Data Line Demultiplexer for Column Inversion Power Reduction
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Solution Overview
Problem
In display devices with column inversion driving, the frequent inversion of data signal voltage polarity leads to high power consumption due to the need for continuous voltage polarity changes across data signal terminals.
Innovation Solution
A data line demultiplexer with a switching module that communicates each data signal terminal with at least two columns of sub-pixels, where the columns are spaced apart by an odd number of sub-pixels connected to other data signal terminals, maintaining the same voltage polarity during column inversion driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If column inversion driving method is used to drive display device, then sub-pixel driving capability is improved, but power consumption increases due to frequent voltage polarity inversion
Solution Approach 1:
The patent segments the sub-pixel columns into different groups (first group and second group) with alternating polarity assignments. This segmentation allows the data signal terminal to maintain a fixed polarity while different column groups receive appropriate inverted or non-inverted signals through the switching module, thereby enabling column inversion driving without requiring the data signal itself to invert polarity frequently.
Solution Approach 2:
The switching module acts as an intermediary between the data signal terminal and the sub-pixel columns. It receives a single-polarity data signal and selectively inverts or passes through the signal based on which column group is being driven, thus mediating the polarity requirement conflict between column inversion driving and fixed-polarity data signals.
2Adaptability or versatility
If data signal polarity is inverted frequently for each sub-pixel column, then column inversion driving is achieved, but energy efficiency deteriorates
Solution Approach 1:
The patent merges multiple sub-pixel columns into two main groups (first group with same polarity, second group with opposite polarity). By treating these groups as unified units rather than individually inverting each column, the system reduces the frequency of polarity changes from multiple times per frame to just once per frame, significantly improving energy efficiency.
Solution Approach 2:
The patent implements a periodic polarity inversion scheme where the polarity inversion occurs once per frame cycle rather than continuously for each column. The switching module alternates between driving the first group and second group with appropriate polarity assignments in a periodic manner, reducing energy loss associated with frequent switching.
Data Source
AI summary
The disclosure relates to a data line demultiplexer, a display substrate, a display panel, and a display device. The data line demultiplexer includes a switching module, a plurality of switching signal terminals and a plurality of data signal terminals. The switching module is respectively connected to the plurality of switching signal terminals, the plurality of data signal terminals and M columns of pixel units in a display device. The switching module is capable of communicating each of the data signal terminals with at least two columns of sub-pixels under control of the plurality of switching signal terminals, wherein every two columns of sub-pixels that are connected with one data signal terminal are spaced apart by an odd number of columns of sub-pixels that are connected with other data signal terminals.