DLP HDTV (continued)
To Wobble or Not to Wobble
That is the question … Wobulation is the humorously coined term when a single mirror is used for two pixels. The mirror spends 1/120th of a second on one pixel and then wobbles over to the adjacent pixel, and spends 1/120th of a second there. Therefore, using the same mirror to produce 2 pixels in 1/60th of a second. Once again, this rapid motion is too fast for our eyes to see. The advantage of wobulation is a reduction in manufacturing costs since only half the mirrors are needed. Some also say that the picture is smoother and flows better. The disadvantage of wobulation is lower sharpness and clarity levels.
Know your DLP chipsets. There are noticeable picture quality differences between each chipset. There are also noticeable cost differences. As time goes on, Texas Instruments improves the quality of each chipset. Below is a list of DLP chipsets with HD2 being the oldest and xHD4 being the newest.
- HD2 – 1280 x 720 mirrors, no wobulation is used to produce a resolution of 720p with a 1500:1 contrast ratio.
- HD3 – 640 x 720 mirrors, wobulation is used to produce a resolution of 720p with a 2000:1 contrast ratio.
- HD2+ - 1280 x 720 mirrors, no wobulation is used to produce a resolution of 720p with a 2500:1 contrast ratio.
- HD4 - 640 x 720 mirrors, wobulation is used to produce a resolution of 720p with a 2500:1 contrast ratio.
- xHD4 - 960 x 1080 mirrors, wobulation is used to produce a resolution of 1080p with a 10,000:1 contrast ratio.
- Great contrast ratio
- Great blacks – important for shadow depth
- Great colors
- Great picture quality
- No burn-in. Important if you watch a lot of 4:3 images or use a HTPC
- High horizontal viewing angles
- High brightness levels – viewable in bright room
- No motion blur – important for sport fanatics
- Rainbows - quick flashes of colored light on the edge of sharp transitions from black to white. Could be very aggravating, but only a small amount of people see them.
- Low vertical viewing angles.
- Changing a bulb required approximately every 4000 hours.
- Typically around 15 inches in depth, so not wall mountable.