LOD Table Adjustment for LCD Pixel Charging
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Solution Overview
Problem
Current LCD display panels face challenges in achieving optimal image charging due to the longer response time of liquid crystals and shorter charging time, leading to significant differences in charging solid and pure grayscale images, which affect display quality.
Innovation Solution
A line over driving (LOD) table adjustment method that divides the display panel into blocks, calculates initial grayscale values, adjusts them based on gamma correction and measured brightness values, and iteratively refines the grayscale values to ensure target brightness is within a default error range, improving pixel charging rates and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid crystal response time is increased to improve image quality, then display quality improves, but pixel charging rate decreases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing over-driving grayscale values in an LOD table before actual image display. The system predicts the required over-driving values based on previous frame grayscale data and stores them in advance, allowing the display to compensate for liquid crystal response delays without waiting for real-time calculation during display operations.
Solution Approach 2:
The patent changes the grayscale parameter dynamically by adjusting the over-driving grayscale values stored in the LOD table. When a pixel needs to transition between grayscale levels, the system retrieves the appropriate over-driving value from the LOD table and applies it to accelerate the liquid crystal response, effectively changing the parameter to compensate for response time limitations.
2Productivity
If LOD table adjustment is implemented to improve pixel charging rate, then pixel charging rate improves, but device complexity increases
Solution Approach 1:
The patent segments the display panel into multiple blocks and creates separate LOD tables for different block types (P-blocks and NP-blocks). This segmentation allows the system to apply different over-driving strategies to different regions, improving pixel charging rates while managing complexity by organizing the adjustment process into manageable segments rather than treating the entire display uniformly.
Solution Approach 2:
The patent introduces an intermediary LOD table that acts as a buffer between the input image data and the display output. The LOD table stores pre-calculated over-driving values that mediate the transition from standard grayscale data to adjusted display values, simplifying the overall system architecture by centralizing the complexity in a dedicated lookup table rather than requiring complex real-time calculation circuits.
3Productivity
If grayscale values are adjusted for over driving pixels, then pixel charging rate improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies partial action by adjusting only specific pixels that require over-driving based on their previous and current grayscale values. Instead of uniformly adjusting all pixels, the system selectively applies over-driving only where needed (when grayscale transitions require acceleration), thereby improving pixel charging rates for critical pixels while maintaining standard precision for other pixels, reducing overall manufacturing precision requirements.
Data Source
AI summary
The present invention provides a line over driving (LOD) table adjustment method and a system thereof, which divides a display panel into M*N blocks. In an i-th row and a j-th column in the LOD table corresponding to a block, according to a brightness value of a grayscale value of a pixel of a previous line and a current line corresponding to an initial grayscale value of over driving pixels, calculate a target brightness value of an adjustment screen corresponding to a combination of the grayscale value of the pixel of the previous line and the current line corresponding to the initial grayscale value of over driving pixels, and obtain a measured brightness value of the adjustment screen to compare whether the difference between the target brightness value and the measured brightness value is within the default error range value to determine a final grayscale value of over driving pixel.