Row Buffer Response Time Compensation for LCD Blurring
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Solution Overview
Problem
Liquid Crystal Display (LCD) devices suffer from blurring and color shift due to the inherent delay in the response time of LC elements, which is exacerbated by the need for large memory buffers in conventional Response Time Compensation methods, leading to potential loss of detail and quality when compressing data.
Innovation Solution
A Feed Forward Driving (FFD) module with a Look-Up Table (LUT) is used to generate overdrive signals by comparing sub-pixel values between previous and current frames, allowing for efficient response time compensation without the need for large memory buffers by using a row buffer instead of a frame buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frame buffer with sufficient memory capacity is used to store sub-pixel voltage values for the entire previous frame, then response time compensation can be achieved, but memory requirements become very large (approximately 6 MB for 1080x1920 resolution)
Solution Approach 1:
The patent divides the frame buffer into multiple row buffers, where each row buffer stores voltage values for only one row of pixels from the previous frame. This segmentation reduces the memory capacity from storing all 1080x1920 pixels to storing only 1920 pixels per row, significantly decreasing the required memory while still enabling response time compensation through the FFD method
Solution Approach 2:
The patent transitions from storing two-dimensional frame data (width x height) to storing one-dimensional row data (width only). By changing the dimensionality of stored data from the entire frame to individual rows, the system achieves response time compensation with much smaller memory requirements, as each row buffer needs to store only the voltage values for its corresponding row
2Quantity of substance
If compression techniques are used to reduce memory size down to about 600 KB, then memory requirements are reduced, but loss of detail and quality occurs at varying degrees
Solution Approach 1:
By segmenting the frame buffer into multiple row buffers that store only the necessary previous frame row data, the patent achieves effective memory reduction without compression. Each row buffer stores complete voltage value information for its row, preserving full image quality and detail while reducing total memory requirements from 6 MB to approximately 600 KB through the row-based storage architecture
3Productivity
If the response time of LC elements is longer than the refresh cycle, then the LCD can be driven at higher frequencies, but blurring and color shift effects occur in displayed images
Solution Approach 1:
The patent applies preliminary action by using the Feed Forward Driving method to pre-compensate for the LC element response delay. The FFD module calculates the voltage difference between the current frame and the previous frame (stored in row buffers), and applies an overdrive voltage to accelerate the LC molecule reorientation. This preliminary compensation ensures that the pixels reach their target state within the refresh cycle, preventing blurring and color shift effects even at high display frequencies
Data Source
AI summary
Some demonstrative embodiments of the invention include a method device and/or system of displaying an image on a display having an array of sub-pixel elements. The method may include, for example, obtaining a first set of one or more values by sampling values of one or more sub-pixel value-holders associated with one or more of said sub-pixel elements, the first set of values corresponding to one or more sub-pixels of a first frame of said image; receiving a second set of values corresponding to one or more sub-pixels of a second frame of said image; and updating the values of one or more of the sub-pixel value-holders based on the first and second sets of values. Other embodiments are described and claimed.