Gate High Voltage Stabilizing Circuit for LCD
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing liquid crystal display devices face issues with variation in gate high voltage during the blanking period, leading to potential damage to the gate voltage modulating circuit, necessitating a low gate high voltage setting to prevent damage.
Innovation Solution
A gate high voltage generating circuit using multiple pumping units and a voltage stabilizing unit with a resistor and Zener diode in parallel, which superimposes the output voltage of the (n−1)th pumping unit on the Zener voltage to maintain the gate high voltage within a preset range, preventing excessive voltage rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the gate high voltage VGH is set to a high value, then the power supply efficiency is improved, but the gate high voltage varies during blanking period causing temporary rise that exceeds the highest preset value and damages the gate voltage modulating circuit
Solution Approach 1:
The voltage stabilizing unit is activated in advance during the blanking period to prevent voltage rise before it can damage the gate voltage modulating circuit. By preemptively clamping the voltage to the highest preset value, the system avoids the harmful effect while maintaining high power supply efficiency.
Solution Approach 2:
The voltage stabilizing unit acts as an intermediary between the gate high voltage generating circuit and the gate voltage modulating circuit. It intercepts and stabilizes the gate high voltage, preventing direct transmission of excessive voltage to the sensitive modulating circuit while allowing efficient power supply operation.
2Reliability
If the gate high voltage VGH is set low to prevent damage, then the circuit safety is improved, but the power supply efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts the gate high voltage level based on operational phase. During active display periods, the voltage operates at efficient high levels, while during blanking periods, the voltage stabilizing unit activates to clamp the voltage at the highest preset value, optimizing both efficiency and safety at different times.
3Illumination intensity
If the gate high voltage VGH is increased to improve display performance, then the display quality is improved, but the gate high voltage varies during blanking period causing temporary rise
Solution Approach 1:
The voltage stabilizing unit applies localized voltage clamping specifically during the blanking period when variation occurs, while allowing the gate high voltage to maintain higher efficient levels during active display periods. This localized intervention maintains display quality while preventing voltage instability.
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 allows for setting the gate high voltage within the desired range, preventing damage to the gate voltage modulating circuit and ensuring stable operation by controlling voltage fluctuations.
Implementation Method 1
a voltage stabilizing unit for generating a gate high voltage within a range of a highest preset value by using an output voltage of the (n−1)th pumping unit
Data Source
AI summary
Liquid crystal display device and method for driving the same, which has a gate high voltage generating circuit for preventing flickering of a gate high voltage. The liquid crystal display device includes a gate high voltage generating circuit for generating a gate high voltage by using n (where n is a natural number greater than unity) pumping units and supplying the gate high voltage through an output line, and a voltage stabilizing unit for generating a gate high voltage within a range of a highest preset value by using an output voltage of the (n−1)th pumping unit in a case the gate high voltage generated at the gate high voltage generating circuit exceeds the highest preset value.