LCD Driving Circuit Reset Timing Control
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Solution Overview
Problem
LCD driving circuits experience unstable operations when reset signals are applied before the supply voltage reaches a sufficient level, leading to incorrect logic determination and potential abnormal operations.
Innovation Solution
A driving apparatus with a voltage generator and a reset signal generator that outputs a reset signal only after the internal supply voltage exceeds the external supply voltage during its rising period, ensuring stable voltage levels for circuit reset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the reset signal is applied to the driving circuits before the supply voltage reaches a sufficient voltage level, then the power-on reset can be triggered earlier, but the driving circuits perform unstable operation and logic determination becomes impossible
Solution Approach 1:
The reset signal generator monitors the internal supply voltage level and uses this feedback information to determine when to apply the reset signal. The generator compares the internal supply voltage against a reference threshold and only triggers the reset signal when the voltage reaches the sufficient level, ensuring reliable circuit operation while minimizing delay.
2Reliability
If the reset signal is applied after the supply voltage reaches a sufficient voltage level, then the driving circuits operate stably, but the reset timing is delayed
Solution Approach 1:
The reset signal generator is prepared in advance to monitor the internal supply voltage and is ready to trigger the reset signal immediately when the voltage reaches the sufficient level. This preliminary preparation ensures that the reset is applied at the earliest possible moment when stable operation is guaranteed, minimizing the delay while maintaining reliability.
3Power
If the voltage generator boosts the external supply voltage to generate internal supply voltage, then the driving circuits can operate with sufficient voltage level, but the reset timing must be coordinated with the voltage rising period
Solution Approach 1:
The reset signal generator uses the internal supply voltage itself as the trigger source for the reset signal. When the voltage generator boosts the external supply voltage to create the internal supply voltage, the rising edge of this internally-generated voltage automatically triggers the reset signal without requiring external control circuitry, simplifying the overall system while ensuring proper timing coordination.
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
Prevents abnormal operations by resetting the driving circuits only after the internal supply voltage reaches a stable level, ensuring reliable logic determination and operation.
Implementation Method 1
The voltage generator receives an external supply voltage and boosts the external supply voltage to output an internal supply voltage
Implementation Method 2
The reset signal generator receives the external supply voltage and the internal supply voltage and outputs a reset signal when the internal supply voltage exceeds the external supply voltage in a rising period of the internal supply voltage
Data Source
AI summary
A driving apparatus resets driving circuits provided therein after an internal supply voltage reaches a sufficient voltage level. The driving apparatus includes a reset signal generator that resets the driving circuits when the internal supply voltage exceeds the external supply voltage in a rising period of the internal supply voltage. Accordingly, the driving circuits may be prevented from being reset before the internal supply voltage reaches the sufficient voltage level, thereby preventing an abnormal operation of the driving circuits.