Waveform Shading Lines in Dual-Panel Display for Moire Reduction
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from poor picture contrast and dark-state light leakage due to structural characteristics, and while dual-panel driving techniques improve contrast and luminance range, they are prone to moire and rainbow stripes, affecting display quality.
Innovation Solution
A display panel design featuring a dimming liquid crystal panel with shading lines in a waveform pattern stacked with a display liquid crystal panel, where the shading lines have a specific phase difference and overlap with the grid structure to minimize moire and rainbow stripes, enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dual-panel driving technique is used to improve contrast and luminance range, then picture contrast is improved, but moire and rainbow stripes appear affecting display quality
Solution Approach 1:
The patent applies curved waveform shading lines instead of straight lines in the grid structure. The shading lines extend in a curved waveform pattern with a specific phase difference between adjacent lines, which disrupts the regular interference patterns that cause moire and rainbow stripes while maintaining the contrast improvement benefits of dual-panel driving
Solution Approach 2:
The patent introduces local variations in the grid structure by applying different waveform phases to different regions. The phase difference parameter varies locally across the display panel, creating non-uniform patterns that prevent the formation of large-scale interference patterns (moire stripes) while maintaining local contrast performance
2Illumination intensity
If dual-panel driving technique is used to expand luminance range, then display quality is improved, but rainbow stripes appear affecting viewing experience
Solution Approach 1:
The curved waveform pattern of the shading lines scatters and redistributes light in a way that prevents the formation of rainbow stripes. The continuous curvature disrupts the periodic interference patterns that would otherwise create color separation effects, while the dual-panel structure maintains the expanded luminance range
3Object-affected harmful factors
If waveform phase difference is optimized to reduce moire stripes, then display quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a quantitative range for the waveform phase difference parameter (0 < |Δφ| < π), providing a manufacturing tolerance window. This parameter optimization balances the need to eliminate moire stripes with practical manufacturing capabilities, allowing for reasonable variations while maintaining effectiveness
Solution Approach 2:
The patent combines multiple elements (curved waveform pattern, phase difference control, dual-panel structure) into a composite solution. The interaction of these elements works synergistically to reduce moire stripes, where the phase difference parameter provides robustness against manufacturing variations
Data Source
AI summary
The present disclosure relates to a display panel and a display device. The display panel comprises: a display liquid crystal panel comprising a plurality of sub-pixels defined by a first grid structure and arranged in an array; a dimming liquid crystal panel located on a light incident side of the display liquid crystal panel and stacked with the display liquid crystal panel, the dimming liquid crystal panel comprising a plurality of dimming pixels defined by a second grid structure and arranged in an array; wherein the second grid structure comprises a plurality of shading lines which extend in a waveform along a row direction and have the same period, and a waveform phase difference Δϕ of any two adjacent shading lines meets: 0<|Δϕ|<π.