Asymmetric Pixel Electrodes for Display Substrate Parasitic Capacitance
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Solution Overview
Problem
Liquid crystal display devices face potential fluctuations in pixel electrode potentials due to parasitic capacitance, leading to display tone deviation and reduced quality.
Innovation Solution
The substrate for the display device features pixel electrodes with elongated shapes, where long sides extend in one direction and short sides in the perpendicular direction, and a configuration of switching elements connected to scanning and image lines that charge pixel electrodes at different timings, reducing parasitic capacitance and potential fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pixel electrodes are arranged adjacent to each other in the direction in which scanning lines extend, then the number of data lines can be reduced, but large parasitic capacitance is generated between adjacent pixel electrodes charged at different timings
Solution Approach 1:
The pixel electrode is designed with an asymmetric shape where the long side extends in the scanning line direction and the short side extends in the data line direction. This asymmetric configuration reduces the overlapping area between adjacent pixel electrodes charged at different timings, thereby minimizing parasitic capacitance while maintaining the reduced data line structure
Solution Approach 2:
The patent applies different dimensional characteristics to different parts of the pixel electrode structure. The long side of the pixel electrode aligns with the scanning line direction to facilitate sequential charging, while the short side aligns with the data line direction to minimize interference with adjacent pixels. This local optimization of geometric properties resolves the contradiction between reduced data lines and minimized parasitic capacitance
2Productivity
If pixel electrodes are charged at different timings through sequential scanning, then the display can be driven with fewer data lines, but potential fluctuation occurs due to parasitic capacitance
Solution Approach 1:
The asymmetric pixel electrode shape with long side in scanning direction and short side in data line direction creates optimal electrical isolation between sequentially charged pixels. This geometric asymmetry maintains efficient sequential driving while stabilizing pixel potential by minimizing capacitive coupling during the charging process
Data Source
AI summary
A substrate for a display device includes image lines arranged in a first direction, scanning lines arranged in a second direction intersecting the first direction, pixel electrodes arranged in the first direction and the second direction, a first switching element, and a second switching element. Each of the pixel electrodes has an elongated shape extending in the first direction. The first switching element is connected to one of two scanning lines sandwiching the pixel electrodes, one of the pixel electrodes located at an even-numbered position from an end in the first direction, and one of the image lines adjacent to the even-numbered pixel electrode. The second switching element is connected to the other scanning line, one of the pixel electrodes located at an odd-numbered position from the end in the first direction, and one of the image lines adjacent to the odd-numbered pixel electrode.