Hold-Type Display Device Frame Delay for Edge Coloring
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Solution Overview
Problem
Hold-type displays suffer from moving image blur and edge area coloring issues due to differences in moving image blur offset and blur times for red, green, and blue colors, leading to incongruence in image display when scrolling, especially in liquid crystal displays.
Innovation Solution
A hold-type display device with a frame memory and arithmetic circuit that delays video data of specified colors by one frame period, ensuring edge areas are displayed with improved saturation within the same color group, reducing conspicuous edge coloring and moving image blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hold-type display is used to maintain brightness, then still image quality is improved, but moving image blur occurs at edges
Solution Approach 1:
The patent segments the video signal processing into multiple channels (R, G, B) and applies different delay treatments to each channel based on their individual brightness characteristics. This allows independent optimization of each color component to resolve the edge blur issue while maintaining overall brightness stability.
Solution Approach 2:
The patent applies local quality by treating different color channels differently based on their specific brightness response characteristics. Each channel (R, G, B) receives customized delay compensation based on its individual properties, rather than applying a uniform treatment to all channels.
2Manufacturing precision
If black insertion driving is used to reduce moving image blur, then edge coloring is suppressed, but brightness is reduced
Solution Approach 1:
The patent applies preliminary action by delaying the video signal for specific color channels before the actual display update. This pre-delay compensates for the brightness hold characteristic of hold-type displays, allowing the edge coloring issue to be addressed without inserting black frames that would reduce brightness.
Solution Approach 2:
The patent changes the timing parameter of the video signal by introducing variable delays (Ta, Tb, Tc) for different color channels. This parameter adjustment allows the system to maintain brightness while suppressing edge coloring, avoiding the need for black insertion driving.
3Manufacturing precision
If different frame frequencies are used for different colors, then edge coloring is reduced, but display complexity increases
Solution Approach 1:
The patent segments the video signal into separate R, G, and B channels, allowing independent delay processing for each channel. This segmentation enables different frame frequencies to be applied to different colors without requiring complete redesign of the entire display system, thus managing complexity while achieving edge color consistency.
Solution Approach 2:
The patent introduces dynamic delay adjustment based on the brightness changes detected in each color channel. The delay amounts (Ta, Tb, Tc) are not fixed but vary according to the actual video content and brightness characteristics, allowing flexible adaptation without requiring complex hardware redesign.
Data Source
AI summary
A hold-type display device reduces the blur of a moving image and makes less conspicuous the color shift caused due to different blur positions among RGB. In the case where the relative brightness of the video data of one or two of the three primary colors RGB changes from between 0 and 0.5 inclusive for the previous frame to between 0 and 0.5 inclusive for the present frame, the video image of the one or two colors is delayed by one frame and displayed.