Liquid Crystal Display Common Electrode Pulse Control
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Solution Overview
Problem
Conventional liquid crystal display apparatuses face limitations in response speed, particularly in achieving fast fall responses and high-speed moving image displays due to constraints in materials and power consumption, with existing overdrive and reset systems leading to image degradation and temperature dependence issues.
Innovation Solution
The implementation of a liquid crystal display apparatus with a common electrode potential controlling circuit and storage capacitance electrode potential controlling circuit that change potentials into pulse shapes, allowing for a two-step overdrive effect without resetting the liquid crystal alignment, thereby increasing response speed and stability across temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional overdrive and reset systems are used to increase response speed, then response speed is improved, but image degradation and temperature dependence issues occur
Solution Approach 1:
The patent segments the common electrode potential control into multiple distinct phases: a first potential applied during scanning, a second potential applied after scanning completes, and a third potential applied before the next scanning cycle. This temporal segmentation allows each phase to serve a specific function - writing, stabilizing, and resetting - thereby achieving fast response without the image degradation associated with conventional reset systems that apply a single undifferentiated potential.
Solution Approach 2:
The patent applies the second potential to the common electrode immediately after scanning completes, before the liquid crystal molecules have fully responded to the written image data. This preliminary action stabilizes the liquid crystal alignment during the transition phase, preventing the overshoot and oscillation that causes image degradation in conventional systems. The third potential is then applied before the next scanning cycle to prepare the system for the next frame, ensuring consistent baseline conditions.
2Speed
If high voltage is applied to increase response speed, then response speed is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic application of different potentials to the common electrode in synchronization with the scanning cycle. The first potential is applied periodically during each scanning cycle to enable rapid voltage transitions and fast liquid crystal response. The second and third potentials are applied periodically between scanning cycles to stabilize and reset the system. This periodic modulation achieves high response speed while limiting overall power consumption by applying high voltage only during necessary time windows rather than continuously.
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 enhances response speed for both rise and fall responses, achieves stable images within one frame, reduces power consumption, and eliminates image degradation, enabling sharp moving image displays without blurring, while maintaining reliability and low production costs.
Implementation Method 1
When the conventional TN type liquid crystal display elements are subjected to simple matrix driving... a twisted nematic (TN) display system is used... made of a nematic liquid crystal composition
Implementation Method 2
The liquid crystal display elements having the TN type display system are made of a nematic liquid crystal composition
Implementation Method 3
the anisotropy of its dielectric constant... a change in the capacity of the liquid crystal layer remarkably increases due to the anisotropy of its dielectric constant
Data Source
AI summary
The liquid crystal display apparatus is provided with a display unit, a video signal driving circuit, a scanning signal driving circuit, a common electrode potential controlling circuit, and a synchronizing circuit. The display unit has a scanning electrode, a video signal electrode, a plurality of pixel electrodes arranged in matrix form, a plurality of switching elements which transmit video signals to the pixel electrodes, and a common electrode. After the scanning signal driving circuit scans the entire scanning electrodes and transmits video signals to the pixel electrodes, the common electrode potential controlling circuit changes the potential of the common electrode into a pulse shape, overdrives video signals, or increases a torque required to return to a state in which no voltage is applied.