LCD Common Voltage Driving with Periodic Pulses to Remove Audible Noise
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Solution Overview
Problem
Conventional liquid crystal display apparatuses face challenges in reducing audible noise without increasing frame frequency or reducing storage capacitor charging time, which can lead to incomplete data signal charging and compromised picture quality.
Innovation Solution
A liquid crystal display apparatus employing a line reversal method with specific voltage level and pulse patterns in charging and intermediate periods for the common voltage, ensuring efficient data signal charging and reducing audible noise frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frame frequency is increased to remove audible noise, then audible noise is reduced, but power consumption increases and picture quality may deteriorate
Solution Approach 1:
The patent applies periodic pulse voltages to the common voltage electrode during intermediate periods between charging periods. This periodic action disperses the common voltage frequency to beyond the audible range, effectively removing audible noise without requiring an increase in frame frequency, thereby avoiding increased power consumption and picture quality deterioration.
2Object-affected harmful factors
If frame frequency is increased to remove audible noise, then audible noise is reduced, but picture quality may deteriorate
Solution Approach 1:
The patent applies periodic pulse voltages to the common voltage electrode during intermediate periods between charging periods. This periodic action disperses the common voltage frequency to beyond the audible range, effectively removing audible noise without requiring an increase in frame frequency, thereby avoiding picture quality deterioration.
3Object-affected harmful factors
If charging time is reduced to increase frame frequency, then audible noise is reduced, but data signal charging becomes incomplete
Solution Approach 1:
The patent applies periodic pulse voltages to the common voltage electrode during intermediate periods between charging periods. This periodic action disperses the common voltage frequency to beyond the audible range, effectively removing audible noise without requiring a reduction in charging time, thereby maintaining complete data signal charging.
Data Source
AI summary
Present embodiments may include a liquid crystal display apparatus, using a line reversal method, wherein at least one pulse is inserted between charging periods, and a method of driving the liquid crystal display apparatus. According to present embodiments, in a liquid crystal display apparatus employing a polarity reversal method, audible noise may be removed without increasing a frame frequency and reducing a charging time of a storage capacitor.