Active Black Stripe Subpixels for 3D Display Viewing Angle
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Solution Overview
Problem
Existing image display devices that implement 3D images using polarized glasses type methods suffer from low luminance and significant crosstalk due to the narrow vertical viewing angle, which is exacerbated by attempts to widen this angle, such as the use of black stripes, resulting in a reduction in 2D image luminance.
Innovation Solution
An image display device with a display panel, a patterned retarder, and a control voltage generator that selectively applies different DC control voltages to subpixels to manage the display of 2D and 3D images, utilizing auxiliary display units to function as active black stripes in 3D mode without reducing 2D image luminance, thereby widening the vertical viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If black stripes are formed in the patterned retarder to widen the vertical viewing angle, then the vertical viewing angle of the 3D image is improved, but the luminance of the 2D image is reduced
Solution Approach 1:
The subpixels are divided into a main display unit and an auxiliary display unit. The auxiliary display unit functions as an active black stripe in 3D mode to widen the vertical viewing angle, while the main display unit maintains full luminance for 2D mode. This segmentation allows different regions to serve different functions in different modes, resolving the contradiction between viewing angle and luminance.
Solution Approach 2:
The auxiliary display unit dynamically changes its function based on the display mode. In 3D mode, it acts as a black stripe to expand the vertical viewing angle. In 2D mode, it is turned off and does not reduce luminance. This dynamic behavior allows the system to optimize for either viewing angle or luminance depending on the mode, eliminating the permanent trade-off.
2Area of stationary object
If the vertical viewing angle is widened using black stripes, then the viewing angle is improved, but crosstalk is generated due to the narrow original angle
Solution Approach 1:
By segmenting the subpixels into main and auxiliary units, the auxiliary unit can serve as a dynamic black stripe that prevents crosstalk in 3D mode by blocking light in specific regions, while the main unit maintains image quality. This segmentation enables effective crosstalk prevention without permanently sacrificing viewing angle or luminance.
Solution Approach 2:
The system changes the operational parameters of the auxiliary display unit based on the mode. In 3D mode, it is activated to prevent crosstalk by controlling light transmission. In 2D mode, it is deactivated to maintain luminance. This parameter change allows the system to prevent crosstalk only when necessary, without generating permanent harmful effects.
3Area of stationary object
If the auxiliary display unit is fully turned on in 3D mode, then the vertical viewing angle is widened, but the luminance of the 2D image is reduced
Solution Approach 1:
The auxiliary display unit is only partially activated when needed. In 3D mode, it is turned on to provide the black stripe function for widening the vertical viewing angle. In 2D mode, it remains completely off to avoid any impact on luminance. This partial action approach ensures that the viewing angle expansion is achieved only when necessary, without excessive impact on luminance.
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 widens the vertical viewing angle for 3D images without compromising the luminance of 2D images, reducing crosstalk and maintaining image quality across different viewing angles.
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
An image display device includes a display panel which includes a plurality of subpixels and selectively displays a 2D image and a 3D image, a patterned retarder for dividing light from the display panel into first polarized light and second polarized light, and a control voltage generator, which generates a first DC control voltage of an OFF-level and a second DC control voltage of a slight-on level, which is higher than the OFF-level and is lower than a full-on level, and selectively outputs the first DC control voltage and the second DC control voltage depending on a driving mode.