Flat Panel Display Crosstalk Reduction Using Selective Gradation
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Solution Overview
Problem
Flat panel displays experience unwanted horizontal line crosstalk due to parasitic capacitance between scan and data lines, which worsens with increasing resolution and frame frequencies, causing image distortion and sharpness loss.
Innovation Solution
A method to reduce line crosstalk by softening image pattern boundaries through an algorithm that introduces gradation only where abrupt voltage changes occur, maintaining image sharpness by modifying grayscale values of specific pixels based on calculated grayscale deltas and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If softening is applied to entire boundaries throughout the image pattern, then line crosstalk is reduced, but image sharpness is reduced
Solution Approach 1:
The patent applies softening selectively only to specific boundaries where line crosstalk occurs, rather than uniformly to all boundaries. The system identifies boundaries with abrupt voltage changes and applies gradation only to those locations, preserving sharpness in areas without crosstalk issues while reducing artifacts locally where needed.
Solution Approach 2:
The patent divides the image boundary softening process into discrete segments based on voltage change detection. Each boundary is evaluated independently, and softening is applied segment-by-segment only where the grayscale delta exceeds a threshold, rather than applying a global softening filter to the entire image.
2Measurement precision
If display resolution and operating frame frequencies are increased, then display quality is improved, but line crosstalk becomes more apparent
Solution Approach 1:
The patent dynamically adjusts the grayscale values at specific pixel locations based on detected voltage changes and crosstalk conditions. By modifying the grayscale parameter locally at boundaries with abrupt changes, the system compensates for the increased susceptibility to crosstalk that arises from higher resolution and frame frequency operation.
3Object-affected harmful factors
If gradation is introduced for all image portions, then line crosstalk is reduced, but artifacts increase
Solution Approach 1:
The patent applies gradation only to specific portions of the image where line crosstalk is detected, rather than uniformly across the entire image. By identifying boundaries with abrupt voltage changes and applying softening only to those locations, the system reduces crosstalk while minimizing the introduction of artifacts in areas where gradation is not needed.
Solution Approach 2:
The patent applies a partial softening action only to the extent necessary to reduce line crosstalk at specific boundaries, rather than applying excessive softening across the entire image. The gradation is applied selectively based on threshold criteria, providing just enough softening to mitigate crosstalk without over-softening that would create visible artifacts.
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
Effectively reduces line crosstalk while preserving image sharpness by applying gradation only to pixels that cause observable crosstalk, minimizing artifacts and enhancing display quality.
Implementation Method 1
Line crosstalk typically occurs because of parasitic capacitance between horizontal scan or power supply lines and vertical data lines in the display
Data Source
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AI summary
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for displaying an image on a flat panel display with an array of pixels. A method includes receiving image data including a grayscale value for each pixel; determining a grayscale delta for each pixel where the grayscale delta is a variation between the grayscale value for a given pixel addressable by a first scan line and the grayscale value for another pixel addressable by a scan line addressed prior to the first scan line; determining an aggregated grayscale delta for the first scan line; comparing a magnitude of the aggregated grayscale delta to a threshold value corresponding to a data signal that results in line crosstalk; modifying the image data when the magnitude of the aggregated grayscale delta equals or exceeds the threshold value, and displaying the image on the flat panel display using the modified image data.