Display Device Channel Grouping for Noise Reduction
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Solution Overview
Problem
Display devices experience sound noise due to drastic changes in current during the transition between active and blank periods, causing components to vibrate and generate noise.
Innovation Solution
The display device groups its channels into multiple channel groups, which sequentially initiate and finish dummy data voltage output operations in a specific order during blank periods before and after the active period, gradually increasing and decreasing the current to prevent sudden changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data driver outputs data voltages to all channels simultaneously during the active period, then the display performance is improved, but the current changes drastically causing sound noise
Solution Approach 1:
The patent divides the channel groups into multiple segments (first through N-th channel groups) and assigns different sequential orders for initiating and finishing dummy data voltage output operations. This segmentation allows current to change gradually across segments rather than all at once, reducing sound noise while maintaining display performance during active periods.
Solution Approach 2:
The patent performs preliminary dummy data voltage output operations during the blank period before the active period. The first channel group initiates dummy data voltage output first, followed by subsequent channel groups in sequence. This preliminary action prepares the current flow gradually, preventing drastic current changes when transitioning to active period, thereby reducing sound noise.
2Loss of energy
If the data driver stops outputting data voltages during the blank period, then power consumption is reduced, but the current changes drastically causing components to vibrate
Solution Approach 1:
The patent performs preliminary dummy data voltage output operations during the blank period before the active period, where channel groups sequentially initiate and finish operations in a first order. This gradual current transition prevents drastic changes, reducing vibration and sound noise while maintaining lower power consumption during the blank period compared to continuous active output.
Solution Approach 2:
The patent implements periodic dummy data voltage output operations during blank periods, with channel groups sequentially initiating operations in a first order before the active period and sequentially finishing operations in a second order after the active period. This periodic action maintains controlled current flow during blank periods, preventing vibration while managing power consumption.
3Ease of operation
If the data driver outputs black data voltage to all channels simultaneously during blank period, then the transition is simple to control, but the current changes drastically causing sound noise
Solution Approach 1:
The patent segments the channel groups into multiple groups and assigns different sequential orders for dummy data voltage output operations. Instead of simultaneous black data voltage output to all channels, the system sequentially initiates and finishes operations across channel groups, maintaining control simplicity while preventing drastic current changes that cause sound noise.
Data Source
AI summary
A display device includes a display panel including a plurality of data lines, and a plurality of pixels coupled to the plurality of data lines, a data driver including a plurality of channels providing data voltages to the plurality of pixels through the plurality of data lines, and a controller configured to control the data driver. The plurality of channels is grouped into first through N-th channel groups, where N is an integer greater than 1. The first through N-th channel groups sequentially initiate first dummy data voltage output operations in a first order from the first channel group to the N-th channel group in a first blank period before an active period, and sequentially finish second dummy data voltage output operations in a second order from the N-th channel group to the first channel group in a second blank period after the active period.