Display Panel Dithering Control for Low-Grayscale Artifact Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light emitting display devices suffer from visual artifacts such as stains and discoloration in low-grayscale areas, overshooting during pixel transitions, and color inconsistencies, leading to reduced image quality and increased processing demands.
Innovation Solution
A display device with a driving controller that adjusts image data using reference grayscales and dithering maps to prevent stains and discoloration, and a source driving circuit to convert the adjusted data into signals for display, enhancing image quality by applying offset or reference grayscales based on previous frame states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dithering is applied to low-grayscale areas, then visual artifacts such as stains and discoloration are reduced, but processing complexity increases
Solution Approach 1:
The display panel is divided into multiple dithering areas based on grayscale levels. The driving controller identifies low-grayscale areas and applies dithering processing selectively to those regions, while maintaining standard processing for high-grayscale areas. This segmentation approach reduces overall processing complexity while improving display quality in the most problematic regions.
Solution Approach 2:
Different processing methods are applied to different regions of the display panel. Low-grayscale areas receive dithering processing to prevent stains and discoloration, while high-grayscale areas use standard processing. This local differentiation optimizes processing efficiency by applying complex dithering only where visually necessary.
2Productivity
If pixels transition from off state to on state, then image display is enabled, but overshooting occurs causing brightness exceeding intended luminance
Solution Approach 1:
The driving controller applies preliminary processing to image data before it reaches the display panel. By pre-adjusting the data and applying dithering maps in advance, the system prevents overshooting from occurring during pixel transitions, ensuring that brightness levels remain within the intended luminance range while maintaining full image display capability.
3Measurement precision
If red, green, and blue components are adjusted independently, then color accuracy is improved, but color consistency and management become more difficult
Solution Approach 1:
The driving controller integrates the adjustment of red, green, and blue components into a unified processing framework. By applying dithering maps and grayscale adjustments simultaneously across all color components rather than independently, the system maintains color accuracy while simplifying color management through coordinated control.
Data Source
AI summary
A display device includes a driving controller, a source driving circuit, and a display panel. The driving controller compares a target grayscale within a dithering area to a predetermined reference grayscale and outputs image data using the reference grayscale and dithering maps when the target grayscale is below the reference. This controller also applies an offset grayscale to a first grayscale area, previously showing a black grayscale, and either the black or reference grayscale to a second area, previously showing the reference grayscale, in the current frame. The offset grayscale is set between the black and reference grayscales. The source driving circuit converts this image data into data signals, which the display panel then receives and uses to display the image.