Viki Lcd

Posted : admin | On 21-04-2021



A generic LCD TV, with speakers on either side of the screen

Wiki Lcd Soundsystem

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Liquid-crystal-display televisions (LCD TVs) are television sets that use liquid-crystal displays to produce images. They are, by far, the most widely produced and sold television display type. LCD TVs are thin and light, but have some disadvantages compared to other display types such as high power consumption, poorer contrast ratio, and inferior color gamut.

LCD TVs rose in popularity in the early years of the 21st century, surpassing sales of cathode ray tube televisions worldwide in 2007.[1] Sales of CRT TVs dropped rapidly after that, as did sales of competing technologies such as plasma display panels and rear-projection television.

7inch Resistive Touch LCD (C) 7inch Resistive Touch LCD; 4.3inch 480x272 Touch LCD (B) 4.3inch 480x272 Touch LCD (A) 4.3inch Capacitive Touch LCD; 4inch Resistive Touch LCD; 3.2inch 320x240 Touch LCD (C) 2.8inch Resistive Touch LCD; 2.4inch LCD Module; 2.2inch 320x240 Touch LCD (A) 2inch LCD Module; 1.3inch Memory LCD; 1.3inch LCD Module. ViKi LCD mounting bezel done in Sketchup, with a second back piece to make it a freestanding case. Use the bezel Sketchup file as a starting point for you own custom mount, or print both STL files and use together for a case.

History[edit]

An LCD TV hanging on a wall in the Taipei World Trade Center during the Computex Taipei show in 2008.

Early efforts[edit]

Passive matrix LCDs first became common as portable computer displays in the 1980s, competing for market share with plasma displays. The LCDs had very slow refresh rates that blurred the screen even with scrolling text, but their light weight and low cost were major benefits. Screens using reflective LCDs required no internal light source, making them particularly well suited to laptop computers. Refresh rates of early devices were too slow to be useful for television.

Portable televisions were a target application for LCDs. LCDs consumed far less battery power than even the miniature tubes used in portable televisions of the era. In 1980, Hattori Seiko's R&D group began development on color LCD pocket televisions. In 1982, Seiko Epson released the first LCD television, the Epson TV Watch, a small wrist-worn active-matrix LCD television. Sharp Corporation introduced the dot matrix TN-LCD in 1983, and Casio introduced its TV-10 portable TV.[2] In 1984, Epson released the ET-10, the first full-color pocket LCD television. That same year Citizen Watch introduced the Citizen Pocket TV, a 2.7-inch color LCD TV, with the first commercial TFT LCD display.

Throughout this period, screen sizes over 30' were rare as these formats would start to appear blocky at normal seating distances when viewed on larger screens. LCD projection systems were generally limited to situations where the image had to be viewed by a larger audience. At the same time, plasma displays could easily offer the performance needed to make a high quality display, but suffered from low brightness and very high power consumption. Still, some experimentation with LCD televisions took place during this period. In 1988, Sharp introduced a 14-inch active-matrix full-color full-motion TFT-LCD. These were offered primarily as high-end items, and were not aimed at the general market. This led to Japan launching an LCD industry, which developed larger-size LCDs, including TFT computer monitors and LCD televisions. Epson developed the 3LCD projection technology in the 1980s, and licensed it for use in projectors in 1988. Epson's VPJ-700, released in January 1989, was the world's first compact, full-color LCD projector.

Market takeover[edit]

Viki LcdViki Lcd

In 2006, LCD prices started to fall rapidly and their screen sizes increased, although plasma televisions maintained a slight edge in picture quality and a price advantage for sets at the critical 42' size and larger. By late 2006, several vendors were offering 42' LCDs, albeit at a premium price, encroaching upon plasma's only stronghold. More decisively, LCDs offered higher resolutions and true 1080p support, while plasmas were stuck at 720p, which made up for the price difference.[3]

Predictions that prices for LCDs would rapidly drop through 2007 led to a 'wait and see' attitude in the market, and sales of all large-screen televisions stagnated while customers watched to see if this would happen.[3] Plasmas and LCDs reached price parity in 2007, with the LCD's higher resolution being a 'winning point' for many sales.[3] By late 2007, it was clear plasmas would lose out to LCDs during the critical Christmas sales season.[4][5] This was in spite of plasmas continuing to hold an image quality advantage, but as the president of Chunghwa Picture Tubes noted after shutting down their plasma production line, '(g)lobally, so many companies, so many investments, so many people have been working in this area, on this product. So they can improve so quickly.'[3]

Viki Lcd

When the sales figures for the 2007 Christmas season were finally tallied, analysts were surprised to find that not only had LCD outsold plasma, but CRTs as well, during the same period.[1] This development drove competing large-screen systems from the market almost overnight. Plasma had overtaken rear-projection systems in 2005.[6] The same was true for CRTs, which lasted only a few months longer; Sony ended sales of their famous Trinitron in most markets in 2007, and shut down the final plant in March 2008.[7] The February 2009 announcement that Pioneer Electronics was ending production of the plasma screens was widely considered the tipping point in that technology's history as well.[8]

LCD's dominance in the television market accelerated rapidly.[3] It was the only technology that could scale both up and down in size, covering both the high-end market for large screens in the 40 to 50' class, as well as customers looking to replace their existing smaller CRT sets in the 14 to 30' range. Building across these wide scales quickly pushed the prices down across the board.[1]

In 2008, LCD TV shipments were up 33 percent year-on-year compared to 2007 to 105 million units.[9]In 2009, LCD TV shipments raised to 146 million units (69% from the total of 211 million TV shipments).[10]In 2010, LCD TV shipments reached 187.9 million units (from an estimated total of 247 million TV shipments).[11][12]

Larger size displays continued to be released throughout the decade:

  • In October 2004, Sharp announced the successful manufacture of a 65' panel.
  • In March 2005, Samsung announced an 82' LCD panel.[13]
  • In August 2006, LG.Philips LCD announced a 100' LCD television[14]
  • In January 2007, Sharp displayed a 108' LCD panel under the AQUOS brand name at CES in Las Vegas.[15]

Competing systems[edit]

In spite of LCD's dominance of the television field, other technologies continued to be developed to address its shortcomings. Whereas LCDs produce an image by selectively blocking a backlight, organic LED, microLED, field-emission display and surface-conduction electron-emitter display technologies all produce an illuminated image directly. In comparison to LCDs all of these technologies offer better viewing angles, much higher brightness and contrast ratio (as much as 5,000,000:1), and better color saturation and accuracy. They also use less power, and in theory they are less complex and less expensive to build.

Manufacturing these screens proved to be more difficult than originally thought, however. Sony abandoned their field-emission display project in March 2009,[16] but continued to work on OLED sets. Canon continued development of their surface-conduction electron-emitter display technology, but announced they would not attempt to introduce sets to market for the foreseeable future.[17]

Samsung announced that 14.1 and 31 inch OLED sets were 'production ready' at the SID 2009 trade show in San Antonio.[18]

See also[edit]

  • Ambilight, Philips Electronics technology
  • Quattron, an LCD TV technology from Sharp which utilizes a fourth pixel color, yellow
  • Thin-film-transistor liquid-crystal display, a detailed discussion of LCD panels technology

References[edit]

  1. ^ abcGruener, Wolfgang (19 February 2008). 'LCD TVs outship CRT TVs for the first time'. TG Daily. Archived from the original on 26 February 2008.
  2. ^'Frank's Handheld-TVs: Part 1'.
  3. ^ abcdeReuters, 'Shift to large LCD TVs over plasma', MSNBC, 27 November 2006
  4. ^Phillip Swann, 'Sam's Club CEO: LCD Will Surpass Plasma'Archived 2010-11-21 at the Wayback Machine, TVPredictions, 29 October 2007
  5. ^'Archived copy'. Archived from the original on 2007-03-04. Retrieved 2007-01-14.CS1 maint: archived copy as title (link)
  6. ^'Plasma TV sales overtake projection units, says report'EETimes, 17 August 2005
  7. ^MarketWatch, 'Sony to stop making old-style cathode ray tube TVs', Wall Street Journal ', 3 March 2008
  8. ^Jose Fermoso, 'Pioneer’s Kuro Killing: A Tipping Point in the Plasma Era', newteevee.com, 21 February 2009
  9. ^Flat Panel TV Sales Dropped in Q4 2008, February 18, 2009, Geoff Duncan, Digital Trends, retrieved at September 12, 2011
  10. ^Global LCD TV Shipments Reached 146M Units in 2009, Faster Growth Than 2008, February 22, 2010, Display Search, retrieved at September 12, 2011
  11. ^LCD TV Market Ten Times Larger Than Plasma TVs On Units-Shipped Basis, 20 February 2011, Jonathan Sutton, hdtvtest.co.uk, retrieved at September 12, 2011
  12. ^Global LCD TV Market to Grow 31% in 2010, Slowing to 13% in 2011, January 3, 2011, retrieved at September 12, 2011
  13. ^'Samsung Develops World's Largest (82') Full HDTV TFT-LCD'. Mar 7, 2005. Archived from the original on 2005-03-13.
  14. ^Philips Press Release
  15. ^'Sharp Unveils 108-Inch Flat-Panel TV'. Fox News. 8 January 2007.
  16. ^'Sony's Field Emission Technologies closing its doors', Engadget
  17. ^Robin Harding, 'Canon clear to launch new type of TV', Financial Times, 2 December 2008
  18. ^''SMD unveils production ready OLED-TVs and AMOLEDs at SID 2009''. Archived from the original on 2010-07-20. Retrieved 2009-06-01.

External links[edit]

Wikimedia Commons has media related to LCD television sets.
  • Chemicals to fabricate LCD television are distributed by Merck Group (DE), and Yancheng Smiling (CN).
Retrieved from 'https://en.wikipedia.org/w/index.php?title=LCD_television&oldid=950670282'

Still playing catch-up with the updates. But here we go. First up, got the VIKI LCD working, after scouring the web on how to get this wired up with the azteeg x3 + marlin. The buttons all seem to do the same thing, but the encoder works, and the display works. It appears the support in marlin is minimal so this isn’t so bad.

Viki Lcd

Next I got the Helios heated bed mounted. The parts from panucatt shipped with some good insulation to stick underneath of it. So did that part.

Then I cut some glass, I found a glass cutter and a sheet of replacement glass for picture frame. Cut it down to about 8×8. This was my first time cutting glass so I’ll most likely buy another one and do it again, as I cut it a little too short. After I was done cutting I sanded the edges with sandpaper just to keep myself from bleeding all over the place.

I know everyone loves binder clips, but this is all I had, so I’m using these clips for now until I get some binder clips. The binder clips don’t stick out as much so I do want to do that. Here’s the board mounted.

At this point I mounted all the limit switches and wired them up. It appears to me most people building these mount the z home switch towards the bed. I feel like that is an odd thing to do, because you will constantly have to tweak that so people make a mount with a screw so they can finely dial it in. I remember using the Makerbot Thing-O-Matic and it homed it’s z on the limit then in software knew its height and could be set via software. So I went that route. I mounted the Z on the limit, then I set the height via repeteir and it knows where 0 is based off of that. This way I can tune it into fractions to get the z where I want without physically tweaking something.

Viki Lcd I2c

From there it’s just twist more wires, and fire it up. I’m actually amazed at how long the bed takes to heat up. I have the thermistor snugly against the glass in the center so I’m reading the glass temp. But it takes quite awhile to warm up. I think I’m going to throw down some transistor grease between the glass and the bed to see if that improves. For now we will go with it.

There it is folks. The first print. Obviously I didn’t set my extrusion rate properly. So cancel that. And lets try again.

And boom. Now that’s a pretty print. Yeah I know it’s lopsided. That was because I actually didn’t tighten the belts before I started. So I was tightening them while it was printing. Otherwise it’s a great looking print for #2.

Now that everything is working properly, it’s time to fix the wires, and then I can go back to dialing in that picture perfect print.