Projectors used to be popular for small- to medium-sized meeting rooms and classrooms, but that niche is quickly being taken over by large flat-panel displays. And with good reason: For the buck, flatpanel displays have higher resolution, better speakers and are generally less fussy than projectors.
JVC DT-V24G1Z vectorscope
by Bob Kovacs
One thing is certain: CRT monitors are being pushed out of classrooms, meeting rooms and control rooms by various flat-panel technologies. You can still buy a CRT monitor for a special task but the end of the line is in sight for CRTs.
“I’d be hard-pressed to select a CRT over a flat-panel unit, even given the advantages conventional CRTs still have over LCDs in colorimetry and viewing angle,” said Jim Stanley, director of engineering for WLKY in Louisville, Ky. “As of now, we no longer repair CRT monitors; we replace them with flat-panels as they fail.”
The larger size and greater flexibility of largescreen displays is quickly making them the choice for government facilities of all sorts, from airports to council rooms. Multiviewers can divide a single large-screen display into 16 or more independent monitors, which is makes for greater flexibility in control rooms and monitoring locations. Flexibility is also necessary, such as novel ways to mount and connect signals to monitors.
Wohler Presto Front Panel “In the past, we had precision monitors for critical applications, confidence monitors for where you just need to confirm a signal’s presence, and regular television sets for office and general off-air viewing,” Stanley said. “With the advent of flat-panels and HD, I think these distinctions have largely blurred. We use HDMI inputs on consumer-grade flat-panel sets (along with small SDI-to-HDMI converters) to provide low-cost monitoring that works surprisingly well for a variety of applications.”
BIGGER IS BETTER
The technology for large flat-panel displays has typically been plasma, although large LCD displays started reaching the market three or four years ago. Both LCD and plasma have their advantages, and plasma typically provides the widest viewing angles and richest contrast.
“Our 1080P 50-, 58- and 65-inch professional plasma displays are the most popular displays for our government customers,” said Rick Albert, vice president for flat panel displays at Panasonic Solutions Co. “They are purchasing them for multiple applications, but most recently the bigger projects are for training and classrooms where they are replacing projectors.”
JVC’s GM-F470S monitor is a 47-inch LCD model with a very thin bezel that works well for video walls. The GM-F470S has a wide viewing angle and is designed for 24/7 operation.
The Vérité G-Series from JVC has two monitors to support Verite standard 2D production, but with added flexibility. The 17-inch DT-V17G1Z and 24-inch DT-V24G1Z have built-in waveform/vectorscopes, audio level metering and LTC/VITC timecode support, among many features.
“Our new top-of-the-line DTV displays are the Vérité G-Series, which feature 3G, dual-link HD/SDSDI inputs with 1080p/60 capability and digital closed captioning,” said Dave Walton, assistant vice president of marketing and communications for JVC Professional Products.
A number of manufacturers have released professional monitors using organic light-emitting diode (OLED) technology, which has several advantages over typical liquid crystal display (LCD) designs. With an OLED display, the viewing surface is actually creating the light that forms the image, instead of using a backlight that LCD requires.
This means that OLED monitors can be really thin and they usually have a very wide viewing angle. Being thin also means that OLED monitors are lightweight.
On the downside, OLED displays are more expensive to manufacture than LCDs, particularly at larger sizes, and the current technology for OLED generally has a shorter life than LCD monitors. OLED can also be susceptible to burn-in, so manufacturers use an “orbiting‚” technology similar to that on plasma displays.
Marshall Electronics has a wide variety of monitors in its Modular Design (MD) series, all of which have the ability to connect to a range of input signals depending on the supplied I/O modules. This includes composite, component, SDI, HDMI, DVI and even fiber-optic modules. For example, the Marshall V-MD151-OLED is 15-inch desktop OLED monitor that can support any of the company‚Äôs input modules.
"It's definitely a future-proof solution,” said Mark Fisher, marketing manager for Marshall Electronics.
TVLogic has two new models that take monitor technology in a couple different directions simultaneously, with the recent announcement of a 15-inch OLED field-production monitor, the LEM-150. The company also unveiled a 56-inch 4K high-resolution cinema post-production monitor, the LUM-560W, which has a screen resolution of 3840x2160.
“The LEM-150 is ideal for critical field/camera monitoring and on-set color grading,” said Wes Donahue, marketing director for TVLogic USA. “And the LUM-560W is designed for military and surveillance applications requiring a full-featured color-calibrated 4K display.”
Ikegami is one of the few manufacturers that still makes CRT monitors, but its most recent monitor announcements have been for LCD models. One example is the HLM-1750WR, a 17-inch 1080p/60 display with a wide viewing angle and fast response time. Unlike some specialty video production monitors, the HLM-1750WR also works as a computer monitor.
“The HLM-1750WR features a USB port for transferring set-up files, wireless mouse control and auto-set-up probe connection,” said Alan Keil, vice president and director of engineering for Ikegami Electronics. “The space-saving rackmount design of the HLM-1750WR is another advantage for production control rooms.”
Wohler Technologies makes a number of flatscreen monitors, mostly for rackmount and portable applications. However, the Presto 1RU is something different: It’s a 16x1 routing switcher with a tiny OLED screen on each input button displaying the signal on that input.
“No longer do you have to guess if you are selecting the correct feed, bars or even black,” said Jeff McNall, director of product development for Wohler. “Within each selector button is an OLED video display that has great contrast, brilliant colors and no viewing angle barriers.”
As HD settles in as the standard for production and display, nothing is more important than seeing exactly what is contained in your signals. A precision evaluation monitor can seem like a luxury when you have so many monitors with great pictures, but it can also show you at a glance what other monitors may hide.
The BVM-L231 23-inch critical evaluation LCD monitor from Sony has new optics and 3G input capability, and it is calibrated to SMPTE C, EBU and ITU-R.BT709 standards. It even has the ability to grab a still image in TIFF format from the displayed video, so that the image can be evaluated elsewhere.
For less-critical production applications, Sony’s line includes the PVM-740, a 7.4-inch OLED monitor for rugged field use. Typical of OLED monitors, its picture contrast is greater than a CRT display, and is less affected by ambient light—a special coating provides protection from scratches and enables a high transmission rate of the internal light source to keep the picture as bright as possible.
“Customers have been asking for the next great display technology, and for color correction and critical picture evaluation, OLED delivers everything they need and much more,” said Gary Mandle, senior product manager for professional displays at Sony Electronics.
The PRM-3G Precision LCD series from Plura Broadcast is built with Grade A LED backlight LCD panels that provide accurate rendition of more than 1 million colors for monitor-critical applications. The monitors in this series also have wide viewing angles, on-screen waveform/vectorscopes, closed captions and audio metering.
As diverse as LCD and OLED monitors are, they still fall short of CRTs in at least one respect.
“Our plant, like many others, uses a mix of both standard-definition and HD signals, and the multisync capability of conventional CRTs makes a sharp picture in both SD and HD,” WLKY’s Stanley said. “Flat-panel monitors have a challenge with this, given the fact that their native resolution is fixed. A flat-panel monitor that could provide a truly sharp picture across multiple signal resolutions is something I’d really like to see.”
There’s a lot to see in monitors today and many choices to make. One thing is certain: Monitors have never been as capable as those available today and government video users are finding advantages to the newer large-screen models.
With large-screen LCD and plasma units, LED backlit models and OLED technology starting to move into the display mainstream, it looks like monitors will be interesting for some time.
Bob Kovacs can be reached firstname.lastname@example.org.