Auxiliary Capacitance Line for Display Flicker Reduction
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Solution Overview
Problem
In display devices with smaller pixels, the reduced capacitance leads to undesirable changes in pixel potential, causing flicker, especially noticeable during low-frequency operation.
Innovation Solution
Incorporating an auxiliary capacitance line that overlaps the scanning line and pixel electrode, stabilizing the voltage of the image signal and reducing pixel potential changes, thereby minimizing flicker and enabling more efficient pixel layout and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If pixel size is reduced to achieve smaller display devices, then display device size is improved, but capacitance becomes small causing pixel potential change and flicker
Solution Approach 1:
An auxiliary capacitance line is introduced as an intermediary element between the signal line and pixel electrode. This auxiliary capacitance line couples with the pixel electrode to provide additional capacitance, thereby stabilizing the pixel potential and reducing fluctuations caused by the coupling with the signal line. The auxiliary capacitance line acts as a buffer that mitigates the harmful effect of signal line coupling on pixel potential stability.
Solution Approach 2:
The invention changes the capacitance parameter of the pixel by adding an auxiliary capacitance line that overlaps with the scanning line. This increases the total capacitance of the pixel electrode, which helps maintain stable pixel potential despite the reduced pixel size. The overlapping configuration with the scanning line optimizes the capacitance value while minimizing area occupation.
2Reliability
If auxiliary capacitance line is added to stabilize pixel potential, then pixel potential stability is improved, but device complexity increases
Solution Approach 1:
The auxiliary capacitance line is merged with the existing scanning line structure by making it overlap with the scanning line in the planar view. This merging approach allows the auxiliary capacitance function to be achieved without adding completely separate structural elements, thereby reducing the increase in device complexity. The auxiliary capacitance line utilizes the space above the scanning line, integrating multiple functions into a compact configuration.
3Reliability
If auxiliary capacitance line overlaps scanning line to stabilize voltage, then pixel potential stability is improved, but manufacturing complexity increases
Solution Approach 1:
The auxiliary capacitance line is segmented into multiple portions: a first portion that overlaps with the scanning line and a second portion that connects to the pixel electrode. This segmentation allows the auxiliary capacitance line to be formed using separate patterning steps that can be integrated into the existing manufacturing process. The segmented structure enables precise control over the capacitance value and positioning while maintaining compatibility with standard fabrication techniques.
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 suppresses flicker visibility even at low-frequency drives, allows for smaller pixel sizes, and improves display quality by maintaining stable image signal voltage, while also reducing manufacturing costs through shared layer formation processes.
Implementation Method 1
a capacitance line producing capacitance together with the pixel electrode
Data Source
AI summary
According to one embodiment, a display device includes a pixel, a scanning line, a signal line, a pixel electrode, a first switching element, and a capacitance line producing capacitance together with the pixel electrode. The first switching element includes a first semiconductor layer connected to the signal line and the pixel electrode, and a first gate electrode opposed to the first semiconductor layer and connected to the scanning line. The capacitance line includes a first portion opposed to the scanning line and extending in an extension direction of the scanning line, a second portion connected to the first portion and opposed to the pixel electrode.