Dummy Wiring for Display Brightness Fluctuation Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices face challenges in downsizing due to increased video signal lines, leading to fluctuations in pixel brightness caused by parasitic capacitance between pixel electrodes and video signal lines, especially when pixel electrodes are displaced during patterning.
Innovation Solution
Incorporating first and second dummy wirings connected to video signal lines, which extend along the contour of the region between pixel electrodes and oppose each other, averaging the potential affect on pixel electrodes, thereby reducing brightness fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between pixel electrode and video signal line is reduced, then the display device can be downsized, but the parasitic capacitance increases causing brightness fluctuations
Solution Approach 1:
A dummy wiring is introduced as an intermediary element between the video signal line and pixel electrode. This dummy wiring extends from the video signal line toward the pixel electrode but stops before reaching it, creating a shielding effect that reduces the parasitic capacitance influence on the pixel electrode potential, thereby mitigating brightness fluctuations while allowing closer spacing
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and isolated by introducing the dummy wiring structure. The dummy wiring captures and redirects the capacitive coupling away from the pixel electrode, effectively separating the harmful electrical influence from the functional pixel region
2Stability of the object's composition
If dummy wiring is added to reduce parasitic capacitance effect, then brightness uniformity improves, but device complexity increases
Solution Approach 1:
The dummy wiring is designed with uniform width and continuous extension along the video signal line, creating a homogeneous structure that consistently shields all pixel electrodes along the line. This uniform approach ensures consistent brightness across the display without requiring complex variable geometry
Solution Approach 2:
The dummy wiring serves multiple functions simultaneously: it acts as a shield against parasitic capacitance, maintains design flexibility for pixel electrode positioning, and can be implemented as a simple linear extension without requiring additional active components or complex control circuits
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 dummy wirings effectively average the potential impact on pixel electrodes, reducing fluctuations in brightness even when pixel electrodes are displaced relative to video signal lines, ensuring consistent display performance.
Implementation Method 1
a parasitic capacitance Cds exists between the video signal line and the pixel electrode, and the potential of the pixel electrode is affected by the potential of the video signal line via the parasitic capacitance Cds
Data Source
AI summary
Provided is a display device (1), including: two pixels in a region (A) surrounded by two video signal lines (DL) and two scanning signal lines (GL); a first dummy wiring, which is connected to one video signal line of the two video signal lines; and a second dummy wiring, which is connected to a different one of the two video signal lines (DL) from the one video signal line to which the first dummy wiring is connected, in which the first dummy wiring and the second dummy wiring each extend along a contour of the region (A) to a position between the two pixels, and further extend so that respective end portions are opposed to each other between the two pixels.