Integrated Image Distortion Compensation Module for VR Displays
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Solution Overview
Problem
Current display devices face challenges in real-time image distortion compensation, particularly in virtual and augmented reality applications, due to the complexity of optical distortions such as pincushion, barrel, perspective, and chromatic aberrations, which require significant computational resources and increase power consumption.
Innovation Solution
A display device with an integrated image distortion compensation device that includes a look-up table, backward mapper, prefetcher, and interpolator, which handles pixel positions and values to generate compensated video signals, using tangential optical modeling and rational number approximations to minimize operations and memory access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time image distortion compensation is performed using powerful CPU, GPU, or GPGPU, then image quality is improved, but cost and power consumption are increased
Solution Approach 1:
The patent extracts the image distortion compensation function from general-purpose processors (CPU, GPU, GPGPU) and implements it as a dedicated hardware module within the display device. This specialization allows the compensation function to be performed with reduced power consumption while maintaining real-time processing capability and image quality.
Solution Approach 2:
The patent replaces software-based distortion compensation methods with hardware-based implementation. By using dedicated hardware circuits instead of software algorithms running on general-purpose processors, the system achieves real-time compensation with lower power consumption and without requiring powerful external processing units.
2Adaptability or versatility
If software-based distortion compensation is implemented, then flexibility is improved, but processing speed is reduced making real-time compensation difficult
Solution Approach 1:
The patent replaces software-based distortion compensation with hardware-based implementation. The dedicated hardware module performs coordinate transformation and image rendering operations in hardware, achieving real-time processing speeds that software cannot match while maintaining the flexibility to handle various distortion types through configurable parameters.
3Measurement precision
If complex optical distortions are compensated using external processing devices, then image quality is improved, but device complexity is increased
Solution Approach 1:
The patent merges the image distortion compensation function with the display device itself by integrating a dedicated compensation module into the display's internal architecture. This consolidation eliminates the need for separate external processing devices, reducing system complexity while maintaining the capability to compensate for complex optical distortions including pincushion, barrel, perspective, and chromatic aberrations.
Solution Approach 2:
The dedicated image distortion compensation module is designed to handle multiple types of optical distortions (pincushion, barrel, perspective, chromatic aberrations) within a single integrated unit. This multi-functional approach replaces the need for multiple specialized external processing devices, simplifying the overall system architecture.
Data Source
AI summary
A display device capable of image distortion compensation may be provided that includes a display panel which outputs a compensated video signal. The display panel includes: an input interface controller which receives a video signal; a memory which stores the video signal received by the input interface controller; a memory controller which controls an input and an output of the memory; and an image distortion compensation device which handles a pixel position and a pixel value of the video signal stored in the memory and generates the compensated video signal.