LCD Pixel Overdrive for Sticky Response Artifacts
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Solution Overview
Problem
LCD panels exhibit slow pixel response times, particularly in the 'sticky' range of pixel values, leading to image smearing artifacts due to the viscous nature of liquid crystals, which existing overdrive methods fail to adequately address.
Innovation Solution
A method is introduced to provide a 'headstart' overdrive by calculating an output pixel value for a previous frame based on sticky pixel indicators, allowing the pixel to reach the target value within a single frame period by applying a pre-tilt LCD overdrive value during the current frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional overdrive methods are applied to accelerate pixel response, then pixel response time is reduced, but sticky pixels in specific value ranges still exhibit excessively slow response times causing smearing artifacts
Solution Approach 1:
The patent implements differentiated overdrive strategies based on the specific pixel value range. Standard overdrive is applied to most pixels, while enhanced overdrive is selectively applied only to sticky pixels identified in the problematic value range (approximately 50-150). This local quality approach ensures that resources are focused where needed most, resolving the response time inconsistency without unnecessarily increasing complexity system-wide.
Solution Approach 2:
The system performs preliminary identification of sticky pixels based on their current and target values before applying the overdrive command. By detecting which pixels fall within the sticky range and pre-calculating the enhanced overdrive values, the system prepares the corrected pixel values in advance, ensuring that even sluggish pixels begin their transition with the appropriate acceleration applied from the start of the frame period.
2Object-generated harmful factors
If pixel response time is reduced through overdrive, then smearing artifacts are minimized, but the complexity of the overdrive algorithm increases to handle sticky pixel identification and correction
Solution Approach 1:
The patent segments the pixel population into two distinct groups: standard pixels and sticky pixels. This segmentation is based on whether the pixel's current or target value falls within the identified sticky range. By dividing the problem this way, the algorithm can apply simple standard overdrive to most pixels while applying complex enhanced overdrive only to the subset of sticky pixels, thereby managing overall algorithmic complexity while effectively eliminating smearing artifacts.
Solution Approach 2:
The system changes the overdrive parameter values dynamically based on the pixel's current state. For sticky pixels, different overdrive amounts are applied compared to standard pixels, and the overdrive behavior changes depending on whether the current value or target value is in the sticky range. This parameter adaptation allows the system to handle complex sticky pixel behavior through relatively simple conditional logic rather than requiring a completely complex algorithm.
Data Source
AI summary
A memory efficient providing LC overdrive for sticky pixels at a frame n−1 for a current frame n based upon sticky pixel data associated with a frame n−2.