HMD Display Frequency Segmentation for Flicker-Free Power Savings
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Solution Overview
Problem
Head-mounted display (HMD) devices face challenges in providing improved image quality while reducing power consumption, as they operate close to the user's eyes and require efficient image rendering techniques.
Innovation Solution
A display device with a driving frequency calculator that divides output image data into central, intermediate, and peripheral regions, calculates spatial and critical flicker frequencies based on viewing angles, and determines driving frequencies to enhance image quality and reduce power consumption by optimizing display frequencies for each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform high driving frequency is applied to the entire display panel to prevent flicker in the central visual field, then image quality is improved, but power consumption increases
Solution Approach 1:
The display panel is divided into multiple visual field regions (central, intermediate, peripheral) with different driving frequencies. The central visual field region uses a higher driving frequency to prevent flicker and ensure image quality, while peripheral regions use lower driving frequencies to reduce power consumption. This spatial segmentation allows differentiated frequency control based on human visual sensitivity.
Solution Approach 2:
Different driving frequencies are applied to different regions of the display panel according to local visual sensitivity requirements. The central region, where human eyes are most sensitive to flicker, receives higher frequency signals, while peripheral regions receive lower frequency signals. This local quality approach optimizes both image quality and power consumption by matching display characteristics to human visual perception.
2Loss of energy
If a lower driving frequency is used to reduce power consumption, then energy efficiency is improved, but flicker becomes visible in the central visual field region
Solution Approach 1:
The display system dynamically adjusts driving frequencies based on spatial location within the visual field. Rather than using a static uniform frequency, the system varies the driving frequency according to the visual sensitivity requirements of different regions, ensuring flicker-free display in the central field while conserving energy in peripheral regions.
Solution Approach 2:
The driving frequency parameter is changed spatially across different visual field regions. By modifying this critical parameter based on location, the system prevents flicker in the central region where it is most noticeable while allowing lower frequencies in peripheral regions to reduce power consumption.
3Use of energy by stationary object
If foveated rendering is applied to reduce processing load, then power consumption is reduced, but image quality may deteriorate in peripheral regions
Solution Approach 1:
The display system uses periodic refresh cycles with different frequencies for different visual field regions. The central region is refreshed at higher frequencies to maintain image quality, while peripheral regions use lower refresh frequencies that are still sufficient for acceptable display quality, thus reducing overall processing load and power consumption.
Data Source
AI summary
A display device includes a driving frequency calculator configured to divide output image data into central, intermediate, and peripheral images respectively corresponding to central, intermediate, and peripheral visual field regions, calculate spatial frequencies of the central image, the intermediate image, and the peripheral image, calculate critical flicker frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the spatial frequencies and based on viewing angles of the central visual field region, the intermediate visual field region, and the peripheral visual field region, and determine driving frequencies of the central visual field region, the intermediate visual field region, and the peripheral visual field region based on the critical flicker frequencies, and a display panel configured to display an image based on the output image data and based on the driving frequencies.