Stereoscopic Display Pixel Segmentation for Viewing Angle and Luminance
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Solution Overview
Problem
Conventional stereoscopic image displays using polarization glasses suffer from low luminance and significant 3D crosstalk due to narrow vertical viewing angles, with previous solutions either reducing luminance or increasing the number of TFTs, which can deteriorate data charging characteristics and aperture ratio.
Innovation Solution
The solution involves dividing each pixel into a main display section and an auxiliary display section, with the auxiliary section acting as an active black stripe, using a second switch TFT and a discharge control TFT to manage data charging and maintain equal kickback voltages across both sections, thereby improving data charging characteristics and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If black stripes are formed on the patterned retarder to prevent 3D crosstalk, then the vertical viewing angle is improved, but the luminance of 2D/3D images decreases
Solution Approach 1:
Each pixel is divided into two sections: a main display section for image output and an auxiliary display section functioning as an active black stripe. This segmentation allows the black stripe function to be integrated without adding separate structures that would block light, thereby maintaining luminance while achieving 3D crosstalk prevention
Solution Approach 2:
The auxiliary display section serves multiple functions: it acts as an active black stripe to prevent 3D crosstalk, maintains aperture ratio by being part of the pixel structure, and enables both 2D and 3D display modes. This multi-functionality resolves the contradiction by integrating the crosstalk prevention function without sacrificing luminance
2Speed
If the width of black matrix is increased to prevent 3D crosstalk, then the vertical viewing angle is improved, but the aperture ratio decreases
Solution Approach 1:
The pixel is segmented into main display section and auxiliary display section, where the auxiliary section provides the black stripe effect without requiring increased black matrix width. This maintains the aperture ratio while achieving the vertical viewing angle improvement
Solution Approach 2:
Instead of increasing black matrix width in the horizontal dimension, the solution uses the vertical dimension by dividing the pixel into upper and lower sections. The auxiliary display section in the lower portion provides the black stripe effect, avoiding aperture ratio reduction that would result from horizontal expansion
3Speed
If the number of TFTs is increased to implement active black stripe, then the vertical viewing angle is improved, but the data charging characteristics deteriorate
Solution Approach 1:
The auxiliary display section shares data line connections and uses the same liquid crystal cell structure as the main display section. By merging the control architecture and using shared components, the solution achieves active black stripe functionality without proportionally increasing the number of TFTs, thus maintaining data charging characteristics
4Manufacturing precision
If the capacitance of storage capacitor is increased to balance kickback voltage, then the luminance difference between main display section and active black stripe is reduced, but the aperture ratio decreases
Solution Approach 1:
Instead of changing the capacitance value (which would require larger capacitor area and reduce aperture ratio), the solution changes the approach by using equal capacitance values for both display sections and balancing the kickback voltage through the discharge control TFT and link pattern connection, thereby achieving luminance uniformity without aperture ratio reduction
Data Source
AI summary
A stereoscopic image display according to an embodiment includes: a main display section including a first liquid crystal cell connected to a data line through a first switch TFT and connected to a common line supplied with a common voltage and a first storage capacitor; and an auxiliary display section including a second liquid crystal cell connected to the data line through a second switch TFT and connected to the common line through a discharge control TFT and a second storage capacitor.