Stereoscopic Display Crosstalk Compensation via Frame Frequency Detection
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Solution Overview
Problem
Existing stereoscopic image displays face challenges in reducing 3D crosstalk, particularly when transitioning between different input frame frequencies, such as from the NTSC to the PAL format, due to variations in liquid crystal response times, leading to luminance deviations and ghosting effects.
Innovation Solution
A stereoscopic image display system that includes a crosstalk compensation circuit capable of detecting input frame frequencies and performing over driving control (ODC) modulation, followed by multiplication of the compensated data by a predetermined constant value, specifically determined for each frame frequency, to effectively reduce crosstalk across various frame rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If over driving control (ODC) modulation is applied to improve liquid crystal response characteristic, then response time is improved, but luminance deviation is generated depending on previous frame gray level
Solution Approach 1:
The patent applies preliminary action by performing ODC modulation in advance to improve liquid crystal response time before the actual image display. The compensation value is calculated based on previous frame data and applied to current frame data, proactively addressing the response delay issue before it manifests as visible ghosting or crosstalk.
Solution Approach 2:
The patent implements feedback by comparing previous frame data with current frame data to determine the appropriate compensation value. The system continuously monitors frame transitions and adjusts the ODC modulation strength based on the detected changes, creating a closed-loop control system that adapts to varying image content and maintains luminance uniformity.
2Speed
If existing ODC modulation method is used, then response characteristic is improved, but 3D crosstalk cannot be reduced due to luminance deviation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the compensation value based on the detected frame frequency (NTSC 60Hz vs. PAL 50Hz). The system modifies the ODC modulation parameters to match the specific timing requirements of different frame rates, ensuring optimal response characteristic while eliminating luminance deviation that causes 3D crosstalk.
3Adaptability or versatility
If frame frequency changes from NTSC to PAL format, then display adaptability is improved, but liquid crystal response timing becomes mismatched causing crosstalk
Solution Approach 1:
The patent implements dynamics by making the ODC modulation parameters adaptive to different frame frequencies. The system dynamically detects whether the input is NTSC (60Hz) or PAL (50Hz) format and automatically adjusts the compensation timing and magnitude accordingly, ensuring reliable crosstalk reduction across different display standards.
Data Source
AI summary
A stereoscopic image display and a method for compensating for a crosstalk of the stereoscopic image display are disclosed. The stereoscopic image display includes a crosstalk compensation circuit and a display element. The crosstalk compensation circuit detects an input frame frequency, performs over driving control (ODC) modulation on 3D data to firstly compensate for a crosstalk of the 3D data, and multiplies the firstly compensated 3D data by a constant value, which is previously determined depending on the detected input frame frequency and is greater than zero and equal to or less than 1, to finally compensate for the crosstalk of the 3D data. The display element displays left eye image data and right eye image data included in the finally compensated 3D data in a time division manner.