AUO 71″ 21:9 Display

May 9th, 2011 James Henry No comments

As noted in Engadget AUO will be making a 71″ panel with an aspect ratio of 21:9. From the write up it seems clear that this is being targeted at the consumer market  but assuming this may be available in non-3D versions it should be of interest to the signage and other markets.

The display was shown as a consumer TV at the China Optoelectronics Display Expo 2011 with passive 3D, 240Hz refresh and a noted August 2011 release. Here is the Engadget blog link: http://www.engadget.com/2011/05/08/auos-71-inch-ultra-wide-3d-lcd-panel-eyes-on/

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Do LCD Panels Suffer From Burn-In?

November 6th, 2010 admin 1 comment

Shortly after large screen plasma screens first came to market and started being used for signage there were reports of problems with burn-in. This had also been a problem with CRTs used in similar applications. But what about LCDs?

Clearly LCDs are immune to the phosphor burn-in of Plasma panels and CRTs but they are vulnerable to a similar looking image retention when a static picture is maintained for an extended period. As a result some panel manufacturers provide recommendations for applications like digital signage where parts of the image such as borders may be effectively static. This includes things such as:

  • Operating the panel at around median temperatures within the specified range.
  • Seek to change the image regularly and/or change the colors of the static areas.
  • Avoid extremes of image contrast in the design of the media.
  • Power down the display after a certain period, one manufacturer recommends operating for less than 12 hours per day.

So it seems the answer is yes, there is a risk of image retention for panels with extended operating times and static elements to the images being displayed.

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LCD Panels With Wide Operating Temperature

November 3rd, 2010 admin No comments

Most LCD panels on the market have a specified operating temperature range of around zero to 50 degrees Centigrade however there are quite a number of environments where LCD panels are required to operate outside this range. For example many countries or regions spend a considerable part of their winter with temperatures below zero and and the other end of the scale the temperature inside a display enclosure could easily exceed 50 degrees C if there are other components running hot, or there are high ambient temperatures or a lack of available cooling.

To meet the needs of the more extreme environments Optrex offer a range of LCD panels up to 17″ with operating temperatures from -30 to +80 degrees C. Details of these panels can be found on www.optrex.com.

Optrex Banner Type LCD – 19.2″

October 28th, 2010 admin No comments

Following on from the blog on 29 September 2010 about banner type LCDs we now have details of a 19.2″ panel from Optrex with a resolution of 1920×360, an aspect ratio of 16:3. As with many of the Optrex panels this has the distinguishing feature of a -30 to +80 degree C operating temperature.

The LCD is TN type with an edge-lit LED backlight.
Model: T-55604D192J-LW-A-AAN

Panel Database On iPhone

October 26th, 2010 admin No comments

Digital View have migrated the PanelX LCD panel database to an iPhone version, this is available for free from iTunes though you can see details  here. An updated version will be available soon providing a database update function followed by more advanced filtering.

In part this app was done for fun and as an exercise preceding a few other mobile applications but hopefully it is also useful. Suggestions for improvement are always welcome.

Banner Type LCD Panels

September 29th, 2010 James Henry No comments

Display system builders looking to produce a very wide banner type LCD display (also called bar type) do not have a lot to choose from right now. I am only aware of the Samsung LTI430LA01 which is a 43″ with a resolution of 1920×480 giving a 4:1 aspect ratio, it is a very impressive panel. There is something about this size and shape that makes it very appealing for applications like digital signage, it has a presence and novelty value. It is also looks great when used in portrait mode.  Of course it requires custom content but my view is that most good digital signage does anyway.

I am told that there is or will be a panel from LG in this category but I am not aware of availability. If there are other models in this category I will update this note.

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Sourcing An LCD Panel

September 25th, 2010 James Henry No comments

Selecting and sourcing a panel can be a challenging task as there are quite a few issues to consider:

  • Features: Size, resolution, viewing angle, response time, refresh rate, contrast, color gamut, temperature range, backlight type, shock & vibration rating, pixel defect rate, power consumption, heat, age.
  • Availability both now and in the future. There is both the issue of sales channels as well as a manufacturers life cycle.
  • Price.

To assist in this there is the PanelX LCD panel database that we will continue to improve as a reference. In addition we have now released manufacturers directory and again it is something that will be progressively improved. On top of that we have a few more resources planned including the inevitable mobile device versions though these may be released under the Digital View name.

We welcome ideas and feedback as well as any data updates.

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Panel Connections: LVDS , TTL

September 22nd, 2010 James Henry No comments

LCD panel modules sold for industrial and commercial applications typically have a TTL or LVDS type signal connection. The following considers each of these:

  • TTL is from my perspective the original type of panel signal connection. The signal is parallel and is frequently still found in use on panels up to SVGA (800×600) resolution though a few XGA (1024×768) and SXGA (1280×1024) are probably still available.
  • LVDS was introduced in the 1990′s and is now the common type of signal connection for higher resolution panels. The LVDS (Low Voltage Differential Signaling) type connection produces less radiated interference and requires less physical wires than TTL.

One important thing to note however it that the TTL or LVDS connection on a panel is not necessarily going to have the same characteristics as on another panel model, even if from the same manufacturer.

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Repairing The Display In A Laptop

September 19th, 2010 James Henry No comments

This is a topic that has come up very many times over the years together with the alternative topic of how to use the display out of a laptop to make an LCD monitor.

The simple answer is that the display used in a laptop is very unlikely to be available as a standard panel model such as those listed in the PanelX database. Or if it is then trying to determine the model may be very difficult as the laptop assembly house may relabel the panels with a new model number for their own purposes.

Without knowing the model and specifications then:

  • In the case of repair, it is usually not possible to simply replace a panel with a mechanically compatible alternative. The power and signals are extremely likely to be different.
  • In the case of using a working panel to build a display system then connecting a controller and power supply is a risky or even impossible task. For anyone who can identify the model & specifications and is willing to try then companies like Digi-Key and Mouser are usually willing and able to sell single unit controller kits.

Another factor is that very high volume assemblies may use bonded flex cables that are very hard to work with manually.

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Looking At Panel Specs Carefully…

September 16th, 2010 James Henry No comments

Following the blog ‘Building an LCD display system’ it was suggested that I comment again on the topic of specifications. Back on 3 September 2010 the topic of very high contrast ratios was addressed, this time the issue is that a single specification should not be considered in isolation and all the specs need to be reviewed in the context of the intended application.

The point that attracted attention was the note re a 90 degree viewing angle, aside from the physical impracticality of such a claim, eg 89 degrees is more reasonable, looking at the specifications more closely reveals that the contrast ratio at the extreme to be 10:1. That is very different from that panel’s nominal 450:1 contrast ratio which would likely be at straight-on viewing (zero degrees). The point is that the benefit of that viewing angle would be the ability to see that there was an image on the display – this may indeed be of value – it may also permit high contrast alerts to be visible from an extreme angle. The benefit would be application specific.

Looking yet further at the spec of this particular panel the response time is over 30ms. This is too slow for high frame rate video (TV panels now all quote sub 10ms) but quite suitable for many instrumentation applications where the graphics move more slowly.

We will keep revisiting specifications as a topic.

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