Flat Display Driving Circuit With Dynamic Impedance Switching
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Solution Overview
Problem
The existing driving circuits for flat displays generate significant heat due to internal impedance during the charging and discharging processes, which can degrade the reliability and performance of the display panel, especially as pixel density increases.
Innovation Solution
A driving circuit with dynamically changeable internal impedance, featuring a detecting circuit that reduces impedance during charging and discharging stages and recovers the original impedance after completion, utilizing field-effect transistors and switch circuits to minimize power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the internal impedance of the driving circuit is reduced during charging and discharging, then heat generation is reduced, but the circuit complexity increases due to dynamic impedance switching
Solution Approach 1:
The patent applies dynamics by making the impedance of the driving circuit dynamically adjustable rather than fixed. The driving circuit switches between a first impedance state (lower impedance) during charging/discharging operations and a second impedance state (higher impedance) during normal operation. This dynamic impedance adjustment reduces heat generation during high-current operations while maintaining circuit stability during normal operation, thus resolving the contradiction between heat reduction and circuit complexity.
2Manufacturing precision
If the pixel density is increased, then the display resolution is improved, but the heat generation cannot be ignored
Solution Approach 1:
The patent addresses the heat generation issue in high-density displays by dynamically adjusting the driving circuit's impedance based on operational demands. During charging and discharging phases when current demand is highest in high-density displays, the circuit switches to lower impedance to minimize I²R losses and heat generation. This allows high pixel density to be achieved without proportionally increasing heat problems.
3Use of energy by moving object
If the impedance is reduced during charging and discharging, then power consumption is reduced, but the control complexity increases
Solution Approach 1:
The patent employs feedback control through a detecting circuit that monitors the operational state of the display panel and automatically controls the switching between impedance states. The detecting circuit identifies when charging or discharging operations are needed and triggers the appropriate impedance state without requiring complex external control logic. This feedback mechanism reduces power consumption during high-current operations while keeping the control system relatively simple.
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 heat generation and power consumption during the charging and discharging processes without affecting the normal display operation, thereby improving the reliability and longevity of the driving circuit.
Implementation Method 1
The detecting circuit detects whether or not the charging circuit path or the discharging circuit path is in a first state of a charging/discharging stage or in a second state with voltage approaching to a stable state
Implementation Method 2
In a charging stage, a system high voltage VDD is received, and the pixel capacitor 116 is charged according to the input voltage Vin. A capacitance of the pixel capacitor 116 is represented by CP, which becomes stable after a period of time, and an output voltage Vout at an output terminal of the driving circuit 102 increases with time in the charging stage
Implementation Method 3
In a discharging stage, a ground voltage provides a discharging voltage
Implementation Method 4
Since the internal impedance of the driving circuit may have power consumption during a driving process, heat is generated
Data Source
AI summary
A driving circuit of flat display including a charging circuit path, a discharging circuit path, and a detecting circuit is provided. The charging circuit path has first and second impedance states, wherein an impedance value of the first impedance state is smaller than that of the second impedance state. The discharging circuit path has third and fourth impedance states, wherein an impedance value of the third impedance state is smaller than that of the fourth impedance state. The detecting circuit detects whether the charging circuit path or the discharging circuit path is in an unstable first state or stable second state, controls the charging circuit path to the first impedance state or the discharging circuit path to the third impedance state in the first state, and controls the charging circuit path to the second impedance state or the discharging circuit path to the fourth impedance state in the second state.