Stereoscopic Display Pixel Segmentation for Luminance and Crosstalk
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Solution Overview
Problem
Existing stereoscopic image displays, particularly polarized glasses type, suffer from low luminance and significant 3D crosstalk when viewed at vertical angles due to parallax issues between the liquid crystal display panel and patterned retarder, and previous solutions like active black stripes complicate gate driver configuration and reduce luminance.
Innovation Solution
A stereoscopic image display with a display panel divided into main and auxiliary units, using a patterned retarder to separate polarized light and a discharge control TFT to manage voltage levels for 2D and 3D modes, maintaining the same number of gate lines and improving luminance and vertical viewing angle without additional complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black stripes are formed on the patterned retarder to solve vertical viewing angle crosstalk, then 3D crosstalk is reduced, but luminance of 2D and 3D images is reduced
Solution Approach 1:
Each pixel is divided into two independent sub-pixels: a first sub-pixel for displaying 2D images and a second sub-pixel for displaying 3D images. This segmentation allows the 3D image to be displayed only on the second sub-pixel while the first sub-pixel displays the 2D image, eliminating the need for black stripes that would reduce overall luminance.
Solution Approach 2:
The patent applies different display functions to different parts of the same pixel structure. The first sub-pixel is optimized for 2D image display with higher aperture ratio, while the second sub-pixel is optimized for 3D image display with the patterned retarder. This local differentiation allows each sub-pixel to perform its specific function efficiently without compromising overall luminance.
2Object-affected harmful factors
If width of black matrices is increased to reduce vertical viewing angle crosstalk, then 3D crosstalk is reduced, but aperture ratio is reduced leading to lower luminance
Solution Approach 1:
The pixel is segmented into two sub-pixels, allowing the 3D image to be confined to the second sub-pixel. This eliminates the need for extensive black matrices that would otherwise be required to prevent crosstalk, thereby maintaining a higher aperture ratio and luminance.
3Object-affected harmful factors
If each pixel is divided into two parts with active black stripe to improve vertical viewing angle, then 3D crosstalk is reduced, but gate driver configuration becomes complicated
Solution Approach 1:
Both the first and second sub-pixels share common control lines including the gate line, data line, and common electrode line. This merged control structure allows both sub-pixels to be driven by the same signal lines, significantly reducing the complexity of the gate driver configuration compared to completely independent control of each sub-pixel.
Solution Approach 2:
The common electrode line serves both sub-pixels simultaneously, and the gate line controls both TFTs. This multi-functionality of control lines reduces the overall number of control signals required and simplifies the driver circuit design while still enabling independent display functionality for 2D and 3D modes.
4Adaptability or versatility
If LC shutter glasses are used with short data-on time to achieve 3D image, then 3D stereoscopic effect is achieved, but luminance of 3D image becomes low
Solution Approach 1:
The patent replaces the mechanical shuttering mechanism of LC shutter glasses with an optical separation method using a patterned retarder. The patterned retarder separates left and right eye images by polarization direction, allowing continuous light transmission without the need for rapid shuttering, thereby maintaining high luminance while achieving the 3D stereoscopic effect.
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 enhances 2D image luminance and 3D image vertical viewing angle without increasing the number of gate lines, reducing 3D crosstalk and maintaining aperture ratio, thus providing a more effective stereoscopic experience.
Implementation Method 1
a patterned retarder configured to divide light from the display panel into first polarized light and second polarized light
Data Source
AI summary
A stereoscopic image display includes a display panel including pixels and a patterned retarder. Each pixel includes a main display unit including a first pixel electrode connected to a data line through a first thin film transistor (TFT) and a first common electrode connected to an upper common line, an auxiliary display unit including a second pixel electrode, which is connected to the data line through a second TFT and is connected to the upper common line through a discharge control TFT, and a second common electrode connected to the upper common line, and a line unit between the main display unit and the auxiliary display unit. The line unit includes a gate line, through which a scan pulse is applied to the first and second TFTs, and a discharge control line, through which a discharge control voltage is applied to the discharge control TFT.