Display Device Gate Voltage Polarity Matching for Power Reduction
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Solution Overview
Problem
The Z-inversion system for liquid crystal display devices experiences increased power consumption due to unnecessarily high and low gate voltages required to turn on and off transistors, respectively, as a result of using identical gate voltages for transistors with data voltages of different polarities.
Innovation Solution
A display device and method where gate voltages of different polarities are supplied to transistors connected to data lines of odd and even columns, optimizing the gate voltage signals to match the polarity of the data voltage, reducing power consumption by minimizing the magnitude of gate voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If identical gate voltages are supplied to transistors connected to data lines of different polarities, then the circuit operation is simplified, but the gate voltage magnitude increases causing higher power consumption
Solution Approach 1:
The patent applies local quality by differentiating gate voltage supply based on the polarity of data lines. Even columns receive gate voltages of one polarity while odd columns receive gate voltages of opposite polarity, optimizing each local region's power consumption characteristics while maintaining overall system functionality
Solution Approach 2:
The patent segments the gate voltage supply system into separate control paths for even and odd columns. This segmentation allows independent optimization of gate voltage waveforms for each group, reducing the magnitude of gate voltage signals and thereby lowering power consumption without complicating the overall circuit operation
2Reliability
If gate voltage magnitude is increased to ensure proper transistor switching, then transistor reliability is improved, but power consumption increases
Solution Approach 1:
The patent changes the polarity parameter of gate voltages based on data line polarity. By adjusting the gate voltage waveform polarity to match the data line polarity, the patent maintains sufficient voltage magnitude for reliable transistor switching while minimizing unnecessary voltage excursions, thereby reducing power consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach decreases power consumption by optimizing gate voltage signals, reducing the amplitude of gate voltage waveforms and thus lowering overall power usage in the display device.
Implementation Method 1
A first gate signal having a different maximum voltage than the second gate signal is supplied to the first gate line. A second gate signal having a different maximum voltage than the first gate signal is supplied to the second gate line.
Data Source
AI summary
Disclosed are a display device and a method of driving the same. The display device includes: a panel on which pixels, defined by intersections of a plurality of gate lines and a plurality of data lines, are alternately connected to one side and another side of the data line and the gate line; a data driver which supplies a data voltage having a different polarity to the data lines in odd columns even columns; and, a gate driver which supplies a gate voltage, which has first polarity and corresponds to a data voltage having the first polarity, to gate lines in odd rows, and supplies a gate voltage, which has a second polarity, and corresponds to a data voltage having the second polarity, to gate lines in even rows.