Data Line Driver Charge Reuse for LCD Power Reduction
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Solution Overview
Problem
The high power consumption in matrix-type display panels, particularly in liquid crystal display (LCD) panels, due to the large capacitance of data lines, which increases with panel size, leading to inefficiencies in charge inversion driving methods.
Innovation Solution
A display apparatus with a data line driver that includes a switch circuit to connect or disconnect data lines from charge collection capacitors based on upper bits of pixel data, optimizing charge collection and re-use during specific display periods, and using separate capacitors for positive and negative polarity charge collection and re-use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the length of data line is increased according to display panel size, then the display area is improved, but the capacitance of data line increases leading to higher power consumption
Solution Approach 1:
The patent implements charge collection capacitors that recover and store the charge discharged from data lines during polarity inversion. By collecting the charge that would otherwise be wasted and reusing it in subsequent driving cycles, the system reduces the total power consumption while maintaining large display panel areas with long data lines.
2Reliability
If dot inversion driving is adopted to suppress liquid crystal material deterioration, then the reliability is improved, but the power consumption increases due to polarity inversion
Solution Approach 1:
The patent converts the harmful effect of charge discharge during polarity inversion into a beneficial resource by collecting the discharged charge in charge collection capacitors. This recovered charge is then reused to assist in driving the data lines during subsequent polarity inversions, thereby reducing the overall power consumption while maintaining the reliability benefits of dot inversion driving.
3Use of energy by moving object
If charge collection capacitor is introduced to reduce power consumption, then the energy efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent merges the charge collection capacitors with the existing data line driver circuitry, integrating the charge collection function into the data line driving system. This integration approach reduces the overall device complexity by combining multiple functions into a unified circuit architecture rather than adding completely separate components.
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 reduces power consumption by efficiently collecting and re-using charges, simplifying the circuit configuration, and improving charge collection and re-use efficiency by selectively connecting data lines to capacitors based on pixel data bits, thereby reducing unnecessary charge transfer and voltage levels.
Implementation Method 1
a capacitor; and a switch circuit configured to connect or disconnect the data line to or from the capacitor
Data Source
AI summary
A display apparatus includes a display panel containing data lines; a driving circuit configured to generate a data signal in response to a first pixel data of k (k is an natural number) bits and to supply the data signal to one of the data lines; and a capacitor. A switch circuit connects or disconnects the data line to or from the capacitor in response to upper m bits (m is a natural number smaller than k) of the first pixel data.