displays need to be turned sideways to be legible when wearing polarized glasses. I haven't seen the problem in my recent multimeters, but it was present in some older ones.
Yes, the polarization experiment needs to be done before purchase.
An aside.... I remember walking down the street one day wearing my polarized sunnies when I spotted a woman walking in the opposite direction wearing hers. The only trouble was, with her glasses one lens was clear and the other was black and a quick tilt of my head confirmed hers were polarizing. I expect one of the lenses had been put in 90º out of whack - which was possible because they were perfectly circular. I wonder if she ever had a glare problem with her left eye.......
She'd probably see the same thing and wonder why
your glasses had the lenses wrong...
Trap for Young Players: When purchasing a device for outdoor use, always take it outdoors and view it while wearing your polarized sunglasses!
Way too many displays need to be turned sideways to be legible when wearing polarized glasses. I haven't seen the problem in my recent multimeters, but it was present in some older ones.
The first Android phone I purchased, an LG L9, worked great outdoors at all orientations (I still need to figure out how they pulled that one off). But I forgot to check my next phone, a Samsung Galaxy Avant, and it turned out to be viewable only in portrait orientation, which fortunately works fine for Google Maps, but not for any of my fitness tracking apps. Arrgh!
Yeah! Trap indeed. This is something a lot of marine instrument manufacturers still need to learn. On my boat, when wearing polarizing sunglasses (practically all the time, when it's not dark around) I need to constantly tilt my head back and forth to either see the depth sounder or the autopilot display.
But I've been to cars, where various displays, like radio and A/C did not have the same polarization, so one of them was always black in polar glasses.
And of course those using OLED will be visible at any angle.
For OLEDs itself this is true, but there are sometimes polarizers added to the display to reduce glare.
Trap for Young Players: When purchasing a device for outdoor use, always take it outdoors and view it while wearing your polarized sunglasses!
Way too many displays need to be turned sideways to be legible when wearing polarized glasses. I haven't seen the problem in my recent multimeters, but it was present in some older ones.
Yes, the polarization experiment needs to be done before purchase.
An aside.... I remember walking down the street one day wearing my polarized sunnies when I spotted a woman walking in the opposite direction wearing hers. The only trouble was, with her glasses one lens was clear and the other was black and a quick tilt of my head confirmed hers were polarizing. I expect one of the lenses had been put in 90º out of whack - which was possible because they were perfectly circular. I wonder if she ever had a glare problem with her left eye.......
She'd probably see the same thing and wonder why your glasses had the lenses wrong...
Not sure about that. Her left eye would see my glasses as being black on both sides and her right would see them as clear. With binocular vision, these two images would be overlaid in the brain and the problem would not be immediately obvious.
Her left eye, however, would not have been getting the protection of polarizing filtering in the normal plane.