Liquid Crystal Display Gray Scale Correction for Feed-Through Compensation
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Solution Overview
Problem
The existing methods for correcting gray scale data in liquid crystal display panels to compensate for the feed-through phenomenon result in a reduced gray scale range, leading to uneven display quality and a narrower reproduction range due to the in-plane distribution of voltage ΔVd across the panel.
Innovation Solution
A display device with a correction section that sets the correction amount to zero for gray scale data corresponding to lowest positive and negative polarity data signals at specific positions, ensuring that these data signals are not altered, thereby maintaining the original gray scale values and widening the usable gray scale range across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gray scale data is corrected to compensate for the feed-through phenomenon, then display quality is improved, but the gray scale range is reduced
Solution Approach 1:
The patent applies different correction amounts to different column positions on the display panel. Specifically, the correction amount varies depending on the position (first column, second column, third column, etc.), allowing localized compensation for the feed-through phenomenon while preserving the full gray scale range at each position. This resolves the contradiction by making the correction adaptive to position rather than uniform across the entire panel.
2Manufacturing precision
If correction amount is increased to compensate for voltage ΔVd distribution, then in-plane uniformity is improved, but the reproduction range is narrowed
Solution Approach 1:
The patent implements a dynamic correction approach where the correction amount is adjusted based on the specific column position and the corresponding voltage ΔVd distribution. Rather than applying a fixed correction amount, the system dynamically selects correction values from a set of predetermined correction amounts (first correction amount, second correction amount, third correction amount, etc.) matched to different column positions. This dynamic adaptation allows optimal compensation at each position while maintaining the full reproduction range.
3Manufacturing precision
If gray scale data is corrected across all columns, then feed-through phenomenon is compensated, but bit loss occurs
Solution Approach 1:
The patent applies correction amounts that are predetermined and optimized for each column position before the actual display operation. By pre-calculating and storing the appropriate correction amounts for each column (first correction amount for first column, second correction amount for second column, etc.), the system avoids the need for real-time calculations that could cause bit loss. The preliminary preparation of correction data ensures accurate compensation without information loss during runtime.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures a wider gray scale range and improved display quality by maintaining the original gray scale values for lowest positive and negative polarity data signals, reducing bit loss and providing uniform display quality across the panel.
Implementation Method 1
a liquid crystal capacitance Clc, and a storage capacitance Cs... The liquid crystal capacitance Clc is formed in a configuration in which a liquid crystal layer is provided between the picture element electrode 102 and a common electrode to which a voltage Vcom is applied
Implementation Method 2
The storage capacitance Cs is formed in a configuration in which a dielectric layer is provided between (i) a storage capacitance bus line to which a voltage Vcs is applied and (ii) the picture element electrode 102
Implementation Method 3
the picture PIX, in general, includes a parasitic capacitance such as a capacitance Cgd or the like formed between a picture element electrode 102 and the gate bus line GL
Data Source
AI summary
In at least one embodiment, a display device includes: a correction section for carrying out gray scale correction on gray scale data to be supplied to a display driver, by use of a correction amount corresponding to a position of each column to which the data signal is to be supplied, the each column being on a display panel, the correction section carrying out the gray scale correction by setting the correction amount to zero for at least (i) gray scale data corresponding to a lowest positive-polarity data signal potential and (ii) gray scale data corresponding to a lowest negative-polarity data signal potential of first gray scale data to be supplied to at least one column constituting a part of all columns, the gray scale data (i) and (ii) being among the gray scale data inputted into the correction section.