Thin Film Transistor Array Panel Shielding Gate Line Light Leakage
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Solution Overview
Problem
Vertically aligned liquid crystal displays experience significant light leakage near gate lines, especially under external impacts, which affects the display's contrast and viewing angles.
Innovation Solution
A thin film transistor array panel with a shielding electrode is introduced near the gate line to prevent light leakage, featuring a pixel electrode divided into sub-pixels with different voltages and a shielding line that extends parallel to the gate line to minimize electric field distortion and block parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a vertically aligned mode liquid crystal display is used, then contrast is improved and wide viewing angle is achieved, but side visibility deteriorates due to light leakage near the gate line
Solution Approach 1:
The pixel electrode is divided into multiple sub-pixel electrodes (first sub-pixel electrode, second sub-pixel electrode, third sub-pixel electrode) with different voltage levels. This segmentation creates multiple domains within each pixel, causing liquid crystal molecules to align in different directions and thereby improving side visibility while maintaining contrast
Solution Approach 2:
A shielding electrode is introduced between the gate line and the pixel electrode to block parasitic capacitance and prevent light leakage. This intermediary element effectively reduces electric field distortion near the gate line, solving the side visibility problem without affecting the overall display contrast
2Reliability
If an external impact is applied, then light leakage increases near the gate line, but the display structure remains fixed
Solution Approach 1:
The shielding electrode is positioned in advance to preemptively block parasitic capacitance and prevent light leakage before external impacts occur. This preliminary protective structure counteracts the harmful effects of external impacts on light leakage near the gate line
Solution Approach 2:
The display structure employs multiple functional layers including shielding electrodes, sub-pixel electrodes with different voltage levels, and liquid crystal materials with specific alignment properties. This composite structure provides robust performance that maintains light leakage prevention under external impacts
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
The solution effectively reduces light leakage and enhances side visibility by aligning liquid crystal molecules in multiple directions, improving the display's contrast and viewing angles while maintaining image quality under external impacts.
Implementation Method 1
shielding line overlapping the data line and extending lengthwise according to the data line; and an electrode connecting two neighboring shielding lines
Implementation Method 2
The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrodes
Implementation Method 3
The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrodes to determine the direction of the molecular axes of liquid crystal molecules in the liquid crystal layer with respect to the display surface
Implementation Method 4
The control of the direction of the liquid crystal molecules effectively determines the polarization of incident light through the liquid crystal layer
Implementation Method 5
a capacitor connected to the third switching element and the common voltage line
Data Source
AI summary
A liquid crystal display includes a first gate line; a common voltage line separated from the first gate line; a data line insulated from and crossing the first gate line and the common voltage line; a first switching element connected to the first gate line and the data line; a second switching element connected to the first gate line and the data line; a first liquid crystal capacitor connected to the first switching element; a second liquid crystal capacitor connected to the second switching element; a third switching element connected to the first switching element; an assistance capacitor connected to the third switching element and the common voltage line; and a shielding electrode extending in the same direction as the first gate line and connected to the first switching element.