Liquid Crystal Display Pixel Electrode Geometry for Smear Suppression
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Solution Overview
Problem
Conventional methods for suppressing longitudinal smear in liquid crystal display devices either increase manufacturing time and cost or lower the numerical aperture, as they require additional steps or shielding electrodes that can lead to positional inaccuracies and brightness reduction.
Innovation Solution
The solution involves setting the size of pixel electrodes in the direction of video signal lines to be larger for one electrode and smaller for another, with specific gap relationships between pixel electrodes and video signal lines to equalize parasitic capacitance values, and using a manufacturing method that corrects the positions and sizes of pixel electrodes based on precise measurements of video signal lines to ensure uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding electrode is formed on the counter substrate to suppress longitudinal smear, then longitudinal smear is suppressed, but manufacturing time is prolonged and manufacturing cost is increased
Solution Approach 1:
The invention extracts the essential function of longitudinal smear suppression by adjusting pixel electrode dimensions and positions, eliminating the need for the shielding electrode structure. This removes the harmful element (shielding electrode) while preserving the beneficial effect (longitudinal smear suppression).
Solution Approach 2:
The invention changes the parameters of pixel electrodes (size in the direction of video signal lines and gap distances to video signal lines) to achieve longitudinal smear suppression. By adjusting these geometric parameters, the parasitic capacitance is balanced without requiring additional shielding electrode structures.
2Reliability
If a shielding electrode is formed between the video signal line and the pixel electrode on the TFT substrate, then longitudinal smear is suppressed, but the numerical aperture is lowered and brightness is reduced
Solution Approach 1:
The invention removes the shielding electrode structure that was causing brightness reduction while maintaining longitudinal smear suppression through pixel electrode geometry adjustment. This extracts the harmful element without sacrificing the beneficial effect.
Solution Approach 2:
The invention achieves longitudinal smear suppression by changing pixel electrode parameters (size and position) rather than adding shielding electrodes. This parameter adjustment approach maintains the numerical aperture and brightness while still suppressing longitudinal smear.
3Reliability
If the thickness of the insulation layer is increased to prevent pixel electrode potential fluctuation, then longitudinal smear is suppressed, but manufacturing complexity is increased
Solution Approach 1:
Instead of changing the thickness parameter of the insulation layer, the invention adjusts the geometric parameters of pixel electrodes (size and position) to balance parasitic capacitance. This approach achieves potential stability without increasing structural complexity.
Data Source
AI summary
The present invention provides a liquid crystal display device which can easily prevent the generation of longitudinal smear. The display device includes a display panel having a plurality of scanning signal lines, a plurality of video signal lines, a plurality of thin film transistors and a plurality of pixel electrodes arranged in a matrix array. In a state that a gap between two neighboring video signal lines with one pixel electrode out of the plurality of pixel electrodes sandwiched therebetween in a region where one pixel electrode is arranged is larger than a gap between two neighboring video signal lines with another pixel electrode different from one pixel electrode sandwiched therebetween in a region where another electrode is arranged, a size of one pixel electrode is set larger than a size of another pixel electrode.