Driving IC for Electro-Optic Devices Using Differential Signaling
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Solution Overview
Problem
Existing driving integrated circuits for electro-optic devices, such as liquid crystal panels, face issues with noise susceptibility and increased terminal count due to the use of single-end serial interfaces for control signals, leading to erroneous operations and complex substrate design and production.
Innovation Solution
A driving integrated circuit design that incorporates differential receivers for pixel clocks and image signals, along with time-multiplexed differential receivers for control signals, to improve noise resistance and reduce terminal count by transmitting multiple control signals over fewer lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-end serial interface is used for control signals, then device complexity is reduced, but noise resistance deteriorates and erroneous operations occur
Solution Approach 1:
The patent changes the signaling parameter from single-end to differential signaling. The control circuit receives control signals through a differential interface instead of single-end interface, which fundamentally changes the electrical parameter of signal transmission. This differential signaling approach maintains terminal count while dramatically improving noise resistance and reliability, as differential signals are inherently more resistant to electromagnetic interference and ground potential differences.
2Ease of manufacture
If single-end serial interface is used for control signals, then ease of manufacture is improved, but manufacturing precision deteriorates due to noise-induced erroneous operations
Solution Approach 1:
The patent applies differential signaling parameter change to improve manufacturing precision. By using differential interface for control signals, the system becomes more robust against noise during operation, reducing erroneous operations that would otherwise require complex error correction and rework during manufacturing and testing phases.
3Reliability
If multiple separate control signal lines are used, then reliability is improved, but device complexity increases due to increased terminal count
Solution Approach 1:
The patent merges multiple control signals into a time-division multiplexed differential signal. Instead of using separate physical lines for each control signal, the control circuit receives multiple control signals through a single differential interface using time-division multiplexing. This combining approach maintains reliability by preserving signal integrity through differential signaling while reducing terminal count and device complexity.
Solution Approach 2:
The patent employs time-division multiplexing where control signals are transmitted periodically in time slots over the differential interface. The control circuit sequentially receives different control signals (such as vertical synchronization, horizontal synchronization, and other control parameters) in a periodic manner, allowing multiple signals to share the same physical medium without interference, thus reducing terminal count while maintaining reliability.
Data Source
AI summary
A first receiver receives a clock. A second receiver receives a differential type image signal. An image signal receiving unit performs sampling the differential type image signal by the clock, and generates an image signal driving an electro-optic device. A third receiver receives a time multiplexed control signal. A reception buffer performs sampling of the time multiplexed control signal by the clock and the stores the time multiplexed control signal. A driving control unit performs a driving control of the electro-optic device on the basis of the stored time multiplexed control signal.