Gate Sharing Structure for LCD Power Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in reducing power consumption while maintaining high image quality, as existing technologies often compromise between these two objectives.
Innovation Solution
The implementation of a liquid crystal display device with a sub-pixel structure connected by shared gate lines, utilizing an interlace driving scheme and a horizontal 2-dot inversion scheme to reduce power consumption and minimize flicker and crosstalk, while enhancing aperture ratio through a gate sharing structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sub-pixels are connected by shared gate lines with interlace driving scheme, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The gate driver operation is segmented into two subframe intervals: first subframe interval for even-numbered gate lines and second subframe interval for odd-numbered gate lines. This segmentation allows the gate driver to activate only half of the gate lines at any given time, reducing power consumption while managing device complexity through temporal division of operations
Solution Approach 2:
The gate driver operates periodically by alternating between driving even-numbered gate lines during the first subframe interval and odd-numbered gate lines during the second subframe interval. This periodic action pattern enables power reduction through duty cycling while maintaining complete pixel addressing coverage over the full frame period
2Object-generated harmful factors
If data voltage with different polarities is provided to neighbor data lines, then flicker and crosstalk are minimized, but device complexity increases
Solution Approach 1:
Different polarity patterns are applied to different data lines based on their column positions. Odd-column sub-pixels receive data voltage with one polarity pattern while even-column sub-pixels receive data voltage with the opposite polarity pattern. This local differentiation of voltage polarity minimizes flicker and crosstalk effects specific to each column region
Solution Approach 2:
The polarity of data voltage is inverted between odd-column and even-column sub-pixels. Instead of using the same polarity for all data lines, the system applies opposite polarities to adjacent columns, which counteracts the formation of image flicker and reduces crosstalk between neighboring pixels
3Area of stationary object
If gate sharing structure is implemented, then aperture ratio is increased, but manufacturing precision requirements increase
Solution Approach 1:
Adjacent sub-pixels in the column direction are merged to share common gate lines. Specifically, odd-column sub-pixels share even-numbered gate lines while even-column sub-pixels share odd-numbered gate lines. This merging of gate line resources reduces the total number of gate lines required, thereby increasing the aperture ratio
Solution Approach 2:
Each gate line is designed to serve multiple sub-pixels through the gate sharing structure. Gate lines function universally by controlling multiple sub-pixels across different columns, with even-numbered gate lines serving odd-column sub-pixels and odd-numbered gate lines serving even-column sub-pixels through the interlace driving scheme
Data Source
AI summary
A liquid crystal display (LCD) device are disclosed, which reduce power consumption and improve an image quality. The LCD device includes a liquid crystal panel in which a plurality of sub-pixels is defined by intersection of a plurality of gate lines and a plurality of data lines, and sub-pixels adjacent to each other in a column direction are connected by sharing the plurality of gate lines. A gate driver may sequentially transfer a scan pulse to even-numbered gate lines and then sequentially transferring a scan pulse to odd-numbered gate lines. A data driver may be synchronized with the applied scan pulse in providing data voltage to columns of sub-pixels. The data driver provides the data voltage having different polarities to a neighbor data line during one frame interval such that sub-pixels are driven by a horizontal 2-dot inversion scheme.