LVDS Transmitter Current Control for Stable Signal Swing
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Solution Overview
Problem
Existing data transmitting devices for flat plate displays, such as LCDs and OLEDs, face issues with electromagnetic interference (EMI) and power consumption due to high data transmission frequencies, which are exacerbated by the need for option pins and variable resistances to control low voltage differential signals, leading to unstable device operation and increased production costs.
Innovation Solution
A data transmitting device comprising a current generator with parallel constant current sources and switches, a current amplifier, and a line driver that generates low voltage differential signals using a constant current, allowing for independent control of output currents to stabilize signal amplitude, and a reference voltage generator to produce a reference voltage for the line driver, eliminating the need for option pins and variable resistances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an option pin and variable resistance are used to control the amplitude of low voltage differential signals, then the signal amplitude can be adjusted, but the device complexity increases and production cost increases
Solution Approach 1:
The patent extracts the amplitude control function from external components (option pin and variable resistance) and integrates it into the LVDS transmitter circuit itself. The current generator internally adjusts the reference current to control output signal amplitude, eliminating the need for external amplitude control components and reducing device complexity.
Solution Approach 2:
The patent merges the amplitude control function with the existing LVDS transmitter circuit by integrating a current generator that internally adjusts reference current. This combines multiple functions (signal generation and amplitude control) into a single integrated circuit, reducing the need for separate external components.
2Adaptability or versatility
If an option pin and variable resistance are used to control the amplitude of low voltage differential signals, then the signal amplitude can be adjusted, but the production cost increases
Solution Approach 1:
The patent removes the need for external variable resistance and option pin connections from the manufacturing process. The amplitude control is achieved through internal circuitry that adjusts reference current, eliminating additional components that would increase production cost and assembly complexity.
Solution Approach 2:
The patent combines amplitude control functionality into the LVDS transmitter integrated circuit, eliminating the need for separate external components. This integration reduces component count, simplifies assembly, and lowers production costs while maintaining amplitude control capability.
3Ease of operation
If the option pin is floated due to contact failure of external variable resistance, then the device operation becomes unstable, but using external variable resistance increases device complexity
Solution Approach 1:
The patent implements self-service by making the LVDS transmitter internally adjust its output signal amplitude through the current generator. The circuit monitors and controls its own operation without requiring external variable resistance, eliminating contact failure issues and improving operational stability.
Solution Approach 2:
The patent extracts the unreliable external variable resistance and option pin from the system, replacing them with an internal current generator that provides stable amplitude control. This eliminates the source of contact failure and operational instability.
Data Source
AI summary
A data transmitting device and a flat plate display using the same are disclosed. The data transmitting device includes a current generator comprising a plurality of constant current sources connected in parallel and a plurality of switches connected to output terminals of the constant current sources, respectively, the current generator configured to switch the switches independently according to a preset digital current control signal and adding up the currents supplied from the constant current sources via the tuned-on switches to output; a current amplifier configured to amplify and output the output current of the current generator; and a line driver configured to generate and output a low voltage differential signal according to input data by using a constant current such as the amplified current of the current amplifier.