Contrast Ratio & Brightness

Contrast ratio

Here, we undertake a simple contrast test that is both tough and realistic. The contrast ratio is the ratio of light coming from the screen when it is supposed to display bright white to light coming from the screen when it is supposed to display pure black. Overall, contrast ratios on LCD panels range from about a dismal 150:1 to a very good 800:1 or even greater.

For everyday tasks such as photo editing and Office, a contrast ratio of 400:1 or more is considered adequate. The problem is that even if you watch a movie on such a monitor in a dim location, you will realize that 'black is not truly black.' Laptop monitors are an excellent example (though much better these days), as they frequently have low contrast ratios (150:1 when viewed straight-on and below 80:1 at relatively small angles). A set of test photos with black and white luminance values are used to perform the measurement. And then OLED, black levels are unmeasurable( the pixel is deactivated) by any currently accessible tools; their contrast is mathematically infinite. The next best option is a VA monitor, but they pale in contrast to OLED.

The contrast ratio is a property of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system can produce. A high contrast ratio is a desired aspect of any display. The static contrast ratio is limited by the panel technology being used. A TN or IPS technology panel is limited by a contrast ratio of around 900 - 1200:1, and on a VA type panel, you might reach up to around 2000 to even 3000:1. We could not measure a whole black field in this OLED as planned because it is just too dark for our meter to register. 

Maximum brightness

To see how well a monitor behaves in heavily lit areas with a lot of sunlight, we look at maximum brightness in white. You can measure the output quite easily. Overall the screen shows a proper and decent brightness level close to the advertised brightness level range. 

A known limitation of any  OLED monitor is its lacklustre brightness performance. Compared to their LED and Mini-LED counterparts, OLED monitors often struggle to achieve and sustain high brightness levels throughout the display. Despite this drawback, the PG27AQDM boasts a respectable peak SDR brightness of 294 nits, which proves to be more than adequate in most use cases. In my experience, I frequently operated the monitor at less than 70% of its maximum brightness in my workspace.

I've put the value at 5000, but of course, pixels are on/off, which is an infinite value. 

In comparison, the PG27AQDM monitor excels in the area of contrast. Boasting the ability to produce perfect darkness, this display emits no light in dark scenes, significantly enhancing its ability to depict intricate details in these settings.  This monitor delivers a vivid viewing experience with high-quality content that sets it apart from the competition.