Array Substrate Dual Storage Capacitors Reduce LCD Flicker
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Solution Overview
Problem
Current Liquid Crystal Display (LCD) technologies experience flicker due to Thin Film Transistor (TFT) leakage, which is exacerbated by the need for larger storage capacitors to prevent gray scale changes, leading to a reduction in the aperture ratio of the pixel.
Innovation Solution
The implementation of an array substrate with a metal layer electrically connected to both the pixel electrode and the drain electrode of the TFT, forming dual storage capacitors to enhance the storage capacity without increasing the size of the electrodes, thus reducing flicker and maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger storage capacitor is used to prevent gray scale changes caused by TFT leakage, then the flicker phenomenon is reduced, but the aperture ratio of the pixel is reduced
Solution Approach 1:
The patent introduces a touch panel insulation layer with insulation portions that extend in the thickness direction (vertical dimension) to form storage capacitors. This vertical dimension allows the storage capacitors to be formed without increasing the lateral footprint of the pixel electrode or common electrode, thereby maintaining the aperture ratio while providing sufficient storage capacity to prevent flicker.
Solution Approach 2:
The storage capacitors are nested within the existing pixel structure by utilizing the touch panel insulation layer's insulation portions that are already positioned between the common electrode and pixel electrode. This nesting approach allows the storage function to be integrated into the existing structure without requiring additional space that would reduce the aperture ratio.
2Stability of the object's composition
If the storage capacitor size is increased to improve display stability, then TFT leakage effects are mitigated, but the electrode sizes must be larger which reduces aperture ratio
Solution Approach 1:
The patent utilizes the thickness direction (vertical dimension) by forming storage capacitors within the touch panel insulation layer's insulation portions. This allows the storage capacitor to be formed without increasing the lateral dimensions of the electrodes, maintaining display stability while preserving the aperture ratio.
Solution Approach 2:
The touch panel insulation layer's insulation portions serve dual functions: they provide electrical insulation between the common electrode and pixel electrode, and simultaneously form the storage capacitors for stabilizing the display. This multi-functionality eliminates the need for separate storage capacitor structures that would require larger electrode areas.
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 effectively reduces flicker caused by TFT leakage while maintaining the pixel aperture ratio by utilizing dual storage capacitors, ensuring improved display performance.
Implementation Method 1
by overlapping disposed, the insulation portion of the touch panel insulation layer and the passivation layer sandwiched by the common electrode and the pixel electrode to form the first storage capacitor; and by overlapping disposed, the insulation portion of the touch panel insulation layer sandwiched by the metal layer and the common electrode to form the second storage capacitor
Data Source
AI summary
The present application discloses an array substrate, a liquid crystal display panel and a liquid crystal display device; a metal layer is designed to be added between the pixel electrode and the common electrode. The metal layer can form a first storage capacitor with the pixel electrode and formed a second storage capacitor with the common electrode, such as the dual storage capacitors to enlarge the storage capacitor to improve the flicker caused by TFT leakage, ensure the display effect, and the two storage capacitor are overlapped set, the aperture ratio of the pixel is not reduced.