Array Substrate Dot Inversion via Common Electrode Polarity Segmentation
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Solution Overview
Problem
Existing polarity inversion methods in TFT-LCDs, such as frame, row, column, and dot inversion, suffer from issues like flicker, crosstalk, and increased power consumption, particularly in the dot inversion method where frequent switching of polarity signals leads to higher display power consumption.
Innovation Solution
An array substrate design where first and second pixel units with opposite common electrode polarities are arranged alternately, with shared gate and common electrode lines between adjacent rows, allowing for efficient dot inversion without frequent switching of data signal voltages, thereby reducing power consumption and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dot inversion method is used with frequent polarity signal switching through data lines, then optimal image quality is achieved, but display power consumption increases
Solution Approach 1:
The pixel array is divided into first pixel units and second pixel units with alternating polarities. This segmentation allows different regions to have different common electrode polarity configurations, enabling polarity inversion without requiring frequent switching of data line signals, thus reducing power consumption while maintaining image quality
Solution Approach 2:
Instead of inverting polarity through data lines as in conventional dot inversion, this patent inverts polarity through the common electrode connections. By connecting common electrodes to alternating polarity power supply lines, the polarity inversion is achieved through the common electrode path rather than the data line path, fundamentally changing the inversion mechanism to reduce power consumption
2Use of energy by moving object
If frame inversion method is used, then power consumption is reduced, but flicker is generated due to nonuniform transmittance
Solution Approach 1:
Different regions (first pixel units vs second pixel units) are assigned different polarity characteristics through alternating connections to positive and negative polarity power supply lines. This local differentiation allows each region to maintain optimal transmittance characteristics while achieving overall polarity inversion, avoiding the uniform flicker effect of frame inversion
Solution Approach 2:
The patent transitions from temporal polarity inversion (frame inversion) to spatial polarity inversion through the alternating first and second pixel unit structure. By distributing different polarities across spatial regions rather than inverting all pixels uniformly over time, the method eliminates flicker while maintaining power efficiency
3Use of energy by moving object
If row inversion method is used, then power consumption is reduced, but horizontal crosstalk easily occurs
Solution Approach 1:
The alternating arrangement of first and second pixel units creates an asymmetric polarity distribution pattern that breaks the horizontal symmetry required for crosstalk. By assigning different polarities to adjacent pixel units in an alternating pattern, the electric field distribution becomes asymmetric, preventing the horizontal crosstalk that occurs in conventional row inversion methods
Data Source
AI summary
An array substrate is disclosed. The array substrate includes an array of pixel units on a substrate, gate lines, and data lines. The array substrate also includes common electrode lines. Each pixel unit includes a TFT, a pixel electrode, and a common electrode. The TFT is connected with one of the gate lines, one of the common electrode lines, and the common electrode. The pixel electrode is connected with the data line. In addition, the array of pixel units includes a plurality of first pixel units and a plurality of second pixel units with opposite potential polarities, where the first pixel units and the second pixel units are arranged alternatively in same rows/columns.