Display Data Driver Segmentation for Noise Reduction
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Solution Overview
Problem
The existing display apparatus experiences peak currents during each frame period, leading to driving noise, deteriorated display quality, and increased power consumption due to the rapid change of load caused by polarity inversion and voltage ripple in the vertical blank period.
Innovation Solution
The display apparatus turns on and off data driving blocks at different timings within the vertical blank period to minimize the change in load, using a driving controller to manage the operation of gate and data drivers, and includes digital to analog converters and output buffer switches to control data voltage levels, thereby reducing noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all data driving circuits are simultaneously turned on and off during the vertical blank period, then the operation is simple to control, but peak currents are generated causing driving noise, deteriorated display quality, and increased power consumption
Solution Approach 1:
The patent divides the data driving circuits into multiple groups (first group and second group) that are controlled independently. The first data driving circuits are turned off earlier than the second data driving circuits during the vertical blank period, creating a segmented switching strategy that distributes the load change over time and reduces peak current generation.
2Device complexity
If all data driving circuits are simultaneously turned on and off during the vertical blank period, then the control mechanism is simple, but voltage ripple occurs leading to deteriorated display quality
Solution Approach 1:
The patent segments the data driving circuits into multiple groups with different turn-off timings. The first data driving circuits are turned off at an earlier timing while the second data driving circuits are turned off at a later timing during the vertical blank period. This segmentation prevents simultaneous switching, thereby reducing voltage ripple and improving display quality without requiring complex control mechanisms.
3Device complexity
If all data driving circuits are simultaneously turned on and off during the vertical blank period, then the power management is simple, but power consumption increases due to peak currents
Solution Approach 1:
The patent implements segmented control where data driving circuits are divided into groups that are turned off at different timings during the vertical blank period. This segmentation avoids simultaneous switching of all circuits, thereby reducing peak current demand and lowering overall power consumption while maintaining relatively simple power management architecture.
4Object-generated harmful factors
If data driving circuits are turned off during the vertical blank period, then noise is reduced, but the turn-off timing must be precisely controlled to avoid affecting display performance
Solution Approach 1:
The patent divides data driving circuits into multiple groups with different turn-off timings during the vertical blank period. By segmenting the circuits and using relatively long turn-off periods for each group, the patent reduces noise while avoiding the need for extremely precise timing control. The segmented approach distributes the switching events, making timing precision more manageable.
Data Source
AI summary
A display apparatus includes a display panel, a gate driver and a data driver. The display panel displays an image. The gate driver outputs gate signals to the display panel. The data driver outputs data voltages to the display panel. The data driver includes a plurality of data driving circuits. At least two data driving circuits among the data driving circuits have different turn off timings or different turn on timings in a vertical blank period.