Path: ...!weretis.net!feeder9.news.weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Don Y Newsgroups: sci.electronics.design Subject: Re: LCD (large -- TV-ish) monitors with SOLID front surface? Date: Sat, 15 Jun 2024 17:37:44 -0700 Organization: A noiseless patient Spider Lines: 82 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sun, 16 Jun 2024 02:38:38 +0200 (CEST) Injection-Info: dont-email.me; posting-host="10f91bf08e647935c67246fcfb3c014d"; logging-data="3899888"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18aQivMT+J9IsBx2oxT+pYd" User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2 Cancel-Lock: sha1:nj3SmPN1bQwDzzAAmM3hqtMQK10= Content-Language: en-US In-Reply-To: Bytes: 5146 On 6/15/2024 4:22 PM, Jasen Betts wrote: > On 2024-06-14, Don Y wrote: > >> The front polarizer of a typical LCD TV ("really big monitor") tends to >> be flimsy. A thin piece of glass/lexan might work in that it could >> distribute the forces over a larger area -- providing "localized stiffness" >> instead of OVERALL stiffness. >> >> Imagine yourself writing on a whiteboard; your motions tend not to be >> delicate and deliberate but, rather, sharp and erratic. I need to protect >> the LCD display from your "abuse". >> >> At the same time, ensuring that the protective layer doesn't end up scratched >> and cloudy from repeated "markings". >> >>> If it was stiffer than the display glass you'd need to disassemble the >>> display to install the protector. (if wanting to mount it using adhesive) >>> >>> Or else live with a gap between the display and the protector (increasing >>> parallax and potentially collecting debris) >> >> The parallax is disturbing. Your "ink" appears *in* the display but your >> "writing actions" occur outside the protective layer. So, if there's a >> schematic, program listing, photoplot, etc. being displayed on ("in") >> the display, it requires a bit more effort to make your marks where you >> want them, relative to what is already being displayed (and *updated* to >> include your marks). > > Have you switched fron non-visible ink to virtual ink? Do you > actually want a touch sensing screen? The pen that you *hold* has NO ink in it (hence "invisible ink"). I.e., I can scribble on the (current plasma) screen for hours and you would never know where I had scribbled. But, the pen *creates* "virtual ink" that appears in the video signal displayed on ("in") the display. If you start by displaying a white field, then a casual observer thinks he is watching a person scribbling on a real whiteboard (and wondering how the "market pen" keeps changing colors to suit the wishes of the writer). A *touch* screen would be nice but would complicate things in that getting more than one (50-90 inch diagonal) would be costly. My approach allows me to use a screen wherever I happen to be (though this has had to be plasma, to date, due to the ruggedness constraint) A sheet of glass/lexan would actually be ideal as I could arrange to have one of suitable size wherever I happened to be (to fit whatever TV was available)! >> If you think of a TV weatherperson interacting with a green-screen, >> you can get a sense of how that sort of awkward interface affects >> the precision of their annotations (anything "exact" is done off-line >> where it can be revised over time; live updates tend to be really crude, >> by comparison). > > These days they use actual displays instead of chromakey. Sometimes > even touch sensing displays; there's funny videos of the presenters > discovering this: eg. https://www.youtube.com/watch?v=0Goz0PnhEg8 They are still green (or blue)-screens, here (local). The presenter is always looking off to (e.g.) stage left to see the composite signal that is being broadcast (i.e., with HIM/HER *in* it) to verify that he/she is pointing and gesturing appropriately. National broadcasters use more sophisticated displays. >> If parallax is the only option, I can use an alternate technology that >> eliminates it -- in favor of other shortcomings. :< >> >> [I *really* don't want to use another plasma TV as they throw off >> a lot of heat so you can't ALSO use them as a practical TV (which >> would eliminate the need to STORE the thing when not in use!)] > > Not knowing your actual requirements I'm going to refrain > from making specific suggestions.