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BenQ Knowledge Center / BenQ Knowledge Center / Dynamic Iris Technology and How It Enhances Dynamic Contrast

How to Intensify Your 4K HDR Viewing Experience?

Dynamic Iris Technology and How It Enhances Dynamic Contrast

BenQ
2019/10/14

When you think of cinematic visuals, color is often the first thing that comes to mind. But aside from color, the application of light and its effect on the image is equally important to the visual narrative. The contrast between light and dark can be used to enhance the realism of the overall image as well as intensify the feelings of awe and wonder. In addition to focusing the audience’s attention, the interplay between light and dark can take a two-dimensional image and give it a three-dimensional feel, giving the scene increased depth and infusing rendered surfaces with greater texture, all working together to strengthen the emotional power of cinema.

The contrast between light and dark can be used to enhance the realism of the overall image as well as intensify the feelings of awe and wonder.

For projectors with HDR, the question is how to boost dynamic contrast to make the blacks become deeper and more detailed and the whites fuller and more authentic? One of the answers is to use a dynamic iris.

  • What is Dynamic Iris?
  • Why Use Dynamic Iris?
  • How a Dynamic Iris Works
  • Dual Dynamic Iris Solution

    • What is Dynamic Iris?

    Dynamic iris is a mechanism in projectors integrated between the projector lamp and lens that opens or closes depending on the overall brightness of the projected image to adjust the projected light. For bright images the iris opens wider to allow more light, while for dark images the iris closes to reduce the amount of light projected.

    Why Use Dynamic Iris?

    A dynamic iris is used to fine-tune the projected image by enabling the projector to enhance its on/off contrast: in other words, the difference between the brightest white when the iris is fully open and the darkest black when the iris is closed. This ensures that dark scenes are appropriately dark, while bright scenes are as bright as they can be.

    A dynamic iris is used to fine-tune the dark-scene image by enabling the projector to enhance the brightness black when the iris is off.

    Without Dynamic Iris

    A dynamic iris is used to fine-tune the dark-scene image by enabling the projector to enhance the brightness black when the iris is on.

    With Dynamic Iris

    A dynamic iris is used to fine-tune the bright-scene image by enabling the projector to enhance the brightness white when the iris is closed.

    Without Dynamic Iris

    Dynamic iris is used to fine-tune the bright-scene image by enabling the projector to enhance the brightness white when the iris is on.

    With Dynamic Iris

    How a Dynamic Iris Works

    The engineering behind dynamic irises varies across a wide range of designs to achieve the contrast-boosting effect, from different brands and even among models from the same brand. For example, some projectors use an apparatus similar to a leaf shutter on a camera, with blades moving to increase or decrease the size of the iris based on the needs of the image. Other projectors employ a wheel-like instrument with a gradually shrinking aperture, which rotates to change the size of the opening to achieve the contrast-boosting effect.

    Regardless of the type of design, the fundamental principle is the same: dynamic irises increase or decrease the amount of projected light through the lens from the overall produced light from the lamp.

    Dynamic irises vary across a wide range of designs.

    Dynamic irises vary across a wide range of designs

    Dual Dynamic Iris Solution

    To further refine dynamic iris technology, BenQ developed the Dual Dynamic Iris solution, employing two separate irises that work in tandem to further fine-tune the amount of projected light for maximum on/off contrast. Dual Dynamic Iris projectors add a step-aperture iris to the original dynamic iris, close to the lens, which resizes itself depending on the brightness of the image to give additional control over projected light and ensure that only the ideal amount of light is projected for a given image.

    Complementing these mechanics is Texas Instruments’ DynamicBlackTM, which allows the projector to evaluate the source image’s brightness level with greater sensitivity and determine more precisely how and when to deploy the projector’s irises in order to optimize light output and contrast.

    The picture shows the light mode and right mode of dual dynamic iris solution.

    Dual Dynamic Iris Solution
    (left: Light Mode/ right: Dark Mode)

    Learn More

    Can Projectors Really Be HDR?

    A common doubt among the consumers when facing more and more home theater projectors in the market is if they really can be qualified as HDR devices. Therefore, this article will start from the projectors. Taking the nature of the technology behind projectors and its limitation into account, and find the definition of HDR for projectors.

    What is BenQ HDR-PRO Technology?

    In this article, we will introduce three keys of BenQ HDR-PRO technology: Tone Mapping, Dynamic Iris with DynamicBlack™ Technology, and HDR brightness, including how they are used to display the details in highlights and shadows.

    The Key of HDR Color Grading in Post-Production

    Is color grading in the post-production going to affect the display and projection of the HDR images? We will start from color grading in post-production, analyze what we need to take care of when doing color grading for HDR, the difference between that and conventional color grading, the basic workflow of color grading, and display devices required for the work. All these steps and aspects of understanding will affect how images are shown on the displays.

    What is BenQ CinematicColor Technology?

    BenQ home cinema projectors embody our belief to “Convey the truest color and impart the deepest feelings to the viewer.” Our THX and ISF dual-certified engineers deliver 100% Rec. 709 color gamut for perfect color consistency.

    How to Choose the Perfect Home Theater Projector

    Ultimate Giant Screen Cinema Enjoyment in Compact Spaces A home theater projector is the ideal entertainment choice for movie lovers. And it’s easy to choose the perfect projector for watching movies, playing games, and family fun. It only takes three steps to find the right projector for amazing viewing experiences and quality family time.

    Brightness matters! Understand the relationships between brightness, projection distance, lighting, image quality and color

    What you need to know about throw distance and ambient lighting? Typically expressed in lumens or ANSI lumens, brightness specification is an important reference when selecting a projector. However, the practical meaning of projector brightness and how to choose a projector for your specific installation needs can be confusing. The following information will help you understand the relationship between brightness and projection effect, as well as application.

    The Importance of Color Accuracy

    In our time, movies have become a necessary staple of life. Given this, how to get the most precise and accurate colors out of our audio-video equipment has become a question of growing importance. With all this in mind, what exactly is color accuracy? Is color accuracy just a wide color gamut? And finally, how to we achieve color accuracy?

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