Pixel Structure Control Electrode for Fast Response and Low Leakage
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Solution Overview
Problem
Conventional LCD pixel structures face issues such as slow response times, light leakage during the dark state, increased production complexity, and stringent fabrication requirements due to the need for additional process steps and precise alignment in multi-domain and patterned vertical alignment modes, as well as high production costs and power consumption in existing driving methods.
Innovation Solution
A pixel structure with a control electrode formed on the lower substrate, coupled with switch devices and a coupling electrode, allows for stable voltage driving by maintaining an absolute voltage difference greater between the control electrode and the common electrode compared to the pixel electrode, enabling efficient liquid crystal molecule tilting and improved display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If protrusions are added on the upper substrate to create pre-tilt angle for faster response, then response speed is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The invention extracts the pre-tilt function from the upper substrate protrusions and relocates it to the lower substrate through a control electrode. This removes the need for complex upper substrate modifications while achieving the same molecular tilting effect, thereby reducing device complexity while maintaining fast response speed.
Solution Approach 2:
The invention changes the spatial arrangement by moving the pre-tilt control mechanism from the upper substrate to the lower substrate. This dimensional repositioning allows the control electrode to generate the necessary electric field for pre-tilt without requiring physical protrusions, simplifying the overall device structure.
2Speed
If protrusions are added on the upper substrate to create pre-tilt angle, then response speed is improved, but light leakage occurs during dark state
Solution Approach 1:
The invention removes the protrusion structure from the upper substrate that causes light leakage while extracting its pre-tilt function and implementing it through the control electrode on the lower substrate. This eliminates the harmful light leakage effect while preserving the beneficial fast response characteristic.
3Speed
If additional process steps are performed to create protrusions or patterned slits, then response performance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention extracts the pre-tilt functionality from complex fabrication processes (protrusion creation or patterned slit formation) and implements it through a standard control electrode deposition process on the lower substrate. This eliminates additional manufacturing steps while achieving the same response performance improvement.
4Manufacturing precision
If precise alignment between upper and lower substrates is performed, then electrical field distribution is optimized, but device complexity and manufacturing complexity increase
Solution Approach 1:
The invention removes the requirement for precise inter-substrate alignment by relocating the pre-tilt control mechanism to the lower substrate. The control electrode can generate the necessary electric field without requiring precise alignment with the upper substrate, thereby reducing manufacturing complexity while maintaining optimal electrical field distribution.
5Reliability
If additional integrated circuits are added to drive control electrode with synchronized voltage, then display performance is improved, but device complexity and production cost increase
Solution Approach 1:
The invention makes the control electrode serve multiple functions: it provides both the pre-tilt angle during the off-state and the driving voltage during the on-state. This multi-functionality eliminates the need for separate additional integrated circuits, reducing device complexity and production cost while maintaining reliable display performance.
6Reliability
If high-amplitude voltages are applied to achieve stable control electrode voltage, then display stability is improved, but energy consumption increases
Solution Approach 1:
The invention changes the voltage parameter strategy by using a coupling capacitor to transfer voltage from the pixel electrode to the control electrode. This allows the control electrode to achieve stable voltage with lower amplitude signals, reducing power consumption while maintaining display stability through the capacitive coupling mechanism.
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, reduces light leakage, simplifies fabrication, and lowers production costs by eliminating the need for additional integrated circuits and high-amplitude voltages, while maintaining high transparency and stability.
Implementation Method 1
coupling a variation of the first coupling voltage to the control electrode via at least one coupling capacitor
Implementation Method 2
distribution of electrical field is generated between protrusions 15 on the upper substrate 13 and the slits SL of the transparent electrode 11 (e.g., indium tin oxide (ITO)) on the lower substrate 10 to drive liquid crystal (LC) molecule rotation
Data Source
AI summary
A method for driving a pixel electrode disposed on a first substrate operates by providing a voltage corresponding to a displaying data to the pixel electrode and a control electrode, such that the pixel electrode and the control electrode are at a floating connection state; providing a first coupling voltage to a coupling electrode; and coupling a variation of a first coupling voltage to the control electrode via at least one coupling capacitor, such that an absolute value of a voltage difference between the control electrode and a common electrode substantially greater than an absolute value of a voltage difference between the pixel electrode and the common electrode, wherein the common electrode is disposed on a second substrate and the second substrate is corresponding to the first substrate.