Inverted Signal Display Device EMI Reduction
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Solution Overview
Problem
Existing display devices face challenges in reducing electromagnetic interference (EMI) and noise on signal lines, particularly due to the requirement for additional signal lines and incompatibility with certain display technologies like OLEDs, limiting the applicability of field cancelation techniques.
Innovation Solution
A display device and method utilizing a signal inversion circuit to generate three-step signals with opposite phases, including a positive polarity voltage, a reference level voltage, and a negative polarity voltage, which are applied to signal lines to minimize EMI and noise without increasing the number of lines, and a recovery circuit to convert these signals back to a two-step output for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If field cancelation technique is used to reduce EMI, then electromagnetic interference is reduced, but additional signal lines are required and device complexity increases
Solution Approach 1:
The patent inverts the conventional field cancelation approach by using a single signal line that transmits inverted signals (active low logic) instead of adding complementary signal lines. The inversion circuit generates inverted gate signals that reduce EMI through phase cancellation while maintaining compatibility with existing display panel structures and avoiding additional wiring complexity.
2Object-affected harmful factors
If field cancelation technique is used to reduce EMI, then electromagnetic interference is reduced, but the technique cannot be applied to OLED display devices
Solution Approach 1:
The patent adapts the field cancelation technique to OLED displays by changing the signal inversion mechanism to match OLED driving characteristics. The inversion circuit is configured to generate inverted signals compatible with OLED pixel driving requirements, enabling EMI reduction without sacrificing display technology compatibility.
3Object-affected harmful factors
If inverted signals are used to reduce EMI, then electromagnetic interference is reduced, but transistor gate bias stress increases
Solution Approach 1:
The patent applies periodic inversion of gate signals to reduce EMI while managing gate bias stress. The inversion circuit periodically inverts the gate signals according to the display scanning sequence, creating alternating positive and negative polarity voltages that cancel EMI fields. This periodic inversion pattern allows the transistor gates to experience balanced stress over time while achieving EMI reduction.
Data Source
AI summary
Disclosed are a display device using an inverted signal and a driving method thereof. The display device includes a display panel driving circuit for writing data to pixels, a signal generation unit configured to generate a two-step signal for controlling the display panel driving circuit; a plurality of signal lines configured to connect the display panel driving circuit to the signal generation unit; and a signal inversion circuit configured to receive a two-step signal from the signal generation unit, invert the two-step signal, and supply three-step signals each including a positive polarity voltage, a reference level voltage, and a negative polarity voltage to the signal lines.