Stereoscopic Display Black Frame Insertion for 3D Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Stereoscopic image display devices driven at 120 Hz frame frequency experience 3D crosstalk due to slow liquid crystal response times, requiring higher frame frequencies or costly circuit upgrades to reduce crosstalk.
Innovation Solution
A method where the display panel alternately addresses left and right eye image data during specific frame periods, with a black grayscale voltage applied during designated periods to discharge previous image data, minimizing overlap and crosstalk without increasing frame frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the frame frequency is increased to 240 Hz to reduce 3D crosstalk, then the 3D crosstalk is reduced, but the costs of driving circuits increase
Solution Approach 1:
The patent applies periodic action by inserting a black grayscale frame between left and right eye image frames. This periodic insertion of black frames at specific intervals (every other frame) allows the liquid crystal to fully reset, eliminating residual image effects without requiring continuous high-frequency operation. The periodic black frame insertion effectively reduces 3D crosstalk while maintaining 120 Hz operation for actual image content, avoiding the need for expensive 240 Hz circuit upgrades.
2Object-affected harmful factors
If the frame frequency is increased to 240 Hz to reduce 3D crosstalk, then the 3D crosstalk is reduced, but the frame period becomes shorter requiring higher driving frequency
Solution Approach 1:
The patent applies preliminary action by inserting a black grayscale frame before the next monocular image frame to ensure the liquid crystal cells are fully reset. This preliminary black frame preparation prevents residual voltage from previous frames from affecting the next image, thereby eliminating 3D crosstalk. By performing this reset action in advance within the existing 120 Hz frame period structure, the patent avoids the need to shorten frame periods or increase driving frequency to 240 Hz.
3Object-affected harmful factors
If black grayscale voltage is applied during the entire frame period to reduce crosstalk, then the 3D crosstalk is reduced, but the image display time is reduced
Solution Approach 1:
The patent applies segmentation by dividing the frame period into distinct segments: one segment for displaying left or right eye image data, and another segment for applying black grayscale voltage. Specifically, the black grayscale frame is inserted only during periods when the corresponding eye's shutter is closed, separating the image display function from the reset function in time. This segmentation ensures that black grayscale voltage is applied only when necessary for crosstalk reduction, maximizing image display time while effectively eliminating 3D crosstalk.
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
Enables 3D image display at 120 Hz frame frequency while reducing 3D crosstalk, thereby maintaining image quality without the need for high-frequency upgrades, thus lowering circuit costs.
Implementation Method 1
VF indicates Freederick transition voltage when the liquid crystal molecules starts a tilted motion
Implementation Method 2
τf indicates a falling time when the liquid crystal is recovered to an original position due to the elastic recovery after the liquid crystal stops being applied with a voltage
Data Source
AI summary
A stereoscopic image display device comprises a display panel; a panel driving unit configured to address left eye image data in all pixels of the display panel during a data addressing period set in an N-th (where N is a natural number) frame period and adjust voltages of all the pixels of the display panel to a black grayscale voltage during a black grayscale inserting period set in the N-th frame period, address right eye image data in all the pixels of the display panel during a data addressing period set in a (N+1)-th frame period and adjust voltages of all the pixel of the display panel to the black grayscale voltage during a black grayscale inserting period set in the (N+1)-th frame period; and a controller configured to supply the left eye image data, and the right eye image data to the panel driving unit and control operation timings of the panel driving unit.