EDP MIPI DSI Combination Driver Circuit Architecture
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Solution Overview
Problem
Integrated circuit designers face inefficiencies in silicon die real estate and I/O count due to the need to incorporate multiple display interfaces like Display Port, embedded Display Port, HDMI, and MIPI DSI, which requires separate custom circuits for each, leading to increased silicon die consumption and pin count.
Innovation Solution
A combination driver circuit that shares transistors and optimizes area and pin count by using thin gate transistors for high-speed interfaces and thick gate transistors for low-power interfaces, allowing for a single I/O to support multiple standards through transistor sharing and protective circuits to prevent dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate custom circuits are incorporated for each display interface standard, then each interface can operate independently and reliably, but the silicon die area consumption increases significantly
Solution Approach 1:
The patent implements a universal driver circuit that can operate with multiple display interface standards (eDP and MIPI DSI) through a single I/O interface. The driver circuit is designed to be reconfigurable, supporting different signaling protocols and electrical characteristics without requiring separate dedicated circuits for each standard, thereby reducing silicon die area while maintaining interface reliability
Solution Approach 2:
The patent merges the functionality of separate eDP and MIPI DSI driver circuits into a single combined driver circuit. This integration allows both interface standards to share common circuitry including the output driver, I/O interface, and control logic, eliminating redundant components and reducing overall silicon die area consumption
2Adaptability or versatility
If separate custom circuits are incorporated for each display interface standard, then each interface can be optimized for its specific requirements, but the I/O count increases prohibitively
Solution Approach 1:
The driver circuit is designed as a universal interface that can accommodate multiple display standards (eDP and MIPI DSI) through a single I/O connection. The circuit includes reconfigurable elements that can be programmed or controlled to match the electrical and signaling requirements of different standards, eliminating the need for multiple separate I/O interfaces
Solution Approach 2:
The patent employs dynamic reconfiguration capabilities in the driver circuit, allowing it to adapt its electrical characteristics, signaling mode, and operational parameters based on which display interface standard is currently active. This dynamic adaptability enables a single static I/O interface to serve multiple functional purposes
3Area of stationary object
If transistor sharing is implemented between high-speed and low-power drivers, then silicon die area is reduced, but dielectric breakdown risk increases
Solution Approach 1:
The patent applies different transistor gate dielectric thicknesses to different operational modes within the same driver circuit. Thick gate dielectric transistors are used for low-power MIPI DSI operations to prevent breakdown, while thin gate dielectric transistors are used for high-speed eDP operations where higher voltage swings are acceptable. This local differentiation of transistor characteristics allows area-efficient sharing while maintaining reliability for each specific operation
Data Source
AI summary
An integrated circuit is described. The integrated circuit includes a display controller having a driver. The display controller is configurable to select two or more display interfaces. The driver is designed to drive respective signals for the two or more display interfaces through a single output.