Multi-dot inversion LCD pixel coupling for power reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LCD devices with dot-inversion suffer from high power consumption due to maximum loading on common voltage drivers and source drivers during polarity inversion, leading to potential image quality issues like striped crosstalk and mura.
Innovation Solution
The implementation of a multi-dot inversion method where odd-numbered and even-numbered pixels in each column are coupled to alternating data lines and gate lines, with the source driver outputting signals of specific polarities to reduce voltage coupling between data lines, thereby minimizing striped crosstalk and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dot-inversion is implemented by inverting polarity of data driving signals after each period of gate driving signals, then polarity inversion is achieved to prevent liquid crystal damage, but power consumption increases due to maximum loading on common voltage driver and source driver
Solution Approach 1:
The pixel columns are divided into two types (first and second) with different coupling patterns. First pixel columns couple odd-numbered pixels to mth data line and even-numbered pixels to (m+1)th data line, while second pixel columns do the opposite. This segmentation allows the source driver to maintain constant polarity on adjacent data lines, avoiding the maximum loading condition that causes high power consumption during conventional dot-inversion operations.
2Reliability
If conventional dot-inversion is implemented, then polarity switching is achieved, but voltage coupling between data lines increases causing striped crosstalk and image mura
Solution Approach 1:
Different pixel columns are assigned different coupling patterns (local quality variation). First pixel columns use one coupling pattern while second pixel columns use the opposite pattern. This local differentiation ensures that voltage coupling between adjacent data lines is minimized in a localized manner, preventing the formation of striped crosstalk and image mura while still achieving effective polarity inversion at each pixel level.
Data Source
AI summary
An LCD device includes a plurality of data lines, a plurality gate lines, a pixel matrix, and a source driver. The pixel matrix includes an mth pixel column and an (m+1)th pixel column. The odd-numbered pixels of the mth pixel column are coupled to an mth data line and corresponding odd-numbered gate lines. The even-numbered pixels of the mth pixel column is coupled to an (m+1)th data line and corresponding even-numbered gate lines. The odd-numbered pixels of the (m+1)th pixel column is coupled to the (m+1)th data line and corresponding odd-numbered gate lines. The even-numbered pixels of the (m+1)th pixel column is coupled to an (m+2)th data line and corresponding even-numbered gate lines. The gate driver outputs the data driving signals having a first polarity to the odd-numbered data lines, and outputs the data driving signals having a second polarity to the even-numbered data lines.