Parallel Data Driver Amplifiers to Prevent Display Output Line Floating
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Solution Overview
Problem
Intermodulation noise is generated in the communication band of an antenna during the pre-charging period of amplifiers in a display device's data driver, particularly in electronic devices with short-range and long-range wireless communication capabilities.
Innovation Solution
The implementation of first and second amplifiers connected in parallel between channel and output lines, with transistors alternately turned on to maintain a continuous connection to the output lines, preventing a floating state and minimizing intermodulation noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single amplifier is used per channel in the data driver, then the device complexity is reduced, but intermodulation noise is generated in the communication band due to periodic floating of output lines during pre-charging
Solution Approach 1:
The amplifier is divided into multiple amplifiers (first amplifier and second amplifier) connected in parallel between the channel line and output line. These amplifiers alternately connect to the output line, ensuring continuous connection and preventing the output line from floating during pre-charging operations, thereby eliminating intermodulation noise while maintaining manageable device complexity
Solution Approach 2:
The multiple amplifiers alternately connect to the output line in a periodic manner. During each horizontal period, different amplifiers are activated in sequence, ensuring that at least one amplifier is always connected to the output line. This periodic switching prevents the output line from floating while maintaining signal integrity and reducing harmful noise
2Ease of manufacture
If the output line is set to floating state during amplifier pre-charging, then the pre-charging operation is simplified, but intermodulation noise is generated in the antenna communication band
Solution Approach 1:
Multiple amplifiers serve as intermediaries between the channel line and output line. During pre-charging of one amplifier, another amplifier remains connected to the output line, acting as a mediator that maintains continuous electrical connection. This eliminates the need to float the output line while still allowing pre-charging operations to proceed
Solution Approach 2:
The system is designed so that before one amplifier is pre-charged, another amplifier is already connected and ready to maintain the output line connection. This preliminary arrangement ensures that the output line never floats during pre-charging operations, preventing intermodulation noise while simplifying the pre-charging process
Data Source
AI summary
An embodiments of the present disclosure provides a display device including: pixels disposed to be connected to scan lines and data lines; and a data driver configured to supply a data signal to the data lines via output lines. The data driver includes: a signal generator configured to generate the data signal to supply the data signal to channel lines; and a first amplifier and a second amplifier connected in parallel between each of the channel lines and each of the output lines.