Re: Quality screen for colorimetry

On Mar 16, 6:12 am, Roger Breton <g...@xxxxxxxxxxxx> wrote:
What is it that constitutes an LCD "module"? Is that defined formerly
anywhere? In terms of construction, electronics?

Wouldn't mind reading up on it.

It's a de-facto definition. As I stated earlier, an LCD manufacturing
plant is a horrifically expensive investment. Monitor manufacturers
do not make the LCD portion of an LCD monitor. Of course, you can
exclude from this companies who are LCD module manufacturers that also
have a monitor operation (Samsung, LG, etc.).

Monitor: The integration of an LCD module with application-specific
signal processing electronics.

Examples of monitors might be: Computer monitor, Television set,
Built-in monitor in an MRI machine, Built-in monitor in a teller
machine, touchscreen monitor in a specialized instrument, passanger
video monitor in an aircraft.

In each of these cases the processor might require different inputs
and different kinds of signal processing.

They all use LCD modules as a component. A component is something you
buy, ready-made, bolt into your product and use.

LCD Module: The self contained combination of a liquid crystal optical
modulator with driving electronics and an industry-standard interface
for connection to an image processor.

An LCD module consists of:
1- Backlight (fluorescent tubes or LEDs)
2- Optics
3- Liquid crystal light modulator (LCM)
4- Specialized D/A converters bonded to the LCM
5- LVDS interface board

Probably 99.9% of all color LCD modules made for monitor/laptop/tv
applications come with an LVDS interface. This is a differential
interface that provides for 6 to 8 bits per channel of connectivity
with an image processor.

When a monitor manufacturer buys an LCD module they choose from the
available population of standard modules. They simply plug them into
their custom (or not) image processor, package and ship. This means
that the theoretical best performance of all LCD monitors using the
same LCD module is exactly the same. I said "best performance". The
image processor board can certainly screw things up and deliver less
than optimal performance. There are a few tricks one can use to
improve the performance slightly (slightly!), but not many.

I hope this answers your question.

-Martin


.

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