What You Need to Know about 4K Projectors

Remember when high definition was the latest thing? I do. I first saw an HD TV at the Consumer Electronics Show a while back and I was astonished. Demo video was running on a loop of someone pouring champagne into a glass. The definition was definitely the sharpest I had ever seen. I could see every individual bubble rise to the top and churn as the bubbly bubbled. It felt like I was swimming through the sparkling beverage, and it felt like a toast to the future of video. It was.

Technology marches on. Black and white became colour and standard definition became high. 480p (A 480 pixels tall picture) became 720p (720 pixels tall) and evolved into 1080p (1080 pixels tall). Now there’s 4K. That’s 2160p. The champagne video I wondered over was presented in 1920 by 1080 pixels. 4K is four times as sharp a picture, glistening in 4096 by 2160 pixels.

OK, so what do all these pixels do for you, the viewer?

What makes 4K video resolution awesome is the ability to go big. Really big. Deeper resolution means TV or projector screens can be bigger and bigger without sacrificing sharpness, contrast, and colour. You see, the bigger a screen gets, the greater the potential for the picture to look fuzzy – if the resolution doesn’t scale up with it. The more pixels you can stuff into the space of a screen dimension, the sharper the picture will look. The tighter packed the pixels are with all the neighbouring pixels, the better.

Think of it this way: You print out some photos on your inkjet printer with brand new cartridges installed. The photos come out looking great, with rich details and vivid colour and contrast. Now, let’s say the ink cartridges are on their last legs. The colours look washed out and maybe some don’t even print at all, right? The new cartridges gave you more saturation. Video resolution has it limits in a similar way. Bigger screens need more pixels, and 4K is the sharpest available today. 

BenQ 4K projectors feature a skillfully constructed pure 4K-optimized optical system for the ultimate image precision and colour accuracy. With the Texas Instruments DLP Ultra High Definition (UHD) technology, BenQ 4K projectors deliver 8.3 million distinct pixels for true 4K UHD performance, complying with the 4K UHD standard set by the Consumer Technology Association (CTA).

Resolution, colour gamut and dynamic range have become the most important roles to determine the visual performance of 4K UHD displays. Colour gamut and dynamic range are two sides of the coin affecting the performance of the HDR effect. 

With HDR, a projector can display richer, more accurate (true-to-life) colours. There are a bazillion colours in the world out there, and the wider the colour gamut a device has, the more it can display. Some projectors attempt to display this broad colour spectrum by “colour mapping” or “tone mapping.” The device attempts to cover for its limitations by changing how it presents colours based on its capabilities.

That means a projector with wider colour gamut can show richer and more accurate colour after HDR colour mapping.

Details, details, details. It’s all about the details. High dynamic range devices can deliver greater contrast between really bright scenes and really dark ones. HDR expands the range from dark to bright and deepens colours, resulting in more realistic scenes for your viewing pleasure.

Dynamic range, or, the overall brightness range, is determined by a display’s or projector’s contrast ratio. That is the ratio of luminance (amount of light) between the darkest black and the brightest white that the device can reproduce. The higher the contrast ratio, the wider the dynamic range. That’s why it’s important for 4K displays to achieve high contrast ratio to perform smoother transitions between scenes and more details in bright and shadowy areas.

High dynamic range (HDR) expands the limits of the levels of bright and dark a TV or projector can display. HDR also makes colours more vibrant and richer in saturation (remember the ink jet cartridges?) What you’ll see are more realistic images. More true-to-life pictures. Not only can you see all the little bubbles in a champagne glass, you can read their name tags, too.