LCD Ghost Image Reduction via Boundary Grayscale Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs) face issues with ghost images and poor display quality due to differences in grayscale values between sub-images, leading to unwanted luminance variations and reduced clarity.
Innovation Solution
A method is introduced where a display device comprising a liquid crystal light control panel and an LCD panel adjusts grayscale values of specific regions based on threshold comparisons, ensuring that the grayscale values of adjacent regions are adjusted to minimize luminance differences and prevent ghost images, using a controller to manage the display of sub-images and light control images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grayscale values of adjacent regions are not adjusted, then the display structure remains simple, but ghost images occur and display quality deteriorates due to luminance variations at boundaries
Solution Approach 1:
The patent applies local quality by adjusting grayscale values specifically in boundary regions between different light control regions, while leaving other regions unchanged. This targeted approach eliminates ghost images at boundaries without requiring global grayscale adjustment, thus improving display quality while maintaining relatively simple overall control logic.
Solution Approach 2:
The patent implements preliminary action by pre-defining boundary regions between light control regions and pre-setting adjustment rules for these boundaries. Before actual image display, the system identifies where boundaries exist and prepares grayscale adjustment parameters, enabling proactive prevention of ghost images rather than reactive correction.
2Reliability
If grayscale values are adjusted to eliminate ghost images, then display quality improves, but the processing complexity and control difficulty increase
Solution Approach 1:
The patent segments the display region into multiple light control regions with distinct grayscale values, and further segments boundary regions between them for special handling. This segmentation allows independent control of different areas, making it easier to manage grayscale adjustments locally without affecting the entire display, thus reducing overall control difficulty.
Solution Approach 2:
The patent changes the grayscale parameter specifically in boundary regions to eliminate luminance discontinuities. By modifying this single parameter locally at boundaries rather than throughout the entire display, the system achieves image clarity improvement with minimal control complexity increase.
3Ease of operation
If uniform grayscale is maintained across all regions, then control is simple, but luminance variations at boundaries cause ghost images and reduce visual clarity
Solution Approach 1:
The patent maintains uniform grayscale control for most regions while applying local quality adjustments only at boundary regions. This approach preserves the simplicity of uniform control for the majority of the display area while locally addressing luminance variations that cause ghost images, thus minimizing loss of visual clarity.
Solution Approach 2:
The patent applies partial action by adjusting grayscale values only in the necessary boundary regions rather than across the entire display. This selective adjustment is sufficient to eliminate ghost images without requiring excessive grayscale manipulation, maintaining control simplicity while improving visual clarity.
Data Source
AI summary
Provided is a display method applicable to a display device, the display device including a liquid crystal light control panel and a liquid crystal display (LCD) panel stacked together, the method including: acquiring a first sub-image and a second sub-image of an image to be displayed on the LCD panel, a boundary of the first sub-image being in contact with a boundary of the second sub-image; and decreasing a grayscale value of a first region, which is in contact with a boundary of a second light control region, in a first light control region, in response to determining that a grayscale value of the second sub-image is greater than a grayscale threshold.