Configurable Source Driver Circuit for Display Afterimage Elimination
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Solution Overview
Problem
Current source drivers require multiple designs to address afterimage issues in different types of displays, as they need to be configured differently for power on and off states, lacking a universal solution.
Innovation Solution
A source driver design incorporating N output buffers, (N−1) switches, and three auxiliary switches that allow output terminals to be short-connected or connected to fixed voltages, enabling universal application across various display types by configuring endpoints to receive fixed voltages or float, thereby stabilizing capacitor potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple versions of source drivers are designed for different display types, then afterimage elimination is effective for each specific display type, but device complexity and manufacturing cost increase
Solution Approach 1:
The source driver is designed with a universal architecture that can adapt to different display types through configurable switch connections. The driver includes multiple switch groups (first, second, third switch groups) that can be configured in different states to match various display requirements, allowing a single driver design to serve multiple display types effectively without requiring multiple specialized versions
Solution Approach 2:
The source driver employs dynamically configurable switch networks that can change their connection states based on the display type. The switches can be controlled to connect output terminals to different reference voltages or to each other in different configurations, enabling the driver to adapt its behavior dynamically to eliminate afterimages across various display types without hardware changes
2Reliability
If output terminals are short-connected or connected to fixed voltage, then capacitor potentials are stabilized and afterimage is eliminated, but adaptability to different display types is reduced
Solution Approach 1:
The source driver uses controllable switches that can dynamically change the connection configuration of output terminals. During power-on or power-off states, the switches can be configured to short-connect terminals or connect them to fixed voltages as needed. This dynamic reconfiguration allows the same driver to adapt to different display types while maintaining capacitor potential stability for afterimage elimination
Solution Approach 2:
The source driver changes its electrical connection parameters (switch states) based on display type requirements. By controlling the switch groups to establish different connection topologies, the driver can adjust its output terminal configuration to match various display types, thereby maintaining both stability for afterimage elimination and adaptability to different applications
Data Source
AI summary
A source driver is proposed. The source driver includes N output buffers, (N−1) switches, a first auxiliary switch, a second auxiliary switch, and a third auxiliary switch. The (N−1) switches are respectively coupled between N output terminals of the N output buffers. The first auxiliary switch is coupled between a first output terminal among the N output terminals of the N output buffers and a first endpoint. The second auxiliary switch is coupled between the first output terminal and a second endpoint. The third auxiliary switch is coupled between the first output terminal and a third endpoint. Each of the first endpoint, the second endpoint, and the third endpoint receives a first fixed voltage, a second fixed voltage, a third fixed voltage, or is in a floating state.