Saturation-Dependent Image Splitting for Dual Layer LCDs
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Solution Overview
Problem
Single panel LCDs have limited dynamic range and struggle to accurately reproduce dark areas and saturated dark colors, leading to reduced image quality and parallax issues in multi-layer display devices.
Innovation Solution
A method that optimizes the modulation of monochromatic and color modulation panels in a dual layer LCD by determining color saturation values to drive the panels, minimizing parallax through radial distortion, and maximizing the use of the back liquid crystal panel to expand the color gamut and improve dark color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dual layer LCD is implemented to improve black level and grayscale accuracy, then the dynamic range and grayscale reproduction are improved, but parallax problems occur when viewing off-axis and saturated dark colors cannot be displayed
Solution Approach 1:
The patent divides the image into luminance and chroma components, processing them through separate liquid crystal panels. The luminance image drives the first panel while the chroma image drives the second panel, allowing independent optimization of each panel's function and eliminating parallax artifacts through selective modulation.
Solution Approach 2:
The patent applies different modulation strategies to different regions of the display based on local color saturation requirements. By determining saturation values for each pixel or panel element, the system optimizes the modulation depth of each panel locally, ensuring dark saturated colors are reproduced accurately without introducing parallax errors in other regions.
2Adaptability or versatility
If the front liquid crystal panel is used to produce color, then color gamut is improved, but parallax artifacts and halos are experienced by viewers
Solution Approach 1:
The patent separates color information processing from luminance processing by directing chroma signals to the front panel and luminance signals to the back panel. This segmentation allows the front panel to contribute to color gamut while the back panel handles luminance modulation, reducing the interaction that causes parallax artifacts.
Solution Approach 2:
The patent applies partial modulation to the front panel by using saturation-dependent drive values. The front panel is modulated only to the extent necessary to produce saturated colors, while the back panel handles the majority of the luminance modulation, minimizing the front panel's contribution to parallax artifacts while maintaining color gamut.
3Illumination intensity
If the monochromatic modulation panel is modulated to produce dark colors, then black level is improved, but saturated dark colors cannot be reproduced
Solution Approach 1:
The patent divides the color reproduction task between two panels: the back panel handles luminance modulation for dark blacks, while the front panel handles chroma modulation for saturated colors. By combining the outputs of both panels, the system achieves both deep blacks and saturated dark colors that neither panel could produce alone.
Solution Approach 2:
The patent creates a composite display system where two liquid crystal panels with different characteristics work together. The back panel provides deep luminance attenuation for black levels, while the front panel adds color saturation, creating a composite effect that reproduces saturated dark colors without compromising black level performance.
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
Enhances image quality by reproducing dark saturated colors and reducing parallax artifacts, expanding the available color gamut and improving dynamic range in multi-layer display devices.
Implementation Method 1
A dual layer LCD is able to improve the black level of an LCD by stacking two liquid crystal panels in a series configuration. In comparison to a single panel LCD, a dual layer LCD is able to produce a more accurate grayscale by modulating the light from a light source twice.
Data Source
AI summary
Systems, methods, and computer readable media that improve the gamut size for a multi-layer display. Various embodiments receive a color input value indicative of a target display color associated with an input image and determine a color saturation value for the received color input value. Based on the color saturation value, a drive value for a monochromatic modulation panel and a drive value for a color modulation panel may be determined. The various embodiments can then drive the monochromatic and color modulation panel according to the drive values. The monochromatic modulation panel is not modulated until the color modulation panel is driven to full illumination.