Stereoscopic Display Synchronization via Polarization Switching
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Solution Overview
Problem
Glasses type stereoscopic image display devices experience pseudo-stereoscopic vision due to unsynchronized display of left and right eye images caused by unstable initial drive or erroneous operation of driving circuits, leading to incorrect order of image display.
Innovation Solution
A stereoscopic image display device with a polarization switching element and a controller that uses scan electrode lines to synchronize the polarization characteristics of light traveling to polarization glasses by varying voltages supplied to these lines, ensuring correct synchronization of left and right eye images through identification codes inserted into pixel data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the liquid crystal display sequentially writes data from first line to last line to display an image, then the image can be displayed on the display device, but the response time delay causes pseudo-stereoscopic vision in boundary portions where left and right eye images change
Solution Approach 1:
The patent applies preliminary action by pre-positioning the polarization switching element to switch polarization characteristics in advance before the liquid crystal display completes its sequential data writing. The switching retarder is controlled to alternate polarization states (right-circular for odd frames, left-circular for even frames) before the image data is fully displayed, ensuring that when the boundary portions are displayed, the correct polarization state is already in place, preventing pseudo-stereoscopic vision.
2Adaptability or versatility
If the display device alternately displays left and right eye images, then stereoscopic image can be displayed, but unstable initial drive or erroneous operation of driving circuits causes incorrect order of image display and desynchronization with polarization switching element
Solution Approach 1:
The patent implements feedback by using frame identification signals to monitor and control the display sequence. The controller receives frame identification information indicating whether the current frame is odd or even, and uses this feedback to control the polarization switching element accordingly. This closed-loop control ensures that regardless of unstable initial drive or circuit errors, the polarization state always matches the correct eye image (right-circular for odd frames showing right eye image, left-circular for even frames showing left eye image), maintaining synchronization and preventing pseudo-stereoscopic vision.
3Manufacturing precision
If the switching retarder switches polarization characteristic of light incident on polarization glasses, then left and right eye images can be displayed without resolution reduction, but the polarization switching must be perfectly synchronized with image display to avoid pseudo-stereoscopic vision
Solution Approach 1:
The patent uses frame identification signals as an intermediary to mediate between the display device and the polarization switching element. Instead of directly synchronizing the complex polarization switching with the sequential data writing process, the frame identification signal serves as a simple intermediary carrier that conveys the frame sequence information (odd/even) to the controller, which then controls the polarization switching element. This intermediary approach simplifies the synchronization control while maintaining perfect coordination between image display and polarization switching, enabling high resolution stereoscopic display without pseudo-stereoscopic vision.
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 solution effectively synchronizes left and right eye images, preventing pseudo-stereoscopic vision and ensuring accurate stereoscopic viewing by controlling the voltage of scan electrode lines based on identification codes, thus stabilizing the image display.
Implementation Method 1
a polarization switching element between the display device and the polarization glasses, the polarization switching element including a plurality of scan electrode lines, the polarization switching element switching a polarization characteristic of light travelling to the polarization glasses according to a voltage supplied to the scan electrode lines
Implementation Method 2
When the liquid crystal display starts to be charged to the data, liquid crystal molecules of the liquid crystal display react and start to move. Because of such a delay of a response time
Data Source
AI summary
A stereoscopic image display device and a method of driving the same are disclosed. The stereoscopic image display device includes a display device, polarization glasses, a polarization switching element that includes a plurality of scan electrode lines and switches a polarization characteristic of light travelling to the polarization glasses according to a voltage supplied to the scan electrode lines, a driver supplying a first voltage synchronized with a right eye image displayed on the display device and a second voltage synchronized with a left eye image displayed on the display device to the scan electrode lines, and a controller controlling the driver so that a voltage of the scan electrode lines varies from the first voltage to the second voltage along a line of the display device in which the right eye image and the left eye image change.