Foveated Display Light Modulation With Gaze-Driven Pixel Dithering
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Solution Overview
Problem
Display technologies face challenges in balancing pixel size, light efficiency, and cost, particularly in small form-factor displays, leading to increased power consumption and limited deployment contexts, with existing designs struggling to achieve high resolution without compromising on these factors.
Innovation Solution
A head-mounted display system with an eye-tracking mechanism and pixel dithering optical components, such as zonal switchable waveplates and Pancharatnam-Berry Phase gratings, modulates display light between sub-frames to enhance perceived resolution by shifting optical paths for focused gaze areas, effectively doubling the resolution through time-multiplexed subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel size is reduced to increase display resolution, then perceived resolution improves, but light efficiency decreases and power consumption increases
Solution Approach 1:
The patent applies dynamics by making the optical component (waveplate or grating) switchable between different states. The optical component dynamically changes its configuration based on which subframe is being displayed, enabling the system to alternate between showing even and odd pixel rows. This dynamic switching allows the display to achieve higher perceived resolution without requiring all pixels to be continuously active at full resolution, thereby reducing power consumption.
Solution Approach 2:
The patent implements periodic action through time-multiplexed subframes. The display alternates between first subframes showing even pixel rows and second subframes showing odd pixel rows at different time intervals. This periodic switching, combined with the persistent vision effect of the human eye, creates the perception of full resolution while actually displaying at half resolution at any given moment, thus reducing power consumption.
2Manufacturing precision
If pixel size is reduced to increase display resolution, then perceived resolution improves, but light efficiency decreases
Solution Approach 1:
The switchable optical component dynamically alters the optical path based on the current subframe being displayed. During even subframes, the optical component directs light for even pixel rows to the viewer's eye; during odd subframes, it directs light for odd pixel rows. This dynamic optical switching ensures that light is efficiently directed only when needed, improving light efficiency while maintaining high perceived resolution.
Solution Approach 2:
The patent introduces an intermediary optical component (switchable waveplate or grating) between the display and the viewer's eye. This intermediary manipulates the light paths from different pixel rows at different times, enabling the system to present high-resolution images without requiring all pixels to emit light simultaneously. The intermediary optical element acts as a mediator that controls light distribution, thereby improving light efficiency.
3Manufacturing precision
If pixel pitch is reduced for smaller form factor displays, then display resolution improves, but manufacturing capability is limited
Solution Approach 1:
The patent transitions from a spatial resolution approach to a temporal resolution approach. Instead of increasing pixel density in the spatial domain (which would require smaller pixel pitches and advanced glass etching), the system uses time-multiplexed subframes to achieve higher perceived resolution. This dimensional shift from space to time allows the display to achieve high resolution without pushing the limits of current glass etching capabilities.
Solution Approach 2:
The patent changes the operating parameters of the display system by introducing temporal multiplexing. Instead of maintaining static high pixel density, the system dynamically changes which pixels are active at different time intervals. This parameter change from spatial density to temporal activation allows the display to achieve high effective resolution while using larger, more manufacturable pixel pitches that are within current glass etching capabilities.
4Manufacturing precision
If optical paths are shifted to double resolution through subframe modulation, then perceived resolution improves, but device complexity increases
Solution Approach 1:
The switchable optical component serves multiple functions: it acts as a waveplate in one state and as a grating in another state, enabling it to manipulate light paths for different subframes. This multi-functionality reduces the need for separate optical components for each function, thereby managing device complexity while achieving the resolution-doubling effect through subframe modulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system increases perceived resolution in focused gaze areas by leveraging eye-tracking to dynamically adjust optical paths, providing improved image clarity without increasing power consumption or physical pixel density, thus optimizing display performance in small form-factor devices.
Implementation Method 1
A pixel dithering optical component may include a zonal switchable waveplate and a Pancharatnam-Berry Phase (PBP) grating. The PBP grating may be configured to diffract the first polarization orientation at a first diffraction angle and the second polarization orientation at a second diffraction angle.
Implementation Method 2
the display light is modulated between a first polarization orientation in a first subframe and a second polarization orientation in a second subframe
Implementation Method 3
The zonal switchable waveplate may output the first polarization orientation in a first state and the second polarization orientation in a second state. The first polarization orientation may be opposite-handed circular polarization orientations.
Data Source
AI summary
Gaze data of a user is received. A display zone corresponding to the gaze data is identified. The display zone is a portion of a display pixel array. The display light generated by the display zone is modulated to shift an optical path of the display light within the display zone.