Selection Circuit Time-Division Multiplexing for Display Power Reduction
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Solution Overview
Problem
The reduction in the number of drivers in liquid crystal display devices to lower costs results in increased power consumption due to the connection of multiple data lines to each output channel, which is inefficient.
Innovation Solution
A selection circuit with first and second selection cells that time-divide and multiplex data voltages across multiple data lines in response to specific selection control signals, reducing the number of output channels needed and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of drivers is reduced to lower costs, then device complexity is reduced, but power consumption increases
Solution Approach 1:
The patent applies periodic action by time-division multiplexing data voltages across multiple data lines using alternating positive and negative polarities in sequential time slots. The selection circuit switches between different data lines periodically, allowing a reduced number of driver output channels to serve multiple data lines through time-shared operation, thereby maintaining functionality while reducing driver count and power consumption.
Solution Approach 2:
The patent implements dynamics by introducing a selection circuit that dynamically switches the connection between output channels and data lines based on time-division multiplexing signals. This dynamic switching allows the system to adapt the data line connections in real-time, enabling fewer drivers to efficiently manage more data lines through controlled temporal allocation, thus resolving the contradiction between reduced driver count and power consumption.
2Device complexity
If multiple data lines are connected to each output channel to reduce driver count, then device complexity decreases, but power consumption increases
Solution Approach 1:
The patent employs periodic action by alternating the application of positive and negative data voltages to different data lines in sequential time slots. The selection circuit periodically switches connections between output channels and data lines, allowing each output channel to serve multiple data lines over time. This periodic time-division multiplexing reduces the number of active output channels needed, thereby reducing overall power consumption while maintaining the ability to drive multiple data lines.
Solution Approach 2:
The patent applies universality by designing the selection circuit to enable each output channel to perform multiple functions by connecting to different data lines at different time slots. Through time-division multiplexing, a single output channel can serve multiple data lines sequentially, making the output channel universal in its functionality. This multi-functionality allows the system to reduce the total number of output channels required, thereby reducing device complexity and power consumption.
Data Source
AI summary
A display device according to an embodiment includes switches. Low and high voltages of a selection control signal applied to each of gate electrodes of the switches are varied according to whether one of positive and negative data voltages is applied to each of the source electrodes of the switches. As such, the swing width of the selection control signal can be maintained regardless of the positive and negative data voltages. In accordance therewith, undesired power consumption can be prevented.