Overdrive Device Luminance Lookup Table Reduces 3D Crosstalk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active shutter 3D systems face issues with insufficient response time and unsatisfactory quality due to liquid crystal molecules' response time limitations, leading to crosstalk in 3D display techniques.
Innovation Solution
An overdrive device is introduced that includes a training unit to establish a luminance difference look-up table, an analysis unit to adjust grayscale levels, and an overdrive unit to provide voltage for the display device, ensuring accurate display of first and second viewing angle images within specific display periods, thereby reducing crosstalk and enhancing 3D display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal molecules are used in the display device to achieve 3D display effects, then the display device can alternately display images of different viewing angles, but the response time of liquid crystal molecules is insufficient resulting in crosstalk and unsatisfactory quality
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal overdrive voltages in a lookup table during a training phase. The training unit measures actual luminance values for different grayscale levels and pre-determines the optimal overdrive voltages that minimize crosstalk. During normal operation, the analysis unit simply retrieves pre-computed values from the lookup table, avoiding real-time complex calculations and ensuring rapid response while maintaining high display quality.
Solution Approach 2:
The patent implements feedback through a closed-loop measurement and adjustment system. The training unit measures actual luminance values displayed by the display device and compares them with target luminance values. Based on these measurements, the system calculates luminance differences and determines optimal overdrive voltages. This feedback mechanism allows the system to adapt to actual display conditions and optimize performance dynamically.
2Productivity
If the display device alternately displays images of different viewing angles to achieve 3D effects, then left and right eyes receive appropriate images, but liquid crystal molecules encounter insufficient response time causing crosstalk
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the overdrive voltage based on the grayscale levels of adjacent images. The system changes the voltage parameter from standard operating levels to optimized overdrive levels during transitions between different viewing angle images. This parameter adjustment optimizes the liquid crystal response time to minimize crosstalk while maintaining high switching speed for 3D display functionality.
3Reliability
If overdrive voltage is applied to improve liquid crystal response time, then crosstalk is reduced, but the complexity of the driving mechanism increases
Solution Approach 1:
The patent reduces driving mechanism complexity by pre-computing optimal overdrive voltages during a training phase and storing them in a lookup table. During normal operation, the system simply retrieves pre-computed values based on grayscale level combinations, eliminating the need for complex real-time calculations. This preliminary action approach maintains high response time performance while significantly reducing operational complexity.
Solution Approach 2:
The system implements self-service by automatically measuring luminance values, calculating optimal overdrive voltages, and generating lookup tables without requiring manual intervention or complex external equipment. The training unit autonomously performs characterization measurements and generates the necessary driving parameters, simplifying the overall system architecture while maintaining high performance.
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 overdrive device effectively reduces crosstalk and improves 3D display quality by adjusting grayscale levels and providing optimal overdrive voltage, ensuring that the display device can handle the required luminance differences between viewing angles, thus enhancing the overall 3D experience.
Implementation Method 1
liquid crystal molecules in the display device may encounter insufficient response time to result in crosstalk
Implementation Method 2
an overdrive unit that provides an overdrive voltage for driving the display device according to the corrected pixel data
Data Source
AI summary
An overdrive device includes a training unit, an analysis unit and a Contrast adjustment unit. The training unit establishes a luminance difference look-up table (LUT) having an R2 number of luminance differences. Each of the R2 number of luminance differences represents a luminance difference between a measured display luminance value and a target luminance value of a display device when each of first and second viewing angle images correspond to any value of a grayscale range R. With respect to first and second viewing angle input image data, for pixel data therein corresponding to a same pixel position, the analysis unit looks up the luminance difference LUT to obtain a looked-up luminance difference, and accordingly calculates a luminance difference index. The contrast adjustment unit partially adjusts the grayscale of the second viewing angle image according to the luminance value index to obtain headroom for an overdrive operation.