Gate Driver Circuit Residual Image Elimination
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Solution Overview
Problem
Conventional gate driver circuits for display devices require additional controlling ICs and a microprocessor to extend the shutdown sequence of driving sources, increasing production costs and complexity to eliminate residual images due to lingering electric charges.
Innovation Solution
A gate driver circuit incorporating a first capacitor to filter high frequency surges, a diode to charge a second capacitor, and a regulator circuit to extend the power source (VDD) during shutdown, eliminating the need for additional controllers and microprocessors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional controlling ICs and microprocessor are used to extend shutdown sequence, then residual image elimination is improved, but device complexity and production cost increase
Solution Approach 1:
The patent extracts and eliminates the need for complex controlling ICs and microprocessors by using a simple capacitor-based circuit to extend the shutdown sequence. The capacitor naturally maintains voltage during the transition period, providing residual image elimination without requiring additional complex control components.
Solution Approach 2:
The patent replaces expensive controlling ICs and microprocessors with inexpensive passive components (capacitors and resistors). The simple RC circuit provides the necessary voltage extension function at minimal cost, making the solution economically viable for mass production.
2Reliability
If additional controlling ICs and microprocessor are used to extend shutdown sequence, then residual image elimination is improved, but production cost increases
Solution Approach 1:
The patent uses inexpensive passive components (capacitors and resistors) instead of expensive active controlling components. The RC circuit provides the necessary voltage extension function at minimal cost, significantly reducing production costs while maintaining effectiveness in residual image elimination.
3Reliability
If shutdown sequence is extended using conventional method, then residual charges are discharged, but thin film transistors remain on longer causing residual image
Solution Approach 1:
The capacitor is pre-charged during the normal operating phase and automatically discharges during the shutdown phase, extending the voltage supply to keep thin film transistors in the on-state longer. This preliminary charging action ensures that residual charges are properly discharged without causing persistent residual images.
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 solution reduces production costs by eliminating the need for extra ICs and microprocessors while effectively discharging residual images from display devices by maintaining the thin film transistors in an on-state longer during shutdown.
Implementation Method 1
A first capacitor is used for filtering out high frequency surge and high frequency noise of an input voltage
Implementation Method 2
The diode receives the input voltage and charges up the second capacitor by forwarding charges to the second capacitor
Data Source
AI summary
A gate driver circuit for eliminating power-off residual image form a display device is provided. The gate driver circuit comprises a first capacitor, a diode, a second capacitor and a regulator circuit. The first capacitor filters out high frequency surge and high frequency noise of an input voltage. The diode receives the input voltage and charges up the second capacitor by forwarding charges to the second capacitor. The diode also provides an input voltage to the regulator circuit. Finally, the voltage level transformer of the regulator circuit transmits an output voltage to the logic circuit of the display device.