LCD Data Compensation Using Area-Specific Lookup Tables
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in displaying moving images due to the slower response speed of liquid crystals, which is not effectively addressed by existing technologies that require changes in liquid crystal material or panel structure.
Innovation Solution
A method of compensating image data by using a look-up table divided into areas defined by reference values to generate compensation data for the current frame based on grayscale data conditions, enhancing response speed without altering the liquid crystal material or panel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal material or panel structure is changed to increase response speed, then response speed is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the electrical parameters (voltage levels and timing) of the driving signal rather than modifying the physical liquid crystal material or panel structure. By adjusting the overdrive voltage and timing parameters in the data driving method, the response speed is improved while maintaining the existing panel structure, thus avoiding increased device complexity and manufacturing difficulty.
2Speed
If liquid crystal material or panel structure is changed to increase response speed, then response speed is improved, but manufacturing cost and difficulty increase
Solution Approach 1:
The invention modifies driving parameters (voltage levels, timing sequences) in the data driving method rather than changing physical materials or structures. This approach improves response speed while keeping manufacturing processes unchanged, thereby maintaining ease of manufacture and avoiding additional manufacturing costs.
3Speed
If grayscale data is compensated using fixed reference values, then response speed is improved, but display quality deteriorates due to boundary area defects
Solution Approach 1:
The patent segments the grayscale data compensation into multiple categories based on different gray level ranges (first gray level range, second gray level range, and boundary gray level range). By dividing the compensation strategy into distinct segments with different overdrive voltages and timing parameters, the method achieves both improved response speed and maintained display quality, avoiding the boundary area defects that occur with fixed reference values.
Solution Approach 2:
The invention applies different compensation parameters (voltage levels, timing) to different gray level regions and boundary areas. Specifically, it uses first compensation parameters for normal gray levels, second compensation parameters for boundary gray levels, and interpolation methods for transition regions. This localized quality approach ensures optimal response speed for each region while preventing display defects at boundaries.
Data Source
AI summary
A method of compensating data uses a look-up table divided into a first area, a second area and a boundary area between the first and second areas defined by a first previous reference value, a second previous reference value greater than the first previous reference value, a first current reference value and a second current reference value less than the first current reference value. A compensation data of a current frame is generated based on to which one of the first, second and boundary areas grayscale data of previous and current frames belongs.