Display Driver Circuit With Voltage Drop Suppression for E-Paper Colorization
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Solution Overview
Problem
The challenge is to reduce the high driving voltages required for colorization in electronic paper display devices, which increases circuit costs and is difficult to manufacture due to the need for transistors with high withstand voltages.
Innovation Solution
A driver circuit is designed with high-side and low-side voltage drop suppressor circuits, along with transistors and a control circuit. This configuration allows the voltage drop between input voltages and the output terminal to be divided, reducing the voltage across the transistors and enabling the use of transistors with lower withstand voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If transistors with high withstand voltages are used to achieve high driving voltages for colorization, then the optical properties of electronic paper display devices can be brought out, but circuit costs increase and manufacturing becomes difficult
Solution Approach 1:
The voltage drop suppression function is segmented into multiple circuits: high-side voltage drop suppressor circuit and low-side voltage drop suppressor circuit. Each circuit handles a portion of the voltage regulation task, allowing the use of transistors with lower withstand voltages while still achieving the required high driving voltages for colorization.
Solution Approach 2:
The voltage drop suppressor circuits act as intermediary components between the power supply and the transistors. These circuits include compensation transistors and voltage regulation elements that mediate the voltage distribution, protecting the main transistors from excessive voltage stress while enabling high driving voltages.
2Strength
If transistors with high withstand voltages are disposed in electronic paper display devices, then high driving voltages can be achieved for colorization, but circuit costs increase
Solution Approach 1:
The voltage regulation function is divided into multiple segments: high-side voltage drop suppressor circuit with compensation transistor, low-side voltage drop suppressor circuit with compensation transistor, and main drive transistors. This segmentation allows each component to be optimized for lower voltage ratings, reducing overall circuit cost while maintaining high driving voltage capability.
Solution Approach 2:
The circuit dynamically adjusts voltage distribution parameters through compensation transistors and control circuits. By changing the voltage drop allocation between different circuit segments, the system achieves high driving voltages without requiring individual transistors to withstand the full voltage, thereby reducing component costs.
3Strength
If voltage drop across transistors is reduced through voltage drop suppressor circuits, then transistors with lower withstand voltages can be used, but circuit structure becomes more complex
Solution Approach 1:
The circuit structure is segmented into functional modules: high-side voltage drop suppressor circuit, low-side voltage drop suppressor circuit, compensation circuits, and control circuits. Each module has a specific function and can be independently designed and optimized, making the overall complex structure more manageable and maintainable.
Solution Approach 2:
The voltage drop suppressor circuits serve multiple functions: voltage regulation, transistor protection, and enabling high driving voltages for colorization. By designing these circuits to perform multiple functions, the patent reduces the need for separate dedicated components, thereby managing circuit complexity while achieving the desired voltage protection.
Data Source
AI summary
A driver circuit of a display device is provided. The driver circuit includes a high-side transistor, a high-side voltage drop suppressor circuit, a low-side transistor, a low-side voltage drop suppressor circuit and a control circuit. When the driver circuit supplies power supplies power generated from a high-side input voltage, the control circuit turns on the high-side voltage drop suppressor circuit for reducing a voltage drop across a first terminal and a second terminal of the high-side transistor. When the driver circuit supplies power generated from a low-side input voltage, the control circuit turns on the low-side voltage drop suppressor circuit for reducing a voltage drop across a first terminal and a second terminal of the low-side transistor.