LCD -matrices,differences and what models are placed *Part 2*

jamred21

I will provide a couple of photos.

I picked up an Insignia NS-42E440A13 and have been using my loupe and iPhone to identify the panel.  I've taken a couple of pictures of the panel.  The first picture looks like the panel is an AU MVA.  The second picture i took is making me believe that this panel is a PSA.  

According to Screen Technology and Sub-Pixels Up Close PSA is classified as thin lines between the subpixels.  Looking at my second picture, it appears that the red pixel and subpixels have thin line  seperating them.  PSA also has lower viewing angles, compared to MVA.  This Insigia set is listed as 160 degree viewing angle, and may actually be worse, from my own observation.  The color and depth are superb.  Considering all these factors, I thought that this panel may be an early PSA PVA from either AU or Samsung.  I picked this set up for 250$, so i'm pretty happy with it.

adtomov

Hi  jamred21,
it looks like AUO AMVA. Both AUO and SAMSUNG use PSA as a method of achieving proper liquid crystal pre-tilt angles without rubbing, protrusions, or patterned common electrodes, as it is described in:
LCD manufacturing technologies target increasing transmission to reduce panel costs - ElectroIQ
Sharp's UV2A is another method of achieving the same. Also mentioned in the above reference link.
So, as You see, PSA may be used as a method in MVA and PVA  "VA" technologies in order to achieve better LC response to voltage applied and better contrast.
Sharp uses the UV2A technology in order to obtain the same features. Their matrix also uses VA technology  - "ASV" (Advanced super view), or more revealing "AS-VA" (Advanced symmetrical vertical alignment ).
As You see, pre-tilt alignment of liquid crystals methods (UV2A or PSA) can be applied only in "VA" LCDs - A-MVA, S-PVA AS-VA etc..

jamred21

Yeah, it probably is an A-MVA PSA.  Do you know of other TVs that use this panel?  They didn't make many of these Insignias so it seems likely to me that these panels were limited supply or left over.

Here's a couple of pics of a Samsung UN-32D4005, bought from Costco.  These pixels are horizontally aligned, so it's definitively not a s-pva or any va panel.  It only has 4 sub pixels for each color of the pixel.

adtomov

In practice, I believe that nowadays all the panels supplied from AUO use PSA method. Samsung still produce non-PSA matrices for low-grade, low cost TV sets, under 40".

It looks like an AUO panel  - VA technology with PSA. Each subpixel has 4 domains. 3 subpixels per pixel. I've first spotted such AUO panel in late 2009. A Panasonic TV set was fitted with one of these. Used in low -diagonal, low- and mid-grade TV sets.
Similar picture: http://forum.ixbt.com/topic.cgi?id=62:11088-34#1207
There is a chance that it is a low-grade PSA PVA panel from Samsung, I've not taken picture of, yet.

Here are some gathered pictures in the first thread. Hope they will be useful to You and would answer some of Your questions..
http://www.avforums.com/forums/lcd-led-lcd-tvs/1113353-lcd-matrices-differences-what-models-placed.html

jamred21

How is it a VA when the pixels are not vertical, they're horizontal.  Is it a VA with a 90 degree rotation?

Do you want me to post pictures of panels?  I though that is what people wanted here.  I am more than willing to do so, if it is desired.

adtomov

The pixels orientation is out of interest. "Vertical alignment" means that liquid crystal molecules within the pixels are verticaly oriented TOWARDS YOU and are rotating within a plane crossing your eyes, depending on the voltage applied by the electrodes, in order to conduct or not to conduct polarized backlight to the observer.
http://www.personal.kent.edu/~mgu/LCD/lc_basics.htm
The World of Liquid Crystal Displays
There is another basic method of rotating the molecules - "in-plane switching", IPS. The molecules are rotating in a plane parallel to the LCD panel surface.
The World of Liquid Crystal Displays


You are most welcome..

jamred21

Edit: I mixed up the pictures, this was actually a Samsung TV not an Insignia.

Samsung UN40ES6100FXZA

jamred21

Lg 55lm6700

jamred21

Sony KDL55EX640

This is definitively a S-PVA w/ PSA.

If anybody has any requests just let me know and I will post them here.  What panels do you guys want to see?

hristoslav2

S-MVA

Lg 55lm6700 -  S-IPS