Data Driver Phase Alternation for Display Crosstalk Reduction
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Solution Overview
Problem
Large-screen and ultra-high resolution liquid crystal displays face issues with flicker and image quality deterioration due to uneven charging of pixels, particularly with column inversion driving methods, which can result in crosstalk and streak unevenness, especially when displaying images with large white areas.
Innovation Solution
A display apparatus and data driver that alternate between two output modes: the first mode delays the phase of the negative polarity gradation data signal to reduce charging rate differences, and the second mode synchronizes the phases of positive and negative polarity gradation data signals to prevent crosstalk, thereby integrating states that cause and prevent crosstalk in a time direction to reduce visual crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If column inversion driving is used to reduce power consumption, then power consumption is reduced, but crosstalk and streak unevenness occur in displayed images
Solution Approach 1:
The patent applies periodic action by alternately executing first and second output modes in a cyclic manner. The data driver switches between delaying the phase of negative polarity gradation data signals (first mode) and synchronizing phases (second mode) periodically, which reduces visual crosstalk while maintaining power consumption benefits of column inversion driving
Solution Approach 2:
The patent changes the phase parameter of the negative polarity gradation data signal relative to the positive polarity signal. By dynamically adjusting the phase difference between polarity signals through alternating output modes, the system reduces crosstalk and streak unevenness while maintaining low power consumption operation
2Stability of the object's composition
If the phase of negative polarity gradation data signal is delayed to reduce charging rate differences, then charging uniformity is improved, but crosstalk occurs
Solution Approach 1:
The patent makes the phase relationship dynamic by alternating between two output modes. Instead of a fixed phase delay, the system dynamically switches between delaying the negative polarity signal (to improve charging uniformity) and synchronizing phases (to prevent crosstalk), creating a time-varying phase relationship that addresses both issues
Solution Approach 2:
The system periodically alternates between first output mode (with phase delay for charging uniformity) and second output mode (with phase synchronization to prevent crosstalk). This periodic switching allows the system to achieve both charging uniformity and crosstalk reduction over time
3Object-affected harmful factors
If positive and negative polarity gradation data signals are synchronized to prevent crosstalk, then crosstalk is reduced, but charging rate differences cause flicker
Solution Approach 1:
The patent makes the phase relationship dynamic rather than static. The system alternates between synchronized phases (to prevent crosstalk) and delayed negative polarity phases (to ensure charging uniformity), creating a dynamic phase relationship that addresses both crosstalk and flicker issues over time
Solution Approach 2:
The system periodically switches between second output mode (synchronized phases for crosstalk prevention) and first output mode (delayed phases for charging uniformity). This periodic alternation allows the system to achieve both crosstalk reduction and charging uniformity, eliminating flicker
Data Source
AI summary
In a first output mode, a signal in which a data pulse having a positive polarity voltage value appears in a predetermined cycle is output as a positive polarity gradation data signal, and a signal in which a data pulse having a negative polarity voltage value appears in the predetermined cycle with a phase different from the positive polarity gradation data signal is output as a negative polarity gradation data signal. In a second output mode, the above positive polarity gradation data signal is generated, and a signal in which a data pulse having a negative polarity voltage value appears in the predetermined cycle with the same phase as the positive polarity gradation data signal is output as the negative polarity gradation data signal. The first and second output modes are alternatively executed, and the output mode is switched within a predetermined period at intervals of the predetermined period.