Question:
I have noticed a problem with my TV and was not sure which of these two terms it comes under, convergence or geometry.
I have noticed in 4:3 mode were the black bars meet the picture aren't quite straight. If you look at picture they look hidiously bent. In 16x9 mode I have noticed that the picture is not completely straight, there seems to be a slight dip in the middle at the top and bottom.
I know these problems can be sorted via the service menu but just wanted to know which problem I have so I can search the internet for a solution.
Geometry.
Horizontal bowing (ie black bar looks like it's frowning or smiling) is generally impossible to sort in the service menu. Needs the gun re-aligning by an engineer..
The geometry is slightly out on my WSTV, but after a while you just tend to forget about it..
I have to say I didn't notice until last friday when for some bizare reason I decided to get real close up to the TV and noticed the smile / frown. Now it sticks out like a sore thumb.
Yep, annoying isn't it?
Geometry is anything about the overall shape of the picture. bowing, tilting, kinks etc.
Convergence is about the alignment of the three colours (red, green, blue) that the picture is made up of.
At the risk of spoiling your enjoyment even more (!) if you bring up, say, a teletext page with mainly white characters, and look closely, most probably in the corners of the screen, you are likely to see some coloured fringing around the edges - for example, a red 'shadow'. You may see this happening on logos as well, or on subtitles. This is because the three coloured images are not all the same size and shape, ie, are not in the same pkace on the screen. This is a convergence error.
The only TVs that are likely to be completely free from geometry and convergence errors are flat panels - LCD and Plasma at present. But they have their own shortcomings - less contrast (seen as an issue by many, but not by me) etc., and, of course, price.
I have noticed in 4:3 mode were the black bars meet the picture aren't quite straight. If you look at picture they look hidiously bent. In 16x9 mode I have noticed that the picture is not completely straight, there seems to be a slight dip in the middle at the top and bottom.
I know these problems can be sorted via the service menu but just wanted to know which problem I have so I can search the internet for a solution.
Answers:
Geometry.
Horizontal bowing (ie black bar looks like it's frowning or smiling) is generally impossible to sort in the service menu. Needs the gun re-aligning by an engineer..
The geometry is slightly out on my WSTV, but after a while you just tend to forget about it..
Answers:
I have to say I didn't notice until last friday when for some bizare reason I decided to get real close up to the TV and noticed the smile / frown. Now it sticks out like a sore thumb.
Answers:
Yep, annoying isn't it?
Geometry is anything about the overall shape of the picture. bowing, tilting, kinks etc.
Convergence is about the alignment of the three colours (red, green, blue) that the picture is made up of.
At the risk of spoiling your enjoyment even more (!) if you bring up, say, a teletext page with mainly white characters, and look closely, most probably in the corners of the screen, you are likely to see some coloured fringing around the edges - for example, a red 'shadow'. You may see this happening on logos as well, or on subtitles. This is because the three coloured images are not all the same size and shape, ie, are not in the same pkace on the screen. This is a convergence error.
The only TVs that are likely to be completely free from geometry and convergence errors are flat panels - LCD and Plasma at present. But they have their own shortcomings - less contrast (seen as an issue by many, but not by me) etc., and, of course, price.
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