Display Driver Circuit I/O Voltage Adaptation
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Solution Overview
Problem
Current display driver integrated circuits (DDICs) have fixed operating voltages for their I/O interfaces, leading to poor compatibility and communication stability, especially with the varying voltage requirements of application processors and other integrated circuits.
Innovation Solution
A display driver circuit is designed with an I/O interface, internal circuit, push-pull circuit, and switching circuit, allowing for dual voltage transmission of 1.2 V and 1.8 V, as well as low voltage transmission of 0 V, to enhance compatibility and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed operating voltage is used for the I/O interface, then the circuit design is simplified, but the compatibility with different voltage requirements deteriorates
Solution Approach 1:
The I/O interface uses a dynamic voltage selection mechanism with switching circuits that can dynamically switch between 1.2V and 1.8V operating modes based on the connected device requirements. This allows the interface to adapt its voltage level dynamically rather than being fixed, resolving the contradiction between simplified design and voltage compatibility.
Solution Approach 2:
The patent implements variable voltage operation by changing the operating voltage parameter of the I/O interface between 1.2V and 1.8V depending on the connected device. This parameter change capability allows the same interface to work with different voltage requirements without requiring separate dedicated circuits for each voltage level.
2Adaptability or versatility
If separate circuits are designed for different voltage levels, then the voltage compatibility is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple voltage level handling capabilities into a single integrated I/O interface structure. Instead of having separate dedicated circuits for 1.2V and 1.8V operations, the design combines voltage selection, switching, and level translation functions into one unified interface that can handle both voltage levels through internal switching mechanisms.
Solution Approach 2:
The I/O interface is designed as a universal multi-functional unit that can operate with both 1.2V and 1.8V devices. The interface incorporates voltage selection circuits and switching mechanisms that enable it to perform multiple voltage level operations, eliminating the need for separate dedicated circuits for each voltage requirement.
3Adaptability or versatility
If the I/O interface supports multiple voltage levels, then the compatibility with different devices is improved, but the communication stability may deteriorate
Solution Approach 1:
The patent introduces voltage level translation circuits and buffering mechanisms as intermediary elements between the I/O interface and connected devices. These intermediary components ensure stable signal levels and proper voltage matching during communication, preventing signal integrity issues that could arise from direct multi-voltage level connections.
Solution Approach 2:
The design incorporates protection circuits and voltage clamping mechanisms that preemptively prevent voltage level conflicts and signal integrity issues. By providing beforehand cushioning through these protective elements, the system ensures communication stability even when switching between different voltage levels or connecting to devices with varying voltage requirements.
Data Source
AI summary
In a display driver circuit, a push-pull circuit is coupled to an internal circuit, a first external power terminal, a second external power terminal and a target node respectively, and can control the on-off of the first external power terminal, the second external power terminal and the target node in response to a target control signal transmitted by the internal circuit. The switching circuit is coupled to the target node and the I/O interface of the display driver circuit respectively, and can transmit an electric potential of the target node to the I/O interface of the display driver circuit, that is, a first power signal transmitted from the first external power terminal to the target node or a second power signal transmitted from the second external power terminal to the target node is further output to the I/O interface.