Display Device AC Voltage Compensation for Radiation and EMI
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Solution Overview
Problem
Existing display devices suffer from radiations and electromagnetic interference (EMI) due to parasitic capacitors on display area substrates caused by transitions in gate and source line signals, leading to interference in the common voltage.
Innovation Solution
Incorporating an AC voltage generator that generates an adjusting voltage based on driving current information of source and/or gate drivers to compensate the common voltage, using negative and positive pulses to counteract the interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate line signals and source line signals are applied to display area substrates, then the display device can operate normally, but radiations and electromagnetic interference occur due to parasitic capacitors
Solution Approach 1:
The patent applies preliminary anti-action by generating compensation signals before the harmful voltage fluctuations occur. The compensation signals are generated based on the transition statuses of gate and source line signals, and are applied to the common voltage lines in advance to counteract the harmful effects of parasitic capacitor discharge, thereby preventing radiation and EMI while maintaining normal display operation
Solution Approach 2:
The patent introduces an intermediary mechanism by adding compensation signal generation circuits that act as mediators between the gate/source line signals and the common voltage lines. These intermediary circuits detect the transition statuses and generate appropriate compensation signals to neutralize the harmful effects, thus protecting the system from radiation and EMI without affecting the primary display function
2Ease of operation
If common voltage is provided to display area substrates, then substrates can be driven, but voltage fluctuations occur due to parasitic capacitors during signal transitions
Solution Approach 1:
The patent implements feedback by monitoring the transition statuses of gate and source line signals and using this information to generate compensation signals. The compensation signals are fed back to the common voltage lines to counteract voltage fluctuations caused by parasitic capacitors, thereby maintaining voltage stability while preserving the ease of substrate driving
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the common voltage parameter based on the transition statuses of control signals. When transitions are detected, compensation signals modify the common voltage parameter to counteract fluctuations, thus maintaining voltage stability without compromising the driving functionality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces radiations and EMI on the display panel by stabilizing the common voltage, enhancing the EMI endurance of the display device.
Implementation Method 1
Radiations on the display panel 110 may be occurred by the rising edge and the failing edge, and Electromagnetic Interference (EMI) on the display device 100 can be occurred
Data Source
Figure 1A~1B
Figure 2A
Figure 2B~2C
AI summary
A display device includes a plurality of display area substrates, a common voltage generator and at least one AC voltage generator. The display area substrates are disposed in a display panel, wherein each of the display area substrates receives a gate line signal, a source line signal and a common voltage. The common voltage generator is coupled to the display area substrates for generating the common voltage to each of the display area substrates. The AC voltage generator is coupled to the common voltage generator, for generating an adjusting voltage to the common voltage according to driving current information of a plurality of source drivers of the display device, wherein the adjusting voltage has an AC voltage level.