• TV TECHNOLOGY
  As you probably already know, there are several TV technologies available.  LCD televisions are thin and lightweight with a high-quality picture, even in brightly lit rooms.  Plasma screens are heavier than LCDs but may deliver a slightly picture in dark rooms with more intense colors.  DLP TVs offer brilliant screens, but are thicker than LCDs or Plasma.
• RESOLUTION
  Think about TV resolution as the number of pixels contained in one "frame" of a television show or movie.  More pixels in each frame will give you better picture detail.  720P and 1080P are the two most common resolution standards for HDTV now.  With about 1 million pixels in each frame, 720P provides a vivid, high definition picture. 1080P offers the highest level of HDTV quality with over 2 million pixels in each frame, creating even greater picture details.  While broadcast is mostly limited to 720P, 1080P is the standard for high definition disc players like Blu-Ray.
• CONTRAST RATIO
  Contrast ratio is a number that measures the difference in light intensity between the brightest white and the darkest black on the screen.  In general the higher the contrast ratio number, the better the image quality.  Most times, you will find Dynamic Contrast Ratio specified, but be sure you are comparing the same type of contrast ratio.
• CONTRAST ENHANCEMENT
  Another way to improve contrast ratio is with contrast enhancement technology. Most of the time, this uses back lighting to improve apparent contrast.  This is especially helpful in dark rooms, as it helps your eyes adjust to the best light levels.  This dynamically improves contrast, resulting in deep blacks in darker scenes without losing fine details in shadows and other dark areas of the picture.
• BIT COLOR
  Another important contributor to picture quality is what is called "bit depth".  This is the size of the number that is used to assign colors on the screen.  The higher the number, the more displayable colors will appear (see the image below).  Of course this is only true if both the display processor and the panel support that number of bits!

More Bits = More Colors

• MOST IMPORTANT: SURGE PROTECTION
  If you have a computer, you know all about surge suppressors and battery back-up UPS devices.  But do you have a UPS for your HDTV and Home Theater system?  HDTVs and Home Theater systems are just as susceptible to surge and power damage as computers, so it is critical you add a very good surge suppressor or UPS to your setup at once! Plus if you have a UPS, you'll be able to watch TV or listen to music if the power goes off! (for as long as the battery lasts of course!)
  
   
• CONTROLLING IT ALL: ADVANCED REMOTE CONTROLS
  Almost every device you have came with a remote control, some even are called Universal Remote Controls.  But every device, HDTV, or Home Theater component has special features and functions, not supported by the generic Universal Remotes, especially if you want "One Button" control of several devices at once.  For these you need Advanced Remote Controls, that not only control everything, but reduce it all down to One Button tasks that even a Cave Man could operate! 
  
   
• GOT HELP? GET AN INSTALLATION & SETUP SERVICE
  With some of today's HDTV and Home Theater systems, you may want to consider getting expert help from certified technicians that can quickly install your HDTV on your wall, hide the cables and wires, balance the display settings and the 7.1 surround sound, for the maximum in sound and picture quality.  You can still tell your friends and family that you did it, it will just be our secret! 
  
   
• GET A GUARANTEED BUYBACK FOR YOUR HDTV
  Another way to protect your investment, given the changing pace of technology, is to add a Guaranteed Buyback to your HDTV purchase.  This will guaranty the trade-in value of your HDTV a year or two in the future, when you will be ready to upgrade to the latest technology. 

Viewing angles are not an issue with projectors because the light source is coming from in front of the screen, and not from behind. However, the surface on which you project (screen or wall surface) may have a slight impact on viewing angles, so it is important to choose the best screen possible.