AVS Forum banner

Status
Not open for further replies.
1 - 4 of 4 Posts

·
Registered
Joined
·
339 Posts
Discussion Starter · #1 ·
I just bought a Hitachi 17" LCD. It's the new CML174 with the 16ms pixel response time.


I am coming from a Viewsonic 21" G810 which I bought about 5 years ago.


The new panel is super bright, high contrast, and really looks great to me.

I played Medal of Honor side by side from my CRT, and didn't see any

smearing on the LCD at all. It's very impressive, and I think, the first

LCD that will make game players happy enough to switch to LCD.


Hitachi's english isn't the best for the onscreen display and the manual,

but that's a minor issue.


I bought it from monitors direct. I have 30 days to return it for any reason.


I have a question for fellow LCD owners.


This monitor has one pixel on the left side that is green when the

screen is black, red when the screen is white, light red when the screen

is red, black when the screen is blue, and green when the screen is blue.


I contacted monitors direct and described this problem. I think it is a bad

pixel, and they thought it was a bad subpixel.


Hitachi has a policy of replacing the monitor for 1 or more bad pixels, but

only replacing it for >5 subpixels.


Does anyone have an opinion if this is a bad sub pixel or a bad pixel?

I guess a bad pixel just doesn't go on at all? That would be less annoying

to me.


I know this is being very particular, but aren't we all perfectionists?


Since it was $630, I'm not too stressed, but I would like to buy a

24" 1920X1200 LCD when the pixel refresh gets to 16ms. If I pay $2K

and get some bad pixels I will be seriously bummed, so I want to figure

this out before that happens.


Thanks for your insights!
 

·
Registered
Joined
·
71 Posts
Quote:
Originally posted by Axel Olmos
I just bought a Hitachi 17" LCD. It's the new CML174 with the 16ms pixel response time.

...

This monitor has one pixel on the left side that is green when the

screen is black, red when the screen is white, light red when the screen

is red, black when the screen is blue, and green when the screen is blue.


I contacted monitors direct and described this problem. I think it is a bad

pixel, and they thought it was a bad subpixel.


Hitachi has a policy of replacing the monitor for 1 or more bad pixels, but

only replacing it for >5 subpixels.


Does anyone have an opinion if this is a bad sub pixel or a bad pixel?

I guess a bad pixel just doesn't go on at all? That would be less annoying

to me.
Alex, I have a 17" Hitachi CM1711 computer monitor that I'm still very impressed by after using it nearly daily for six years.


TFT pixels can fail either on or off, and each subpixel can fail individually.


The symptoms you describe are not consistent and a little confusing. Perhaps you should magnify the spot and tell us what happens when you show each of the eight easy colors on the screen: Black, blue, red, green, yellow, magenta, cyan and white.


- Green on a black screen implies the green sub-pixel is stuck on.

- Red on a white screen either means magenta in which case green is stuck off or really red, in which case green and blue are stuck off.

- Magenta (light red) on red means the blue subpixel is stuck on.

- Black on blue means blue is stuck off.

- Green on blue disagrees with black on blue, but also means green is stuck on and blue is stuck off, but if you meant green on cyan, then just blue is stuck off.


Now I've started a spreadsheet showing how having one, two or three subpixels stuck on or off should look. What a mess.


Oof. It's getting too late to figure this out, but it seems like you have more than one subpixel in adjacent (or very nearby) pixels, and if you don't have five, you're out of luck. Be thankful that it's near its edge.


Chris
 

·
Registered
Joined
·
339 Posts
Discussion Starter · #3 ·
Thanks for the thoughtful reply. You made me approach the

problem as you did, and now I think I understand. Thanks

again for the help!!


Screen --- Color of bad pixel

black --- green

red --- magenta? light red? It's hard to see.

green --- black

blue --- green

white --- red


I think the green and blue subpixels might be messed up.


RGB --- RGB Bad Pixel

000 --- 010

100 --- 110

010 --- 000

001 --- 010

111 --- 100


Green is a logical NOT what green should be.

The Blue subpixel is just dead, I think.


I will just live with it. The monitor is just a hold me over until I can

get a 1920X1080 (1080P or greater) LCD at 16ms or less for $2 or $3K.


Axel
 

·
Registered
Joined
·
848 Posts
Axel,

Philips began manufacturing a 20" panel with 16ms response time this month, but I don't know how long it will be until manufacturers actually have a product incorporating it. I think that's the one I'm waiting for.
 
1 - 4 of 4 Posts
Status
Not open for further replies.
Top