Dual LCD Moiré Reduction via Spatial Blur Algorithm
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Solution Overview
Problem
Dual LCD devices suffer from a lower contrast ratio in dark environments due to the moiré effect caused by pixel deviation between stacked LCD panels, which degrades image quality, and existing solutions like diffuser sheets increase manufacturing complexity and cost.
Innovation Solution
A dual LCD device configuration with a gray LCD and a color LCD stacked together, utilizing a dual cell dimming algorithm that calculates and spatially blurs gray cell pixel data and compensates color cell pixel data to alleviate the moiré effect, eliminating the need for a diffuser sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dual cell LCD structure is adopted to improve contrast ratio, then the black luminance is reduced and contrast ratio is improved, but a moiré effect is generated due to pixel deviation between panels
Solution Approach 1:
The patent introduces a diffuser sheet as an intermediary component between the two LCD panels. This diffuser sheet scatters the light passing through the panels, effectively blurring the periodic interference pattern caused by pixel deviation and eliminating the moiré effect while preserving the improved contrast ratio achieved by the dual cell structure
Solution Approach 2:
The patent changes the optical parameters of the light path by introducing the diffuser sheet, which modifies the light distribution and scattering characteristics. This parameter change transforms the coherent light interference that causes moiré patterns into scattered light that eliminates the periodic interference pattern
2Object-affected harmful factors
If a diffuser sheet is added to eliminate the moiré effect, then the moiré effect is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The diffuser sheet serves as a simple intermediary optical element that can be integrated into the existing LCD stack without requiring complex manufacturing processes. It is a standard optical component that adds minimal complexity while effectively solving the moiré problem
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 dual cell dimming algorithm effectively reduces the moiré effect without requiring a diffuser sheet, simplifying the manufacturing process and reducing costs while maintaining improved contrast ratios in dark environments.
Implementation Method 1
a moiré effect caused by light interference between the gray LCD and the color LCD
Data Source
AI summary
A dual LCD device includes a gray LCD, a color LCD stacked on the gray LCD, a backlight assembly disposed at the rear of the gray LCD, and a controller. The controller is configured to receive an input image data and then respectively output a gray cell pixel data and a color cell pixel data to the gray LCD and the color LCD based on a dual cell dimming algorithm. The dual cell dimming algorithm is configured to alleviate a moiré effect caused by light interference between the gray LCD and the color LCD. The dual cell dimming algorithm includes: calculating an initial gray cell pixel data based on the input image data; calculating the gray cell pixel data by spatially blurring the initial gray cell pixel data; and calculating the color cell pixel data by compensating the gray cell pixel data.