Now it's time to unravel its mystery, Arm Assertive Display 5, which brings the entire set of HDR management capabilities to the display pipeline.
Recognized as the market-leading outdoor visibility solution for long, Assertive Display has assembled more than 1 billion mobile devices to date and employs an innovative local tone mapping engine that continuously adjusts each pixel to Compensate for less than ideal conditions - such as monitor limitations, ambient light conditions, and weakened backlighting - for a high quality viewing experience indoors or in the sunny outdoors.
HDR, gives you a realistic viewing experience
Until now, display technology has been hard to reproduce what human eyes see: traditional standard dynamic range (SDR) content such as sRGB has a contrast ratio of around 2,000: 1, which means the shadows become darker on the screen, The illuminated areas, such as clouds, are often bleached.
However, the HDR content contrast ratio can reach about 100,000: 1, which can make the color look richer, the details are more vivid, the texture is more real and the realistic to the amazing viewing experience ... Of course, the premise is to accurately copy such Contrast.
Ideally, we were watching HDR content with a high-end HDR panel in a dark room, preserving the light and shadow detail and delivering excellent HDR quality, but most would expect a series of less-than-ideal viewing Watching movie under the conditions of the vast majority of the current consumer market, the screen can not display the full dynamic range of HDR content.
However, there is a solution ...
Display pipeline HDR management
Whether we watch on a mobile handset or an advanced HDR panel, it's taken for granted that our content will be reproduced more or less faithfully with the touch of a button.However, the pipeline to deliver these images to the screen is relatively long and complex.
First, the digital image is captured and then efficiently compressed and encoded for transmission to your device, followed by tone mapping, either to fit the HDR content to a lower specification display, or to 'upgrade' the content for display on an HDR device , While dynamically compensating for ambient lighting conditions Finally, the image is displayed on the target device.
Assertive Display 5's HDR management capabilities control every phase of the display pipeline for optimal performance and dramatic power savings:
• HDR-to-SDR mapping: Accurately map HDR content to monitor specifications to compensate for ambient lighting conditions • HDR-to-HDR mapping: Compensate HDR for vulnerability under ambient lighting conditions, otherwise the value and viewing experience of HDR content Will be compromised • Retains the HDR experience even with reduced backlighting, especially for HDR viewing on handhelds and laptops while dramatically improving power savings • Supports HDR10 and HLG standards: PQ, PQ10 and HLG10
The perfect picture: the legend of local tone mapping
Assertive Display 5 The iridix8 HDR, an advanced, high-precision local tone mapping engine, provides an excellent HDR experience even on SDR panels.
Tone mapping actually maps one set of colors to another, displaying high-dynamic-range images approximately on a device with limited dynamic range.
Global (also known as airspace invariant) tone mapping creates an average transfer curve and then uses it to map every pixel in the image in the same way, though it is fast and easy to accomplish, which can potentially lead to brightness, contrast and The loss of saturation and the shift of color and color.
Local (also known as airspace-varying) tone mapping uses more sophisticated algorithms to calculate individual transition curves for each pixel based on the image's own characteristics, preserving brightness, color and contrast, and presenting details in darker areas. Because human vision It is extremely sensitive to local contrast, it creates a more realistic image, rich in detail, the eyes will feel it to the maximum extent reflects the human visual experience.
HDR content is not ideal for viewing in the sun Ambient lighting and reflections can cause loss of contrast and detail on the display panel, but Assertive Display's tone mapping enables dynamic compensation to ensure users get the full range of high-quality, ambient light conditions HDR viewing experience.
Advanced color gamut and color management
HDR content typically has a wider color gamut than traditional content formats: SDR uses a Rec.709 color space, HDR uses a Rec.2020 wide color gamut or WCG.
HDR increases the dynamic range of the image, and WCG adds usable color palettes: the hue of each color increases and the color intensity increases, providing a richer, more immersive viewing experience.
While current HDR displays can not yet display the full color gamut of Rec.2020, they can show a P3 gamut between Rec. 709 and Rec. 2020 and performance has been constantly improving, but as we mentioned earlier , The color gamut of the content must map exactly to the color gamut of the display for the most realistic color experience, regardless of the display panel's characteristics.
3D LUTs provide an efficient solution to map color channels individually to preserve a wider gamut of textures, but this often adds costly hardware costs, but the hardware implementation for 3D LUTs , Assertive Display 5 uses a new, compact and inexpensive hardware implementation, advanced color gamut and color mapping, to retain the delicate color level, showing a real viewing experience.
Market-leading outdoor visibility and power-saving performance
We've seen how the tone mapping of Assertive Display dynamically compensates for ambient light and reflections to provide a high-quality HDR viewing experience regardless of the ambient light conditions, but it's truly amazing at the same time that it dramatically improves power savings efficacy.
Traditional content-adaptive power-saving methods clear out bright areas and easily visualize time-domain artifacts, but Assertive Display's adaptive backlit control solution with iridix local tone mapping engine enables seamless dynamic backlighting, And does not produce cutting artifacts, in the weak backlight is also true.
Multi-window mode
We are very much accustomed to the laptop's split-screen display, multi-window overlay, including free mode, zoom mode and picture-in-picture mode, is rapidly becoming a 'must have' for a range of devices and has the ability to overlay four or more windows High-quality display solutions.
Assertive Display 5 with Mali D71 supports HDR and SDR windows in the same overlay scene, allowing multiple windows to be scaled simultaneously.
Assertive Display 5 chip size is particularly small, using a simple RGB interface for easy integration and use, and HDR management can achieve, outdoor visibility and power-saving advanced features.
