High Gate Voltage Generator PWM Boost Circuit Power Efficiency
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Solution Overview
Problem
Conventional high gate voltage generators in display modules require voltage-limiting devices to adjust voltage levels, leading to additional power consumption due to integral amplification of power voltage by charge pumps.
Innovation Solution
A high gate voltage generator incorporating a pulse width modulation (PWM) signal generating circuit, a boost circuit, and an amplifier circuit that adjusts the voltage level of the high gate voltage without a voltage-limiting device by setting the amplification multiple of internal elements, such as resistors, in the amplifier circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage-limiting device (e.g., Zener diode) is applied to adjust the voltage level of the high gate voltage, then the voltage level can be adjusted to comply with pixel electrical properties, but additional power consumption occurs
Solution Approach 1:
The patent changes the working parameters of the charge pump circuit by controlling the switching duty cycle of the PWM signal. By adjusting the duty cycle, the average output voltage is precisely controlled without requiring additional voltage-limiting devices, thus eliminating the extra power consumption associated with Zener diodes or other voltage regulation components.
Solution Approach 2:
The patent extracts and removes the voltage-limiting device from the system. Instead of using a Zener diode or other voltage regulation component to adjust the high gate voltage level, the invention uses a different approach (PWM-controlled charge pump) that achieves voltage adjustment without these additional components, thereby eliminating their power consumption.
2Power
If the charge pump integrally amplifies the power voltage, then the high gate voltage is generated, but the applicable voltage level is restricted
Solution Approach 1:
The patent introduces dynamic control to the charge pump circuit through PWM signal duty cycle adjustment. This allows the output voltage level to be dynamically adjusted to match different pixel electrical requirements, making the system adaptable to various voltage levels rather than being fixed at a single amplified voltage.
Solution Approach 2:
The patent makes the charge pump circuit universal by enabling it to output multiple voltage levels through PWM duty cycle control. The same circuit can serve different pixel types with different voltage requirements, eliminating the need for multiple dedicated voltage generation circuits for different voltage levels.
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 adjustable voltage levels of the high gate voltage without the need for voltage-limiting devices, thereby reducing additional power consumption and enhancing the efficiency of the display module.
Implementation Method 1
a boost circuit, and an amplifier circuit. The PWM signal generating circuit is used for outputting a PWM signal. The boost circuit is electrically connected to the PWM signal generating circuit and for receiving an input voltage to boost the input voltage
Implementation Method 2
The amplifier circuit is electrically connected to the boost circuit and for receiving a reference voltage to amplify the power voltage and then outputting a high gate voltage
Data Source
AI summary
A high gate voltage generator and a display module are provided. The high gate voltage generator includes a pulse width modulation (PWM) signal generating circuit, a boost circuit, and an amplifier circuit. The PWM signal generating circuit is used for outputting a PWM signal. The boost circuit is electrically connected to the PWM signal generating circuit and used for receiving an input voltage to boost the input voltage according to the PWM signal and then outputting a power voltage. The amplifier circuit is electrically connected to the boost circuit and used for receiving a reference voltage to amplify the power voltage and then outputting a high gate voltage. The reference voltage is greater than the high gate voltage and is provided by a backlight module electrically connected to the amplifier circuit.