Island Electrode Pixel Structure for OCB LCD Response Time
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optically compensated birefringence liquid crystal display (OCB LCD) technologies face challenges in quickly transitioning liquid crystal molecules from the splay state to the bend state, which is essential for improving response time and reducing warm-up time, and existing solutions like high voltage or polymer addition often lead to difficulties in manufacturing and light leakage issues.
Innovation Solution
A pixel structure with a scan line, data line, active device, and island electrode is designed, where the island electrode is electrically coupled to a different voltage than the pixel electrode, forming a transverse electric field, and a capacitance electrode is used to enhance the transition of liquid crystal molecules from the splay to the bend state, while the color filtering array substrate includes an opening above the black matrix layer to reduce light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high voltage is applied to generate a more intensive electric field for faster liquid crystal molecule transition, then the response time is improved, but it becomes difficult to obtain appropriate driving chips that can endure the high voltage
Solution Approach 1:
The pixel electrode is divided into a first pixel electrode and a second pixel electrode, with the second pixel electrode having a smaller area and being disposed at a position overlapping the first pixel electrode and the common electrode. This segmentation creates a localized intensive electric field in the overlapping region, accelerating liquid crystal molecule transition without requiring system-wide high voltage that would damage driving chips.
2Speed
If polymer is added to the liquid crystal layer and UV is emitted to form a polymer wall for sustaining bend state, then the transition speed is improved, but a light leakage phenomenon occurs
Solution Approach 1:
The patent removes the polymer addition step and UV irradiation process entirely, replacing them with an electric field-based approach using the second pixel electrode. This extraction eliminates the light leakage problem caused by polymer walls while maintaining fast response performance through localized intensive electric fields.
3Speed
If slits are formed on the pixel electrode or protrusions are formed above the pixel structure to change liquid crystal molecule arrangement, then the transition speed is improved, but the device complexity increases
Solution Approach 1:
The patent combines the pixel electrode function with the intensive electric field generation function by integrating the second pixel electrode into the existing pixel structure. This merging achieves fast response performance without adding separate complex structures like slits or protrusions, maintaining manufacturing simplicity while improving performance.
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 design significantly reduces the response time of the liquid crystal display panel and eliminates light leakage, enabling faster transition of liquid crystal molecules to the bend state, thus improving the 'ready-to-use' property and display performance.
Implementation Method 1
the island electrode is electrically coupled to a voltage V, and the pixel electrode is electrically coupled to a driving voltage Vd that is different from the voltage V, such that a transverse electric field is formed between the island electrode and the pixel electrode
Data Source
AI summary
A pixel structure of a color filtering array substrate includes a color filtering layer, a black matrix layer, and an electrode layer. The black matrix layer surrounds the color filtering layer. The electrode layer covers the color filtering layer and the black matrix layer. Besides, the electrode layer has at least one opening therein, and the opening is located above the black matrix layer.