LCD Driving Device Subpixel Gray Scale Compensation
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Solution Overview
Problem
Super-patterned vertical alignment (S-PVA) type liquid crystal displays face deterioration in response speed and image quality due to the inability to apply optimized compensated gray scale values to subpixels, resulting from the dynamic capacitance compensation method.
Innovation Solution
An LCD driving device is developed with a memory, memory controller, converters, compensators, and an output part that independently compensates sub-image data for subpixels by converting and optimizing image data into different gray scale values for each subpixel, ensuring optimized compensated image data is applied to both subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dynamic capacitance compensation (DCC) is applied to enhance response speed, then response speed is improved, but the inability to apply optimized compensated gray scale values to subpixels causes deterioration of response speed and image quality
Solution Approach 1:
The patent divides the image data processing into separate paths for first subimage data and second subimage data corresponding to different subpixels. Each subimage data undergoes independent compensation processing, allowing optimized gray scale values to be applied to each subpixel individually, thereby resolving the contradiction between response speed and image quality.
Solution Approach 2:
The patent applies different compensation strategies to different subpixels based on their specific characteristics. By generating different compensated gray scale values for first and second subimage data, the system optimizes the gray scale values locally for each subpixel, improving both response speed and image quality simultaneously.
2Manufacturing precision
If compensated gray scale value is generated as a function of target gray scale value and previous frame gray scale value, then image quality is improved, but the S-PVA type LCD cannot apply optimized compensated gray scale values to subpixels resulting in deterioration of response speed
Solution Approach 1:
The patent segments the compensation process into independent operations for each subpixel. The first compensator processes first subimage data using third subimage data, while the second compensator processes second subimage data using fourth subimage data. This segmentation allows each subpixel to receive optimized compensation tailored to its specific requirements, resolving the contradiction between image quality improvement and response speed maintenance.
Solution Approach 2:
The patent implements dynamic compensation by using both current frame subimage data and previous frame subimage data in the compensation process. The compensators dynamically adjust the gray scale values based on the difference between frames, allowing the system to maintain high image quality while responding quickly to changes in the displayed image.
Data Source
AI summary
In a driving device for an LCD that enables accurate compensation of sub image data, a memory sequentially stores an image data in a frame unit. A memory controller reads out a previous image data corresponding to a previous frame from the memory, stores a present image data corresponding to a present frame in the memory and outputs the previous image data and the present image data. A first converter converts the present image data into a first sub image data and a second sub image data, and a second converter converts the previous image data output into a third sub image data and a fourth sub image data. A first compensator compensates the first sub image data using the third sub image data, and a second compensator compensates the second sub image data using the fourth sub image data.