Pseudo Signal Generator Circuit for Display EMI Field Offsetting
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Solution Overview
Problem
Existing display apparatuses face issues with radiation mismatching due to load differences between shift registers and pseudo pattern parts, leading to electromagnetic interference (EMI) and inefficiencies in electric field management.
Innovation Solution
A display apparatus incorporating a pseudo signal generator that converts periodicity signals into current-type pseudo signals, inverts their phase, and sums them to offset electric fields, using current sensing and phase inverting circuits to minimize the bezel region and reduce EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pseudo signal generator is used, then the pseudo pattern part can be implemented, but radiation mismatching occurs due to load difference between shift register and pseudo pattern part
Solution Approach 1:
The patent introduces a pseudo signal generator as an intermediary component that includes a current mirror circuit. This circuit generates a pseudo signal current that mirrors the clock signal current, thereby matching the radiation characteristics between the shift register and pseudo pattern part despite load differences. The current mirror acts as a mediator that translates the clock signal into a compatible pseudo signal format.
2Object-affected harmful factors
If the pseudo pattern part is made larger to improve EMI offset, then electric field offset improves, but the bezel region area increases
Solution Approach 1:
The patent changes the parameter of the pseudo signal from voltage type to current type. By generating a current-type pseudo signal through the pseudo signal generator, the system achieves better EMI offset performance without requiring an increase in the pseudo pattern part area. This parameter change allows the same or better electromagnetic interference compensation with a smaller physical footprint.
3Reliability
If voltage-type pseudo signals are used, then the circuit implementation is simple, but robustness to noise and load differences is poor
Solution Approach 1:
The patent substitutes voltage-type signal generation with current-type signal generation. The pseudo signal generator uses a current mirror circuit that replicates the clock signal current characteristics, providing inherent noise immunity and load independence. This substitution replaces the simpler voltage-based approach with a current-based system that offers superior robustness against noise and load variations.
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
The solution enhances robustness to noise and load differences, minimizes electric fields causing EMI, and reduces the area occupied by pseudo pattern parts, thereby decreasing the bezel region of the display panel.
Implementation Method 1
a pseudo generator configured to sense the periodicity signal to convert it into a current and invert a phase to output as a pseudo signal of an inverted current type
Implementation Method 2
a pattern for offsetting an electric field generated from the periodicity signal, based on the pseudo signal
Data Source
AI summary
A display apparatus includes a display panel configured to display an image, a shift register configured to output a gate signal which is to be applied to the display panel, based on a periodicity signal output from a level shifter, a pseudo generator configured to sense the periodicity signal to convert it into a current and invert a phase to output as a pseudo signal of an inverted current type, and a pseudo pattern part disposed on the display panel, the pseudo pattern part including a pattern where the pseudo signal is applied.