LCD Storage Electrode Driving for Faster Pixel Voltage Response
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face challenges in displaying moving images due to the slow response speed of liquid crystal molecules, which requires a significant amount of time to reach the target voltage, especially when the difference between the target and previous voltages is large, and this issue is exacerbated by the need for a frame memory in dynamic capacitance compensation methods.
Innovation Solution
The implementation of a liquid crystal display with a storage electrode system that includes gate lines, data lines, switching elements, storage electrodes, and a storage electrode driver, which generates storage electrode signals that change levels based on gate-on and gate-off voltages, allowing the pixel voltage to be adjusted without a frame memory, thereby improving the response speed of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a higher voltage is applied to the LC capacitor to shorten the time for reaching the target voltage, then the response speed of LC molecules is improved, but the manufacturing cost increases due to the need for a frame memory
Solution Approach 1:
The patent extracts the frame memory component from the system by implementing a dual-storage-capacitor architecture where the storage capacitor and LC capacitor work together to achieve voltage compensation without requiring external frame memory, thereby reducing device complexity while maintaining improved response speed
Solution Approach 2:
The storage capacitor serves multiple functions: it stores compensation voltage, works with the LC capacitor to achieve dynamic capacitance compensation, and eliminates the need for frame memory, thereby reducing device complexity while maintaining improved response speed
2Speed
If a higher voltage is applied to the LC capacitor to shorten the time for reaching the target voltage, then the response speed of LC molecules is improved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the frame memory component from the system architecture, replacing it with an integrated dual-capacitor approach that reduces manufacturing complexity and cost while achieving the same response speed improvement
Solution Approach 2:
The patent uses simple capacitor structures that can be easily manufactured using standard LCD fabrication processes, replacing the need for expensive frame memory components, thereby reducing manufacturing cost while maintaining improved response speed
3Speed
If the voltage charged in the LC capacitor is increased to reach the target voltage faster, then the response speed is improved, but the time required varies significantly based on the previous charged voltage
Solution Approach 1:
The patent implements feedback through the storage capacitor that compensates for voltage variations based on previous charged states, ensuring consistent response time regardless of the starting voltage, thereby maintaining stable and predictable performance
Solution Approach 2:
The patent dynamically adjusts the effective capacitance by varying the voltage distribution between the storage capacitor and LC capacitor, allowing the system to maintain optimal response speed across different operating conditions and previous voltage states
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 solution enhances the response speed of liquid crystal molecules without the need for a frame memory, allowing for faster voltage stabilization and improved display of moving images, while reducing manufacturing costs.
Implementation Method 1
applying voltages to the field-generating electrodes to generate an electric field in the LC layer, which determines orientations of LC molecules in the LC layer to adjust polarization of incident light
Implementation Method 2
adjust polarization of incident light
Implementation Method 3
each pixel includes a switching element, a liquid crystal capacitor, and a storage capacitor connected in parallel to the liquid crystal capacitor
Data Source
AI summary
A liquid crystal display (“LCD”) includes a plurality of gate lines, a plurality of data lines intersecting the gate lines, a plurality of switching elements connected to the gate lines and the data lines, a plurality of storage electrodes, a plurality of storage electrode lines connected to the storage electrodes, a plurality of pixel electrodes connected to the switching elements and overlapping the storage electrodes, a gate driver generating gate signals having a gate-on voltage and a gate-off voltage to apply to the gate lines, a data driver generating data voltages corresponding to externally applied image signals to apply to the data lines, and a storage electrode driver generating storage electrode signals having a reference voltage, a high voltage larger than the reference voltage, and a low voltage smaller than the reference voltage to apply to the storage electrode lines. Each storage electrode signal changes a level thereof when the gate-on voltage is applied to the gate lines and changes a level thereof when a predetermined time elapses after the gate-off voltage is applied to the gate lines.