Liquid Crystal Display Driving Apparatus Crosstalk Control
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Solution Overview
Problem
Liquid crystal displays suffer from display quality deterioration due to crosstalk, such as vertical lines and non-uniform color generation, caused by the overlap of gray levels, which can be exacerbated by increasing the duration of the gate-on signal to prevent these issues.
Innovation Solution
A driving apparatus and method for a liquid crystal display that includes a signal modification unit which compares input data signals with stored signals to determine if quality deterioration is occurring, and adjusts the duration of the gate-on signal accordingly, outputting different control signals to manage the gate-on time based on this determination, thereby preventing the increase in gate-on signal duration that leads to crosstalk and non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the duration of the gate-on signal is increased to increase the charging time of the liquid crystal layer, then the crosstalk is reduced, but the gray levels overlap and colors become non-uniform
Solution Approach 1:
The patent applies dynamics by making the gate-on signal duration variable rather than fixed. The driving apparatus dynamically adjusts the gate-on signal duration based on the data signal characteristics: when crosstalk is detected (first data signal condition), a longer gate-on duration is applied; when crosstalk is not present (second data signal condition), a shorter gate-on duration is used. This dynamic adjustment resolves the contradiction by adapting the charging time to actual display needs.
Solution Approach 2:
The patent changes the temporal parameter (duration) of the gate-on signal based on detected conditions. By monitoring data signal patterns and adjusting the gate-on signal duration parameter accordingly, the system optimizes charging time to prevent crosstalk while avoiding gray level overlap and color non-uniformity.
2Object-affected harmful factors
If the duration of the gate-on signal is increased to prevent crosstalk, then vertical lines are reduced, but color uniformity deteriorates
Solution Approach 1:
The patent applies local quality by treating different data signal conditions differently. Instead of applying a uniform gate-on signal duration to all pixels, the system locally adjusts the duration based on specific conditions: longer duration is applied only when crosstalk is detected in particular data signals, while normal duration is maintained for other signals. This localized adjustment prevents crosstalk where needed without affecting color uniformity elsewhere.
Solution Approach 2:
The system changes the gate-on signal duration parameter conditionally based on data signal analysis. When specific patterns indicating crosstalk are detected, the duration parameter is increased locally; otherwise, the parameter remains at its standard value, preserving color uniformity across the display.
Data Source
AI summary
A driving apparatus of a liquid crystal display includes a signal modification unit which modifies a signal based on a data signal input to the liquid crystal display, where the signal modification unit determines whether the data signal corresponds to an image to be displayed with a quality deterioration and outputs at least one of a first signal and a second signal, where the first signal is output when the signal modification unit determines the data signal corresponds to the image to be displayed with the quality deterioration, and where the second signal is output when the signal modification unit determines the data signal does not corresponds to the image to be displayed with the quality deterioration.