Storage Electrode Connecting Portion for LCD Kick-Back Voltage Control
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Solution Overview
Problem
Liquid crystal display devices face challenges in reducing kick-back voltage variations among pixels, leading to image sticking and defects like vertical moving lines, due to the existing electrode configurations and capacitive coupling phenomena.
Innovation Solution
The display device incorporates a storage electrode connecting portion with a transparent conductive material, overlapping and connecting with gate and data lines, which reduces the capacitance of coupling capacitors and stabilizes data voltage levels by applying a common voltage, thereby minimizing kick-back voltage differences among pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode configuration is used, then the device structure is simple, but kick-back voltage variations occur leading to image sticking and vertical moving lines
Solution Approach 1:
The storage electrode is divided into multiple segments: a first storage electrode portion adjacent to the second gate line, and a second storage electrode portion extending toward the first gate line. This segmentation allows different portions to serve different functions in reducing kick-back voltage variations while maintaining overall structural organization.
Solution Approach 2:
The storage electrode connecting portion is configured to overlap with gate lines and data lines in the planar dimension, creating capacitive coupling relationships that were not present in conventional configurations. This dimensional arrangement enables the storage electrode to effectively counteract kick-back voltage variations without adding vertical complexity.
2Area of moving object
If the storage electrode connecting portion overlaps with gate lines and data lines, then the aperture ratio increases, but the capacitance of coupling capacitors must be reduced
Solution Approach 1:
The storage electrode connecting portion is strategically positioned to overlap with specific segments of gate lines and data lines rather than uniformly across the entire pixel area. This localized overlapping configuration increases the aperture ratio in critical regions while controlling the capacitance of coupling capacitors to minimize kick-back voltage variations.
Solution Approach 2:
The invention adjusts the capacitance parameter of coupling capacitors by modifying the overlapping area, distance, and material properties between the storage electrode connecting portion and the gate/data lines. This parameter optimization allows the aperture ratio to be maximized while maintaining controlled capacitance values that prevent image sticking.
3Reliability
If the storage electrode is positioned adjacent to the pixel electrode, then the kick-back voltage is reduced, but the pixel structure becomes more complex
Solution Approach 1:
The storage electrode and storage electrode connecting portion are merged into a unified structure that is adjacent to the pixel electrode. This combined configuration reduces kick-back voltage variations effectively while minimizing the increase in structural complexity compared to fully separate components.
Solution Approach 2:
The storage electrode structure serves multiple functions: it reduces kick-back voltage variations, controls coupling capacitor capacitance, and maintains a relatively simple pixel structure. The first and second storage electrode portions work together to achieve voltage stabilization while the connecting portion manages capacitance control.
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 enhances image quality by reducing kick-back voltage variations, minimizing image defects, and increasing the aperture ratio of pixels by substituting part of the light blocking layer with the storage electrode connecting portion.
Implementation Method 1
The storage electrode connecting portion overlapping with the gate line and the data line reduces a capacitance of the coupling capacitor
Implementation Method 2
The storage electrode connecting portion may include a transparent conductive material
Data Source
AI summary
A display device includes a plurality of pixels, at least one of which includes a pixel electrode, a switch, a storage electrode, and a storage electrode, and a storage electrode connecting portion. The pixel electrode is in a pixel area corresponding to a first gate line, a second gate line, a first data line, and a second data line. The switch is connected to the first gate line, the first data line, and the pixel electrode. The storage electrode is adjacent to the pixel electrode. The storage electrode connecting portion is connected to the storage electrode and overlaps at least one of the first gate line or the second gate line. At least a portion of the storage electrode connecting portion is substantially parallel to the overlapped one of the first gate line or the second gate line.