Stereoscopic Display Subpixel Segmentation for Crosstalk Reduction
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Solution Overview
Problem
Stereoscopic image display devices using the glass method suffer from degraded visibility of 2D and 3D images due to crosstalk at vertical viewing angles and moiré interference caused by black stripes on the patterned retarder, which also reduce luminance by covering display panel pixels.
Innovation Solution
A stereoscopic image display device with a display panel comprising thin film transistors and divided into main and auxiliary subpixels, using a data driving circuit to supply data voltages and a gate driving circuit to manage gate pulses differently in 2D and 3D modes, eliminating the need for black stripes on the patterned retarder by utilizing active black subpixels for enhanced viewing angles and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If black stripes are formed on the patterned retarder to increase vertical viewing angle, then the vertical viewing angle is improved, but moiré interference occurs and 2D image visibility is degraded
Solution Approach 1:
The pixel structure is segmented into main subpixels and auxiliary subpixels. The auxiliary subpixels function as active black stripes to control light leakage, while the main subpixels display the actual image content. This segmentation allows the black stripe function to be integrated without creating moiré patterns from separate physical stripes on the retarder.
Solution Approach 2:
The auxiliary subpixels serve dual purposes: they act as black stripes for light blocking during 3D display mode, and simultaneously function as display pixels during 2D display mode. This self-service approach eliminates the need for separate black stripe structures that would cause moiré interference.
2Area of moving object
If black stripes are formed on the patterned retarder to increase vertical viewing angle, then the vertical viewing angle is improved, but 2D and 3D image visibility is degraded
Solution Approach 1:
The pixel structure is segmented into main subpixels and auxiliary subpixels. The auxiliary subpixels function as active black stripes to control light leakage, while the main subpixels display the actual image content. This segmentation allows the black stripe function to be integrated without creating moiré patterns from separate physical stripes on the retarder.
Solution Approach 2:
The auxiliary subpixels dynamically change their state based on the display mode. In 3D mode, they display black to block light leakage; in 2D mode, they display normal image content. This dynamic behavior maintains high image visibility while achieving wide viewing angle.
3Area of moving object
If black stripes are formed on the patterned retarder, then vertical viewing angle is improved, but luminance is reduced due to pixel coverage
Solution Approach 1:
The pixel structure is segmented into main subpixels and auxiliary subpixels. The auxiliary subpixels function as active black stripes to control light leakage, while the main subpixels display the actual image content. This segmentation allows the black stripe function to be integrated without creating moiré patterns from separate physical stripes on the retarder.
Solution Approach 2:
Only a portion of each pixel (the auxiliary subpixels) is used for light blocking, while the majority (main subpixels) remains available for light emission. This partial action approach maintains high luminance while achieving the light blocking function needed for wide viewing angle.
4Adaptability or versatility
If alternating display of left and right eye images is used for 3D display, then stereoscopic effect is achieved, but crosstalk occurs at vertical viewing angles
Solution Approach 1:
The pixel structure is segmented into main subpixels and auxiliary subpixels. The auxiliary subpixels are positioned to function as black stripes that block light leakage at vertical viewing angles, while the main subpixels display the alternating left and right eye images. This segmentation enables stereoscopic display without crosstalk.
Solution Approach 2:
The auxiliary subpixels act as an intermediary element between the display panel and the viewer's eyes. They selectively block light paths that would cause crosstalk while allowing the intended stereoscopic images to reach each eye, thereby enabling the stereoscopic effect without 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
This approach improves the display quality of both 2D and 3D images by reducing crosstalk and moiré, maintaining high luminance, and preventing increases in driving frequency and power consumption.
Implementation Method 1
The stereoscopic image display device alternately displays a left-eye image (L) and a right-eye image (R) on the display panel 3 and converts the characteristics of polarized light made incident to the polarization glasses 6 through the patterned retarder 5
Implementation Method 2
The stereoscopic image display device may spatially divide the left-eye image (L) and the right-eye image (R) viewed by the user by differentiating the characteristics of polarized light of the left-eye image (L) and the characteristics of polarized light of the right-eye image (R) in order to implement a 3D image
Data Source
AI summary
A stereoscopic image display device comprises: a display panel including thin film transistors (TFTs) formed at crossings of data lines and gate lines and m×n (m and n are positive integers) number of pixels divided into main subpixels and auxiliary subpixels; a data driving circuit supplying a data voltage of a two-dimensional (2D) image to the data lines in a 2D mode and supplying a data voltage of a three-dimensional (3D) image to the data lines in a 3D mode; and a gate driving circuit simultaneously supplying gate pulses to a pair of gate lines including neighboring gate lines in the 2D mode and simultaneously supplying gate pulses to even-numbered gate lines in the 3D mode.