Display Panel Clock Pseudo Lines for EMI Cancellation
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Solution Overview
Problem
Electromagnetic interference (EMI) caused by signals in display devices affects the performance of display devices, such as LCD and OLED devices, due to noise generated by clock and multiplexer control signals.
Innovation Solution
Incorporation of clock pseudo lines and MUX pseudo lines in the non-display area of the display panel, with phases inverted from the clock and MUX control signals, to cancel electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signal and MUX control signal are supplied to drive the display device, then the display device can operate normally, but electromagnetic interference is generated affecting display performance
Solution Approach 1:
The patent applies preliminary anti-action by introducing clock pseudo signals and MUX pseudo signals that are phase-inverted versions of the original clock and MUX control signals. These pseudo signals are supplied through dedicated pseudo lines to the gate driver in advance, creating electromagnetic waves that destructively interfere with the harmful electromagnetic interference generated by the original signals, thereby preventing display performance degradation before it occurs.
Solution Approach 2:
The patent converts the harmful electromagnetic interference into a beneficial effect by utilizing the phase-inverted pseudo signals to generate electromagnetic waves that cancel out the interference. The harmful electromagnetic waves from the clock and MUX control signals are transformed into useful cancellation waves through the pseudo signal generation mechanism, where the same signal paths and components that cause interference are repurposed to eliminate that interference.
2Object-generated harmful factors
If clock pseudo line and MUX pseudo line are added to cancel electromagnetic interference, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent merges the functionality of signal transmission and interference cancellation by integrating the pseudo signal generation within the existing data driver and gate driver structures. The clock pseudo signal and MUX pseudo signal are generated using the same signal paths and components that carry the original signals, combining multiple functions into unified signal transmission lines that serve both driving and interference cancellation purposes.
Solution Approach 2:
The patent implements self-service by enabling the display device to generate its own counteracting pseudo signals using its internal signal processing capabilities. The data driver generates phase-inverted pseudo signals from the original clock and MUX control signals, and the gate driver receives and utilizes these pseudo signals through dedicated pseudo lines, allowing the system to self-correct its electromagnetic interference without external intervention.
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
Effectively removes electromagnetic interference by canceling electromagnetic waves generated by clock and MUX control signals, thereby improving system stability and display performance.
Implementation Method 1
an electromagnetic wave of a clock signal is completely cancelled by a clock pseudo signal so that the electromagnetic interference by the clock signal can be effectively removed
Implementation Method 2
an electromagnetic wave of a multiplexer (MUX) control signal is completely cancelled by a MUX pseudo signal so that the electromagnetic interference by the MUX control signal can be effectively removed
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes a display panel having a display area and a non-display area adjacent to the display area, where the display area includes a plurality of pixels. The display device further includes a gate driver disposed in the non-display area of the display panel and configured to supply a gate signal to the plurality of pixels, and a data driver configured to supply a data voltage to the plurality of pixels and configured to supply a clock signal to the gate driver through a clock line. The display device also includes a clock pseudo line disposed in the non-display area of the display panel and applied with a clock pseudo signal with a phase inverted from a phase of the clock signal. By this configuration, the electromagnetic interference by the clock signal cancan be effectively removed or minimized.


