Liquid Crystal Display Driving Method for Response Time
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Solution Overview
Problem
The existing driving methods for liquid crystal display (LCD) devices, particularly for patterned vertical alignment (PVA) type LCDs, are not effective in reducing liquid crystal response time due to fringe fields affecting the alignment of liquid crystal molecules far from the patterns, leading to slower response times.
Innovation Solution
A method that optimizes pixel signals by compensating pixel voltages based on predetermined conditions, applying pre-tilt voltages and overshooting patterns to improve the alignment of liquid crystal molecules, thereby reducing response time without altering the LCD panel structure or properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If overshooting driving method is applied to increase liquid crystal response time, then response time is reduced for conventional LCDs, but it is not fully effective for PVA type LCDs due to fringe fields affecting molecule alignment
Solution Approach 1:
The patent applies preliminary action by using the previous frame's pixel voltage to pre-align liquid crystal molecules before the current frame's voltage is applied. This pre-alignment prepares the molecules in advance, making them more responsive to the subsequent voltage change and overcoming the fringe field interference that plagues conventional overshooting methods in PVA LCDs.
Solution Approach 2:
The patent implements feedback by continuously using the pixel voltage from the previous frame (n-1)th frame as input for compensating the current frame (n)th frame's pixel voltage. This feedback mechanism allows the system to adapt to the actual state of liquid crystal molecules, ensuring that the compensation voltage effectively counteracts fringe field effects and achieves reliable alignment.
2Device complexity
If conventional driving methods are used for PVA type LCDs, then the LCD structure remains simple, but liquid crystal molecules far from fringe fields take longer to align due to initial misalignment
Solution Approach 1:
The patent applies preliminary action by using the previous frame's pixel voltage to pre-align liquid crystal molecules before the current frame's voltage is applied. This pre-alignment prepares the molecules in advance, making them more responsive to the subsequent voltage change and overcoming the fringe field interference that plagues conventional overshooting methods in PVA LCDs.
Solution Approach 2:
The patent changes the voltage parameter dynamically by compensating the current frame's pixel voltage based on the previous frame's voltage. This parameter change creates a compensated voltage that accounts for fringe field effects, enabling faster and more accurate molecule alignment without modifying the physical LCD structure.
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
This approach effectively reduces liquid crystal response time by ensuring faster alignment of molecules, enhancing display performance without changing the LCD structure or properties, and preventing image distortion caused by ripple patterns.
Implementation Method 1
When a target pixel voltage is applied to the pixel electrode, fringe fields are formed near the patterns and the liquid crystal molecules are laid toward expected directions by the fringe fields
Data Source
AI summary
A method of optimizing pixel signals for a liquid crystal display includes receiving the first, second and third pixel signals for the (n−1), (n) and (n+1)th frames. The first and second pixel signals are compared to determine if the second pixel signal requires overshooting or undershooting. The second and third pixel signals are compared to determine if the second pixel signal requires to be increased for pre-titling. The second pixel signal is compensated accordingly, thereby increasing liquid crystal response time.