Stereoscopic Display Crosstalk Reduction via Frame Data Modulation
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Solution Overview
Problem
Stereoscopic image displays using the glasses type method experience 3D crosstalk, where ghosting phenomena occur due to the leakage of left eye image data into the right eye and vice versa, affecting the perceived gray levels and gamma characteristic of the images.
Innovation Solution
A stereoscopic image display system that modulates left and right eye image data using modified values based on a comparison between current and previous frame periods, applying an analog gamma compensation voltage to the data lines and synchronizing gate pulses, to adjust the luminance and reduce crosstalk, with specific gamma curves (C1 to C4) implemented to correct gray level distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division method is used to display left and right eye images, then stereoscopic effect is improved, but 3D crosstalk and ghosting phenomenon occur
Solution Approach 1:
The patent applies preliminary action by adjusting the gray levels of the current frame image based on the gray levels of the previous frame image before display. The data modulation unit modifies the current frame data in advance by comparing it with the previous frame data and applying appropriate gray level adjustments, thereby preventing 3D crosstalk and ghosting phenomena before they occur during the time division display of left and right eye images.
2Stability of the object's composition
If gray level of current image is affected by previous image, then ghosting phenomenon occurs, but image transition smoothness is improved
Solution Approach 1:
The patent applies local quality by differentiating the treatment of gray levels based on the specific transition conditions between frames. The data modulation unit selectively adjusts gray levels only when necessary (when current frame gray level differs from previous frame), and applies different adjustment amounts based on the magnitude of the difference, thereby maintaining image transition smoothness while preserving gray level accuracy where needed.
Solution Approach 2:
The patent applies parameter changes by dynamically modifying the gray level parameters of the current frame image based on the previous frame's gray levels. The system changes the gray level values to satisfy specific gamma curves (C1-C4) that define the relationship between previous and current frame gray levels, thereby controlling the transition characteristics to reduce ghosting while maintaining visual smoothness.
3Reliability
If gamma compensation is applied to reduce crosstalk, then 3D image quality is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing the gamma compensation and gray level adjustment functions within the display device itself, specifically in the data modulation unit. The system uses the previous frame image data stored in its own memory to automatically adjust the current frame data, eliminating the need for external processing equipment and reducing overall system complexity while maintaining 3D image quality.
Data Source
AI summary
A stereoscopic image display and a method for driving the same are disclosed. The stereoscopic image display includes a display panel, that displays data of a 2D image in a 2D mode and display data of a 3D image in a 3D mode in a time division manner, and a data modulation unit that previously stores modified values satisfying a luminance of a predetermined gray level and modulates left eye image data or right eye image data input during a current frame period to a modified value selected based on the result of a comparison between right/left eye image data input during a previous frame period and the left/right eye image data of the current frame period using the previously stored modified values.