Liquid Crystal Display Pixel Electrode Shielding Static Charges
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Solution Overview
Problem
In liquid crystal display devices operating in Fringe Field Switching (FFS) mode, localized electric charges can cause disordered alignment of liquid crystal molecules, leading to backlight leakage and display defects, especially in non-display areas where electric fields are not formed, resulting in poor display quality during black operations.
Innovation Solution
The design incorporates a pixel electrode structure where the first pixel electrode is widened to extend beyond the active area and face a shield layer, creating a region outside the active area to shield localized electric charges, and the pixel electrode includes slits and electrode portions arranged to form penetration regions, ensuring that the alignment of liquid crystal molecules is controlled and maintained even when electric charges are localized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy pixel is arranged in a non-display area to form a protection device against static electricity, then reliability against static electricity is improved, but device complexity increases due to additional structures in non-display areas
Solution Approach 1:
The pixel electrode structure is designed to serve dual functions: it acts as both a functional pixel electrode for display control and as a protection device against static electricity. By extending the pixel electrode into the non-display area and forming capacitance with the shield layer, the same structure provides both display functionality and electrostatic protection, eliminating the need for separate dummy pixels or protection structures.
2Reliability
If the pixel electrode is extended to outside the active area to shield localized electric charges, then display quality is improved by preventing backlight leakage, but manufacturing precision requirements increase due to extended electrode structures
Solution Approach 1:
The shield layer serves as an intermediary element that facilitates the protective function. By introducing this intermediate layer between the pixel electrode and the liquid crystal layer, the system can effectively manage localized electric charges and prevent backlight leakage during black displays, while the shield layer itself helps define the electrostatic protection mechanism.
3Manufacturing precision
If slits and electrode portions are arranged to form penetration regions for controlling liquid crystal alignment, then alignment control is improved, but device complexity increases due to intricate electrode patterns
Solution Approach 1:
The pixel electrode is segmented into multiple electrode portions separated by slits, creating penetration regions that allow precise control of liquid crystal alignment. This segmentation enables the electrode structure to manipulate electric field distribution effectively, ensuring proper liquid crystal orientation while maintaining a manageable design through systematic division into functional segments.
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 configuration effectively controls optical leakage and maintains display quality by shielding regions with undesirable electric charges, preventing backlight leakage during black displays and improving overall display grace.
Implementation Method 1
alignment of liquid crystal molecules is controlled using the fringe electric field formed between the pixel electrode and the common electrode
Implementation Method 2
the first pixel electrode includes an extending portion extending to outside of the active area and facing the second segment of the shield layer
Data Source
AI summary
In an array substrate, a first pixel is arranged at one end of an active area, and a second pixel is arranged adjacent to the first pixel more inside of the active area than the first pixel. A common electrode extends to the first and second pixels, and an insulating layer is formed on the common electrode. First and second pixel electrodes are formed on the insulating layer in the first and second pixels. The pixel electrodes include electrode portions forming slits facing the common electrode. A second substrate includes a shield layer arranged outside the active area. The first pixel electrode is formed more widely than the second pixel electrode, and extends to outside of the active area. The first pixel electrode includes an extending portion extending to outside of the active area and facing the shield layer.