Display Panel Pseudo-Signal Line for Switching EMI Reduction
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Solution Overview
Problem
Existing display devices suffer from electromagnetic interference (EMI) during the display driving process, leading to noise and potential malfunction, which affects image quality and can shorten the lifespan of switching elements.
Innovation Solution
A display device and panel design that incorporates a pseudo signal line in the bezel area to counteract electromagnetic interference by applying a pseudo signal opposite in phase to the switching signals, reducing noise and overlapping toggling of switching elements, and utilizing a timing controller to manage switching signals to prevent simultaneous turn-on levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switching signal lines are used to transfer switching signals to control data voltage, then the display device can control multiple subpixels, but electromagnetic interference and noise increase
Solution Approach 1:
The patent merges multiple switching signal lines into a single shared signal line. Multiple subpixels share the same data voltage signal line, and switching signals are multiplexed through time-division multiplexing control. This reduces the number of physical signal lines, thereby reducing electromagnetic interference while maintaining the ability to control multiple subpixels through sequential switching control.
Solution Approach 2:
The patent employs periodic switching control where switching signals are applied in alternating periods to different subpixels. The switching elements are controlled to operate in non-overlapping time periods, creating a periodic action pattern that reduces simultaneous electromagnetic interference while maintaining control over multiple subpixels through time-division multiplexing.
2Speed
If switching elements are toggled frequently to control data voltage, then the display refresh rate increases, but the lifespan of switching elements decreases
Solution Approach 1:
The patent implements periodic switching control where switching elements are activated in alternating time periods rather than continuously toggled. Each switching element operates in non-overlapping periodic intervals, reducing the frequency of individual element toggling while maintaining the overall display refresh rate through coordinated periodic action across multiple elements.
Solution Approach 2:
The patent applies preliminary buffering control where switching signals include buffering periods that prevent immediate re-toggling of switching elements. By introducing predetermined time intervals and buffering periods in the switching signal timing, the patent reduces unnecessary frequent toggling of switching elements, thereby extending their operational lifespan while maintaining display performance.
3Speed
If switching signals are applied simultaneously to multiple signal lines, then the control speed increases, but noise and electromagnetic interference increase
Solution Approach 1:
The patent employs periodic time-division multiplexing where switching signals are applied sequentially in non-overlapping time periods rather than simultaneously. This periodic alternating control maintains high control speed through efficient time utilization while eliminating simultaneous signal switching that causes electromagnetic interference and noise.
Solution Approach 2:
The patent segments the switching control into distinct time periods for different subpixels or signal lines. By dividing the control timeline into separate segments where only one switching signal is active at a time, the patent prevents simultaneous switching noise while maintaining overall control speed through the coordinated segmentation of control operations.
Data Source
AI summary
A display device comprises a display panel including a plurality of subpixels in a display area and a plurality of switching signal lines and a pseudo signal line in a bezel area, a data switching circuit including a plurality of switching elements configured to control a data voltage supplied to the display panel, a timing controller configured to supply a plurality of switching signals controlling the plurality of switching elements through the plurality of switching signal lines, and a pseudo signal generation circuit configured to generate a pseudo signal supplied to the pseudo signal line using the plurality of switching signals.