Dynamic Power Management for HDR Display Backlight Zones
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Solution Overview
Problem
High dynamic range (HDR) display devices face challenges in achieving high luminance ranges while maintaining low power consumption, which is necessary for ENERGY STAR certification and efficient operation.
Innovation Solution
Implementing dynamic power management techniques such as global dimming, local dimming, and highlight local dimming power profiles, which allow for varying light intensities across pixels and spatial regions, enabling HDR image rendering with power consumption comparable to standard dynamic range (SDR) displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a display device is engineered to support a wide luminance range (HDR) in each pixel, then the maximum luminance value can be increased to over 10,000 nits, but the electric power rating becomes excessively high, precluding ENERGY STAR certification
Solution Approach 1:
The display device is divided into multiple backlight zones that can be independently controlled. Each zone's brightness can be adjusted separately based on the content being displayed, allowing high luminance in specific areas while maintaining lower overall power consumption. This segmentation enables HDR performance without requiring the entire display to operate at maximum power rating.
Solution Approach 2:
The display device implements dynamic backlight control that adjusts luminance levels in real-time based on the displayed content. The system can switch between different power modes and adjust the number of active backlight zones dynamically, allowing the display to achieve high luminance values when needed while consuming minimal power during normal operation, thus meeting ENERGY STAR certification requirements.
2Illumination intensity
If all pixels are set to maximum light transmittance to achieve maximum luminance, then HDR image quality is improved, but power consumption increases significantly
Solution Approach 1:
Different regions of the display are assigned different luminance qualities based on the content requirements. The system identifies which spatial regions need high luminance for HDR content and directs backlight power only to those specific zones, while other regions operate at lower luminance levels. This local quality approach maintains HDR image quality in critical areas without unnecessarily consuming power across the entire display.
Solution Approach 2:
The system applies maximum luminance only to the extent necessary for rendering HDR content, rather than setting all pixels to maximum light transmittance. By using partial action (activating only the necessary backlight zones and pixels), the display achieves the required HDR performance while avoiding excessive power consumption that would occur if the entire display operated at maximum capacity.
Data Source
AI summary
An input media signal encoded with a portion of image data to be rendered with a target display device is received. It is determined, based on the portion of image data, whether a first power profile is to be applied to rendering the portion of image data with the target display device. In response to determining, based on the portion of image data, that the first power profile is not to be applied to rendering the portion of image data with the target display device, a second power profile is applied to rendering the portion of image data with the target display device.