Flat Panel Display Charge Sharing Control Circuit
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Solution Overview
Problem
Flat panel displays, particularly in portable devices, face challenges in minimizing power consumption due to the need for frequent charging and discharging of pixel units, which increases energy expenditure.
Innovation Solution
A control circuit with a power supply unit, data driver, first and second switch sets, and a timing controller that enables charge sharing by reallocating and discharging charges stored in pixel units through specific control signals, reducing power consumption by balancing voltage levels and recycling energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel units are frequently charged and discharged to maintain display operation, then display function is maintained, but power consumption increases
Solution Approach 1:
The pixel units perform charge sharing with each other autonomously during the horizontal blanking period without requiring continuous power supply intervention. The capacitor in each pixel unit shares charge with adjacent pixel units through switching circuits, enabling the display to maintain its function while reducing external power consumption.
Solution Approach 2:
Instead of discharging all charges to ground during each refresh cycle, the invention recovers charges by having pixel units share charges among themselves. The charge sharing mechanism allows pixel units to maintain their voltage levels by exchanging charges, thereby recovering energy that would otherwise be lost and reducing the need for frequent recharging from the power supply.
2Use of energy by moving object
If charge sharing is implemented to reduce power consumption, then energy expenditure is minimized, but circuit complexity increases
Solution Approach 1:
The switching circuit is divided into multiple independent switch units, with each switch unit controlling charge sharing between adjacent pixel units. This segmentation allows the complex charge sharing function to be implemented through simple, repetitive circuit modules rather than a single complex circuit, making the system more manageable and easier to manufacture.
Solution Approach 2:
Charge sharing is performed periodically during the horizontal blanking period when no display refresh is occurring. This periodic action allows the charge sharing operation to be interleaved with the normal display refresh cycle without interfering with image quality, effectively utilizing otherwise wasted time to reduce 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
The solution effectively reduces power consumption by sharing and recycling charges during polarity swapping, thereby minimizing energy expenditure in flat panel displays.
Implementation Method 1
a first switch set including a plurality of switches, each of which is electrically connected to two of the plurality of data lines... outputting a first control signal to optionally switch on the switches in the first switch set in a first duration to re-allocate charges stored in the plurality of pixel units
Implementation Method 2
a second switch set including a plurality of switches, which are electrically connected to the voltage output pin in parallel, and electrically connected to first selected ones of the plurality of data lines, respectively... outputting a second control signal to optionally switch on the switches in the second switch set in a second duration to discharge charges stored in the plurality of pixel units via the voltage output pin
Data Source
AI summary
A control circuit and a method for charge sharing are provided. The control circuit and method are applied to a flat panel display including a plurality of pixel units. The control circuit includes a power supply unit, a data driver, a first switch set, a second switch set, a second switch set, and a timing controller. The control method includes steps of: outputting a first control signal to optionally switch on the switches in the first switch set in a first duration to re-allocate charges stored in the plurality of pixel units; and outputting a second control signal to optionally switch on the switches in the second switch set in a second duration to discharge charges stored in the plurality of pixel units via the voltage output pin.