Dynamic DCC Lookup Table Update for LCD Gray Level Control
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Solution Overview
Problem
In liquid crystal displays, the response speed of liquid crystal molecules is slow, making it difficult to precisely control gray levels when changing from low to high gray levels, especially when using dynamic capacitance compensation (DCC) without accurate modification of the DCC lookup table (LUT) data.
Innovation Solution
An image signal modifying device and method that generates a second DCC lookup table based on the adaptive color correction (ACC) lookup table, using an algorithm to adjust data values and store them in the second DCC lookup table, ensuring precise gray level control by incrementing or decrementing the target gray level until it matches the ACC lookup table values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dynamic capacitance compensation is applied without modifying the DCC LUT when ACC LUT changes, then the response speed improvement is maintained, but the gray level control precision deteriorates
Solution Approach 1:
The patent applies dynamics by making the DCC LUT dynamic rather than static. The DCC LUT is automatically updated/modified according to the changes in the ACC LUT, allowing the system to adapt to different operating conditions while maintaining both response speed and gray level control precision.
Solution Approach 2:
The patent changes parameters by modifying the DCC LUT data values based on the ACC LUT changes. When the ACC LUT is updated, the corresponding DCC LUT is recalculated and stored, ensuring that the compensation parameters remain accurate for the current operating conditions.
2Device complexity
If the DCC LUT is not updated when ACC LUT changes, then the device complexity is reduced, but the manufacturing precision of gray level control deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the updated DCC LUT data before actual image processing occurs. The LUT modification is performed in advance based on the ACC LUT changes, so that when image processing occurs, the correct compensation data is already ready, reducing real-time processing complexity.
Solution Approach 2:
The patent uses copying by creating a modified copy of the DCC LUT based on the ACC LUT changes. Instead of modifying the original DCC LUT in place, a new updated version is generated and stored, allowing for precise gray level control while maintaining the ability to revert or switch between different LUT configurations if needed.
Data Source
AI summary
An image signal modifying method is disclosed. In one aspect, the image signal modifying method includes inputting a gray level interval of a first dynamic capacitance compensation (DCC) lookup table to a current gray level which is a target in a previous image signal when it is overdriven (DTG) and 0 to a gray level of the previous image signal (PIG). The method also includes searching for a data value in an adaptive color correction (ACC) lookup table corresponding to a gray level equal to a numerical value of the DTG (ALT) and performing an algorithm based on the DTG, the ALT, and the gray level interval of the first DCC lookup table. The method further includes generating a second DCC lookup table based on the algorithm, and performing second DCC processing on the input image signal based on the second DCC lookup table.