Liquid Crystal Display Data Modulation for 3D Crosstalk Reduction
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Solution Overview
Problem
The existing overdriving method for liquid crystal displays in stereoscopic image display devices causes brightness differences and 3D crosstalk when applied to 3D images, as it struggles to accurately represent grayscale values due to the temporal division of left and right eye images.
Innovation Solution
A data modulation method that compares and modulates left and right eye image data across specific frame periods to ensure consistent grayscale representation, using preliminary and secondary modulation values to adjust data values in liquid crystal displays, thereby minimizing brightness differences and 3D crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the overdriving method is applied to 3D images, then the response speed of liquid crystal is improved, but brightness difference and 3D crosstalk occur
Solution Approach 1:
The patent segments the frame periods into four groups (4N, 4N+1, 4N+2, 4N+3) and applies different overdriving modulation strategies to left eye and right eye images based on their temporal positions. This segmentation allows independent optimization of modulation values for each eye's images, preventing brightness differences and 3D crosstalk while maintaining response speed improvement.
Solution Approach 2:
The patent applies local quality by using different modulation values for different frame periods and different eyes. Specifically, it uses preliminary modulation values for certain frame periods and secondary modulation values for others, creating localized optimization tailored to the specific temporal and spatial characteristics of each image data type.
2Speed
If the overdriving method is applied to 3D images, then the response speed of liquid crystal is improved, but grayscale representation accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing appropriate modulation values in lookup tables before actual image processing. The system determines which modulation values to apply based on the frame period and compares current frame data with previous frame data, selecting preliminary modulation values that ensure accurate grayscale representation while maintaining fast response.
Solution Approach 2:
The patent implements feedback by comparing current frame image data with previous frame image data to determine the appropriate modulation values. This feedback mechanism allows the system to adapt the modulation strategy based on the actual image content changes, ensuring accurate grayscale representation across different temporal conditions.
Data Source
AI summary
A data modulation method, comparing left eye image data during a (4N+1)-th frame period with previous frame data, selecting a preliminary modulation value for a left eye image, preliminarily modulating the left eye image data during the (4N+1)-th frame period to reach the preliminary modulation value for the left eye image, and secondarily modulating left eye image data during a (4N+2)-th frame period to reach the preliminary modulation value for the left eye image or a modulation value smaller than the preliminary modulation value.