Electronic Paper Display Power Supply Circuit Integration
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Solution Overview
Problem
Current electronic paper display devices face challenges in reducing production costs and circuit layout space due to limited space for the driving circuit, which hinders integration with other functional circuits.
Innovation Solution
The integration of a level shifter within the power supply circuit allows direct signal output to the electronic paper display panel, reducing the need for external circuitry and saving space, while the placement of a timing controller can be either external or integrated depending on resolution requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate level shifter circuit is disposed outside the power supply circuit, then the driving signal can be properly level-shifted for the electronic paper display panel, but the circuit layout space increases and production costs increase
Solution Approach 1:
The level shifter circuit is merged with the power supply circuit to form an integrated power supply device. The level shifter includes a first voltage generator, second voltage generator, and capacitor connected to the power supply circuit, allowing the power supply circuit to directly output level-shifted driving signals to the electronic paper display panel without requiring external level shifter circuits, thereby reducing circuit layout space and production costs
2Ease of manufacture
If multiple separate circuits (power supply circuit, level shifter, timing controller) are disposed externally, then each circuit can be independently designed and optimized, but the circuit layout space increases and integration with other functional circuits becomes difficult
Solution Approach 1:
The power supply circuit and level shifter are merged into a single integrated power supply device that can be directly mounted on the display substrate. This integration maintains independent design capabilities for each functional block while enabling seamless integration with other functional circuits on the substrate, resolving the contradiction between independent design and integration capability
Solution Approach 2:
The integrated power supply device serves multiple functions: it generates power supply voltages, performs level shifting for driving signals, and can be directly mounted on the display substrate. This multi-functionality enhances adaptability and integration capability while maintaining ease of manufacture through modular design
3Reliability
If external circuits are used for power supply and signal driving, then circuit functionality is complete, but production costs increase due to additional components and assembly steps
Solution Approach 1:
The level shifter circuit is combined with the power supply circuit into a single integrated device, reducing the total number of discrete components. This merger maintains complete circuit functionality for power supply and signal level shifting while reducing production costs by eliminating separate components and simplifying assembly steps
Data Source
AI summary
An electronic paper display device including an electronic paper display substrate and a power supply circuit is provided. An electronic paper display panel and a driving circuit are disposed on the electronic paper display substrate. The power supply circuit is electrically connected to the electronic paper display panel and the driving circuit. The power supply circuit is configured to output a first driving signal to the electronic paper display panel and output a voltage signal to the driving circuit. The power supply circuit includes a level shifter. The power supply circuit outputs a first driving signal to the electronic paper display panel by utilizing the level shifter. The driving circuit includes a source driver. The driving circuit outputs a second driving signal to the electronic paper display panel according to the voltage signal by utilizing the source driver.