Voltage difference between WXGA, WSXGA, and WUXGA?

Just wondering, there is a voltage difference between these three resolutions, right? That's what I've read on numerous sites anyway...

And it would burn out an inverter board and cable if a high resolution display was used on a board and cable for a lower resolution, correct?

 

In short there may be a voltage difference between the three different resolution panels, however the difference is NOT because of the resolution. It is because of manufacturer's intent with the LCD, a large LCD will require larger CCFL lamps, and IPS/VA/PVA panel will require stronger backlighting since it's luminance is lower then TN panels. Sometimes the manufacturer just wants a bright LCD so they stick 2 CCFL on laptop screens.

In truth the CCFL assembly (including inverter) is independent from the resolution of the screen. Keep in mind CCFL lamps/inverters may be different even in same sized LCD's from the same manufacturer as the backlight assembly is the responsibility of the person buying the panels or can be ordered to spec, so you could run into issues there but thats independent of LCD's resolution.

EDIT:
To answer your second question. Theres no such thing as a high resolution inverter or cable. There's just inverters running on different voltages/cables designed for different voltage/amperage. There are no rules saying a 1920x1200@ 15.4" must have a stronger backlight then a 1440x900@ 15.4"... It's up to the manufacturer or whoever is ordering the LCD's, like Dell, Toshiba, etc.

 

Thanks for the answer. I don't have a huge amount of knowledge on CCFL displays and inverter boards, etc.

So, a 15.4" WXGA display could potentially be swapped out for a 15.4" WUXGA display, but only if it used the same backlight, correct?

 

no they usually have different connecters.

Those two resolutions.

 

Well, from what I have seen around, it seems that quite a lot of displays, both 1920 x 1200 and 1280 x 800 use a standardized 30 pin connector.

Sorry if it sounds like I'm being stubborn. I just really want to find out some information.

 

Only one way to check, open it.

 

This is not at all true.

WXGA CCFL screens almost always use 30 pin connectors.
Sometimes only 15 wires will fill this connector, it will not be capable of WXGA+ and beyond.

However it is still the same connector. I have gone from WXGA to WSXGA many times and WUXGA is no different.

The backlights are usually pretty standard. Good thing about screwing up backlights is they are pretty easily replaceable without ruining the screen.

I have been thinking about adding a second backlight to a screen (from a dual CCFL assembly) where it would be put to better use than an ultrabrite WXGA screen.

 

On the opposite side of the first CCFL. Typically the top/bottom are the best places since those are the two sides that are most impact by viewing angles thus don't matter as much if they're overly bright.

 

Would it be dependent on manufacturer of the LCD not the resolution?

Anyways many Acer Gateway EMachines models come with a wide variety of LCD panel's so if you go onto their ASP login usually there are at least 5 choices of LCD panel's. However not all will be compatible with the inverter you have.

I was also contemplating upgrading my Vostro to at least 1680x1050 from 1280x800, but I might need a new inverter.

 

First of all, there is no such thing as "standard on LCD panel connector". They just mostly use JAE-produced parts, but these are not always the same just based on resolution. JAE has quite small lineup, dependant on number of pins, that's why they are often same in diff panel models.

Number of required pins depends on:
- if its simple LVDS or dual-LVDS (depends on resolution)
- if LED backlight power lines are included (mostly for lower power WLED screeens, higher power, RGB LED and CCFL use separate backlight connector)
The exact connector pinout then entirely up to panel designer. Since most manufacturers reuse designs once made, they don't change drastically often between models (but they still do sometimes).

From engineering standpoint, in most cases electrical interfaces are always the same (LVDS, I2C). This means that almost any modern panel could be attached to modern laptop - provided that you have a proper cable. And cable is where it ends in most cases - if you don't replace cable, your only hope is finding the different panel which uses same connector and same pinout on the connector.

The stories of panels going bust out there are not because some "voltage" was wrong. In most cases it's because people try to connect panel with same connector but different pinout - which could fry some circuits pronto, equally on panel or on laptop.