Charge Sharing Unit for Display Data Line Power Reduction
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving sufficient charge sharing among data lines within reduced time, especially at increased driving frequencies, leading to high power consumption due to repeated polarity inversion of data signals.
Innovation Solution
A display device with a charge sharing unit that includes two chargers allocated to respective data line groups, allowing for selective charging and discharging operations under control of a timing controller, using positive and negative control voltages for voltage boosting, thereby reducing voltage variation and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a general charge sharing method is used to equalize potentials of data lines, then power consumption is reduced, but sufficient time cannot be secured for charge sharing at increased driving frequencies
Solution Approach 1:
The patent divides the data lines into multiple groups and allocates different chargers to different groups. This segmentation allows parallel charge sharing operations across multiple groups, reducing the total time required while maintaining effective charge sharing for power consumption reduction.
Solution Approach 2:
The chargers are pre-positioned and connected to specific data line groups through switching circuits. This preliminary arrangement enables immediate charge sharing when needed, eliminating the time delay associated with connecting chargers during operation and ensuring sufficient charge sharing time even at high driving frequencies.
2Use of energy by moving object
If data lines are charged with intermediate voltage to reduce voltage variation, then power consumption decreases, but charge sharing time increases
Solution Approach 1:
By segmenting data lines into groups with dedicated chargers, the charge sharing operation is performed simultaneously on multiple groups. This parallel processing reduces the overall duration while still achieving the voltage equalization needed for reduced power consumption.
Solution Approach 2:
The patent employs switching circuits that dynamically connect chargers to specific data line groups based on operational needs. This dynamic configuration allows the system to optimize between charge sharing speed and effectiveness, reducing voltage variation for lower power consumption without excessively increasing charge sharing duration.
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
Enables rapid charge sharing among data lines, reducing current consumption and power usage by applying intermediate voltages between positive and negative data signal levels, thus decreasing overall power consumption of the display device.
Implementation Method 1
a first charger allocated to a first data line group of the plurality data lines, and a second charger allocated to a second data line group of the plurality data lines, the charge sharing unit selectively performing charging and discharging operations among the first data line group, the first charger, the second data line group and the second charger
Data Source
AI summary
A display device and a method for driving the same are disclosed. The disclosed display device includes a display panel for displaying an image corresponding to a plurality of data signals transferred via a plurality of data lines, a data driver for driving the plurality of data lines, a timing controller for controlling driving timing of the data driver, and a charge sharing unit comprising a first charger allocated to a first data line group of the plurality of data lines, and a second charger allocated to a second data line group of the plurality of data lines, the charge sharing unit selectively performing charging and discharging operations among the first data line group, the first charger, the second data line group and the second charger under control of the timing controller.