- VR headsets require displays that are close to the eyes, so in order to maintain the perceived quality of these images, which requires more pixels in the same area. In addition, higher frame rates up to 120 frames per second (fps) are needed to reduce the overall latency and achieve lower persistence on LCD VR panels. The unprecedented upside to pixel throughput is an order of magnitude higher than for non-VR applications, resulting in a significant increase in design complexity and system bandwidth. This represents a major challenge to the power and area budgets for mobile devices.
- HDR (High Dynamic Range) is an essential step in improved picture fidelity, providing a more realistic feel to images with better color and brightness capabilities, and a more realistic user experience. The demands of viewing HDR content on both HDR and SDR displays create a major challenge for the display sub-system due to the different capabilities of panels at the end of the display pipeline.
- Multi-window mode, previously the preserve of desktop, allows multiple activities to be seen on the screen, all at the same time. The windows are re-sizable and reconfigurable depending on limitations defined by both the app and system controls. In terms of system design, enabling multi-window functionality is not trivial. The enhanced Android Window Composition capabilities of a premium display solution allow users to multi-task on their mobile device with the same efficiency we see on desktop.
- The variety of panels and interfaces that need to be supported by display technology continues to grow, particularly as more complex content emerging and optimized functionality between the application processor and the panel’s display driver interconnect. From HDR to SDR, if media is able to display the vibrant color and crisp images we expect, the display pipeline must output the content to the correct performance capabilities of the panel, and also do so intelligently to avoid wasted bandwidth.
- 30% system power savings; Mali-D71 reduces GPU workloads by performing composition, rotation, high-quality scaling, and other imaging processing in fixed function hardware. This happens at the final stage of the pipeline, before sending the final output to the screen, meaning the GPU doesn’t have to be involved at all.
- 2x area efficiency; Mali-D71 achieves improved performance in the same area, compared to our previous generation Mali-DP650. When driving a single display, it can re-use the resources of a secondary display, resulting in more full frame layers being processed – doubling the performance
- 4x latency tolerance; Mali-D71 can sustain up to 4x the delay on the system bus for the same throughput, compared to previous generation Mali-DP650, thanks to significant optimizations in the memory subsystem. This is significant for high performance display processing where 4K frames must be fed to the output at up to 120 fps. The display processor needs to optimize the time it has on the system bus by prefetching pixels in the microseconds when the display is blank so that its buffers are always full of content.
- 2x pixel throughput; While operating in a new side-by-side mode, the Mali-D71 can achieve unprecedented 2x pixel throughput, delivering premium VR 4K120 performance, all within a very low power envelope.
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