Full-Color Display Calibration for RGB Waveguide Misalignment
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Solution Overview
Problem
Existing full color display systems face misalignment issues due to process and equipment limitations, particularly in augmented reality glasses, leading to image quality degradation and color mixing problems.
Innovation Solution
A display system comprising separate RGB display dies integrated onto an optical waveguide system with a lens system, utilizing grating portions for beam coupling and diffraction, and a calibration method that optically measures and corrects misalignments through software adjustments without altering the driver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate RGB display dies are integrated onto an optical waveguide system, then full color high-resolution display is achieved, but misalignment occurs due to process and equipment limitations
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values in a lookup table before actual display operation. The misalignment between RGB display dies is measured during assembly, and correction data is pre-computed and stored, allowing rapid real-time correction without complex runtime calculations or mechanical adjustments.
Solution Approach 2:
The patent changes the parameter space by introducing software-based pixel-level correction parameters to compensate for physical misalignment. Instead of mechanically adjusting the display dies, the system modifies the digital signal parameters (pixel positions, colors) to correct the misalignment, transforming a physical alignment problem into a digital signal processing problem.
2Manufacturing precision
If mechanical alignment methods are used to position RGB display dies, then alignment precision can be improved, but device size and complexity increase
Solution Approach 1:
The patent replaces mechanical alignment systems with software-based correction. Instead of using mechanical adjustment mechanisms, precision stages, or complex positioning systems, the invention uses digital image processing and pixel manipulation to correct misalignment, thereby eliminating complex mechanical components while achieving high alignment precision.
Solution Approach 2:
The patent creates a digital model or map of the actual pixel positions and misalignment characteristics. By measuring the actual positions of pixels in the RGB display dies and creating a correction map, the system can digitally replicate the intended alignment without physical adjustment, effectively copying the ideal alignment state through software.
3Adaptability or versatility
If separate mono color displays are overlaid with an optical combiner, then full color display capability is achieved, but misalignment and color mixing problems occur
Solution Approach 1:
The patent implements feedback by measuring the actual output image from the overlaid RGB display dies and using this information to correct subsequent displays. The system captures the composite image, detects misalignment and color mixing errors, and uses this feedback to adjust the correction parameters, creating a closed-loop system that continuously optimizes alignment and color accuracy.
Solution Approach 2:
The patent performs preliminary measurement and correction setup before normal operation. During an initial calibration phase, the system measures the actual positions and characteristics of the RGB display dies, pre-computes correction values, and stores them in a lookup table. This preliminary action establishes the correction parameters that will be used during subsequent display operations, ensuring accurate color alignment from the start.
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
Achieves precise color alignment and improved image quality by correcting misalignments between RGB display dies, allowing for micro-level fabrication and enhanced performance in augmented reality applications.
Implementation Method 1
The collimated beams traverse through a waveguide system (total internal reflection) with localized grating portions acting as in and out couplers for the beams
Implementation Method 2
a first grating portion configured to couple in an incident light to the optical waveguide system and a second grating portion configured to couple out a transmitting light from the optical waveguide system
Implementation Method 3
the lens system is arranged in between the package and the optical waveguide system, configured to collimate the light of first color, the light of second color and the light of third color onto the first grating portion of the optical waveguide system
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A display system (10,40) is provided. In one embodiment, the display system (10) comprises a first display die (11) configured to emit light of a first color (12), a second display die (13) configured to emit light of a second color (14) and a third display die (15) configured to emit light of a third color (16). In addition, the display system (10) further comprises a lens system (17) and an optical waveguide system (18), wherein the optical waveguide system (18) comprises a first grating portion (19) configured to couple in an incident light to the optical waveguide system (18) and a second grating portion (20) configured to couple out a transmitting light from the optical waveguide system (18). Furthermore, the first display die (11), the second display die (13) and the third display die (15) are arranged in one package (32). Moreover, the lens system (17) is arranged in between the package (32) and the optical waveguide system (18), configured to collimate the light of first color (12), the light of second color (14) and the light of third color (16) onto the first grating portion (19) of the optical waveguide system (18).