Response Time Compensation for LCD Gray Level Transitions
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Solution Overview
Problem
Active-matrix liquid crystal display (LCD) technologies face challenges in achieving fast response times between gray levels, leading to blurry images during video playback due to inadequate response times, especially when transitioning from black pixels.
Innovation Solution
The implementation of a response time compensation (RTC) module that provides boosted gray level values when transitioning from a previous gray level of zero to a current gray level, and from a previous gray level greater than zero, using look-up tables (LUTs) to determine appropriate gray level surrogates for improved luminance response within a single frame period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If response time compensation is applied to improve transition speed, then response time is improved, but image quality deteriorates due to blurry transitions from black pixels
Solution Approach 1:
The patent applies different RTC strategies for different gray level transitions: transitions from gray level zero use one compensation approach, while transitions from gray levels greater than zero use another approach. This local differentiation resolves the contradiction by optimizing each transition type separately rather than applying a uniform solution.
Solution Approach 2:
The patent modifies the gray level parameters used in RTC calculations based on the previous gray level value. By changing the compensation parameters dynamically according to the transition context, the system achieves both fast response times and acceptable image quality across different transition scenarios.
2Speed
If gray level transitions are accelerated to meet video requirements, then response time is improved, but transition smoothness deteriorates causing blur
Solution Approach 1:
The patent implements dynamic RTC adjustment where the compensation strength and method vary based on the previous gray level. Transitions from zero use a different dynamic profile than transitions from non-zero levels, allowing the system to adapt transition characteristics to maintain smoothness while achieving required speed.
Solution Approach 2:
The patent applies preliminary compensation adjustments before the actual gray level transition occurs. By pre-calculating and applying appropriate compensation values based on the current and previous gray levels, the system prepares the pixel state to transition smoothly and quickly to the target state.
3Device complexity
If uniform RTC is applied to all gray level transitions, then implementation simplicity is maintained, but overall average response time deteriorates
Solution Approach 1:
The patent segments the RTC implementation into two distinct modules: one for transitions from gray level zero and another for transitions from gray levels greater than zero. This segmentation allows each module to be optimized independently for its specific transition type, improving overall average response time while maintaining manageable complexity through modular design.
Data Source
AI summary
An apparatus and method for performing response time compensation. The apparatus described includes a first response time compensation (RTC) module for providing boosted gray level values when transitioning only from a previous gray level of zero to a first current gray level for a color of a pixel of a display. The apparatus also includes a second RTC module for providing boosted gray level values when transitioning from a previous gray level greater than zero to a current gray level for the color of the pixel.