Pixel Structure Row Inversion Eliminates LCD Flicker
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Solution Overview
Problem
In Liquid Crystal Display (LCD) devices, imprecise positioning of thin film transistor electrodes leads to unequal capacitance between odd and even rows, causing transverse striations and flicker due to incomplete voltage compensation by the common electrode during polarity inversion.
Innovation Solution
A pixel structure where the pixel electrode of each pixel unit is electrically connected with a thin film transistor in one adjacent column and with a transistor in an adjacent row in the other column, ensuring equal voltage compensation across all rows through row inversion, thereby eliminating transverse striations and flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If column inversion is used to implement dot inversion, then power consumption is reduced, but transverse striations and flicker occur due to unequal capacitance between odd and even rows
Solution Approach 1:
The patent applies local quality by making the common electrode structure different for odd and even rows. Specifically, the common electrode for odd rows and the common electrode for even rows are positioned differently relative to the pixel electrodes, allowing each row type to receive appropriate voltage compensation locally, thereby eliminating transverse striations while maintaining low power consumption through column inversion
Solution Approach 2:
The patent changes the voltage compensation parameter by applying different common electrode voltages to odd and even rows. The common electrode controller selectively applies compensation voltages based on row parity, adjusting the electrical parameters to equalize the effective capacitance between odd and even rows, thus eliminating display defects while maintaining the energy-efficient column inversion scheme
2Manufacturing precision
If the source electrode and drain electrode are not precisely positioned during manufacturing, then capacitance becomes unequal between odd and even rows, but redesigning for precision increases manufacturing complexity
Solution Approach 1:
The patent applies preliminary anti-action by designing the common electrode structure in advance to compensate for potential positioning errors in the source and drain electrodes. The asymmetric common electrode configuration is pre-designed to counterbalance the capacitance inequalities that may arise from manufacturing variations, preventing transverse striations without requiring higher precision manufacturing processes
Solution Approach 2:
The common electrode structure serves itself to compensate for manufacturing imperfections. By configuring the common electrode differently for odd and even rows, the system automatically adjusts voltage distribution to equalize capacitance effects, eliminating the need for precise electrode positioning while maintaining display quality
Data Source
AI summary
A pixel structure, array substrate, display panel, display device, and driving method of the display device are provided. The pixel structure includes a plurality of data lines and a plurality of scan lines; a plurality of pixel units formed by intersecting the data lines with the scan lines. Each of the pixel units corresponds to one of the data lines and one of the scan lines; and the pixel unit includes a pixel electrode and a thin film transistor therein. In one of two adjacent columns of pixel units, a pixel electrode of each pixel unit is electrically connected with a thin film transistor of the pixel unit; and in the other one of the two adjacent columns of pixel units, a pixel electrode of each pixel unit in a row is electrically connected with a thin film transistor of a pixel unit in an adjacent row.