Display Control Circuit Horizontal Crosstalk Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In conventional LCD panels, significant changes in data voltages from the source driver can cause voltage shifts in the common electrode, leading to horizontal crosstalk, where pixels fail to display expected gray levels, resulting in brighter or darker lines than intended.
Innovation Solution
A data compensation method is introduced, where subpixel data for a first horizontal line is converted into digital values related to driving voltages, and a compensation value is calculated based on the difference between accumulated values of adjacent horizontal lines, to generate output subpixel data that compensates for voltage shifts and eliminates horizontal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If data voltages are changed significantly to improve display contrast and brightness range, then display dynamic range is improved, but horizontal crosstalk occurs due to common electrode voltage shift
Solution Approach 1:
The patent applies preliminary action by calculating and applying compensation values to subpixel data before the actual display rendering. The compensation value is computed based on the accumulated difference of data voltages in the current horizontal line compared to the previous line, and this compensation is applied in advance to prevent the horizontal crosstalk from occurring during display.
Solution Approach 2:
The patent changes the parameter of subpixel data by adding a compensation value to the original input subpixel data. This parameter change adjusts the voltage level applied to each subpixel, compensating for the common electrode voltage shift caused by significant data voltage changes, thereby eliminating horizontal crosstalk while maintaining the desired brightness range.
2Illumination intensity
If data voltages are changed significantly to improve display contrast, then image dynamic range is improved, but gray level accuracy deteriorates due to common electrode voltage shift
Solution Approach 1:
The compensation value is calculated and applied in advance before the actual display rendering. By computing the accumulated voltage difference between horizontal lines and applying this compensation beforehand, the system prevents gray level inaccuracies from occurring during the display process, thereby maintaining both contrast and gray level accuracy.
Solution Approach 2:
The subpixel data parameter is modified by adding a compensation value that counteracts the common electrode voltage shift. This parameter change ensures that the intended gray levels are accurately displayed even when significant voltage changes are applied for contrast enhancement.
3Object-affected harmful factors
If compensation values are calculated and applied to subpixel data, then horizontal crosstalk is reduced, but processing complexity increases
Solution Approach 1:
The patent segments the processing by handling each horizontal line independently, calculating the accumulated voltage difference for each line separately. This segmentation allows for a systematic and modular approach to compensation, where each line is processed in sequence, making the overall complex process more manageable and implementable.
Solution Approach 2:
The patent employs feedback by using the accumulated voltage difference information from previous horizontal lines to calculate compensation values for the current line. This feedback mechanism allows the system to dynamically adjust the subpixel data based on actual voltage shifts, effectively reducing horizontal crosstalk through a systematic feedback-based compensation approach.
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
The method effectively reduces horizontal crosstalk by accurately adjusting subpixel data to maintain intended gray levels, thereby improving the display's image quality and consistency.
Implementation Method 1
there are coupling capacitance between data lines on a lower substrate of the LCD panel and a common electrode on an upper substrate of the LCD panel
Data Source
AI summary
A data compensation method include following steps. Input subpixel data corresponding to subpixels of a first horizontal line of a display panel are converted respectively into digital values. A first accumulated value is generated by accumulating the digital values converted from the input subpixel data corresponding to the first horizontal line. A difference value is calculated between the first accumulated value corresponding to the first horizontal line and a second accumulated value corresponding to a second horizontal line. A first compensation value with respect to a first subpixel of the first horizontal line is obtained according to a first input subpixel data, the difference value and a first voltage polarity for driving the first subpixel. A first output subpixel data to be displayed by the first subpixel is generated according to the first input subpixel data and the first compensation value.