Display Overdriving Controller Using Horizontal Line Pixel Comparison
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Solution Overview
Problem
Existing display devices face challenges in accurately compensating for pixel brightness delays, particularly in still images, due to parasitic capacitance and material delays, which affect image quality and require costly separate lookup tables for each sub-pixel color.
Innovation Solution
A display driving device and method that compares pixel data between previous and current sub-pixels in units of horizontal lines to determine overdriving compensation, using a lookup table to adjust compensation values based on color arrangement patterns and difference values, allowing for accurate compensation without increasing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate lookup tables are used for each color of each sub-pixel, then compensation accuracy is improved, but manufacturing costs and device size increase
Solution Approach 1:
The patent implements a single lookup table that serves all sub-pixels of different colors (red, green, blue) by using color arrangement pattern information to selectively determine compensation values. This universal approach eliminates the need for separate lookup tables for each color, reducing memory usage and manufacturing costs while maintaining accurate compensation for each sub-pixel type through pattern-based selection.
Solution Approach 2:
The patent applies local quality by using color arrangement pattern information to selectively apply different compensation values from the same lookup table to different sub-pixel colors. The compensation value determination is localized to each sub-pixel's specific color and position context, ensuring accurate compensation without requiring separate global lookup tables for each color.
2Loss of time
If general overdriving compensation method is used, then video image delay is reduced, but still image compensation is not applicable
Solution Approach 1:
The patent implements a dynamic compensation approach that adapts to different image types (video or still images) by comparing pixel data within the same image. The system dynamically determines compensation values based on the difference between previous and current sub-pixel data, making the overdriving method universally applicable to both video sequences and single still images without requiring separate processing paths.
Solution Approach 2:
The patent performs preliminary comparison of pixel data between previous and current sub-pixels to determine compensation needs before applying the overdriving compensation. This preliminary action enables the system to identify which sub-pixels require compensation and calculate appropriate compensation values in advance, effectively reducing delay for both video and still images.
3Ease of manufacture
If one common lookup table is used, then manufacturing costs are reduced, but accurate compensation for specific color sub-pixels cannot be performed
Solution Approach 1:
The patent applies local quality by using color arrangement pattern information to selectively apply different compensation values from the same lookup table to different sub-pixel colors. The compensation value determination is localized to each sub-pixel's specific color and position context, ensuring accurate compensation without requiring separate global lookup tables for each color.
Solution Approach 2:
The patent introduces color arrangement pattern information as an intermediary that mediates between the common lookup table and the specific color sub-pixels. This intermediary enables the system to select appropriate compensation values from the unified lookup table based on the color and position of each sub-pixel, maintaining both manufacturing simplicity and compensation accuracy.
Data Source
AI summary
A display driving device capable of performing overdriving compensation for image data using a comparison result between pixel data of a previous sub-pixel and pixel data of a current sub-pixel in units of horizontal lines includes overdriving controller configured to generate overdriving pixel data for a current sub-pixel based on a result of comparison between first pixel data for a previous sub-pixel and second pixel data for the current sub-pixel and a color arrangement pattern of the previous sub-pixel and the current sub-pixel in units of horizontal lines of image data, and a data driver configured to generate a source signal for the current sub-pixel based on one of the second pixel data and the overdriving pixel data to supply the source signal to the current sub-pixel.