Display Panel Data Driving to Reduce Power Voltage Fluctuation
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Solution Overview
Problem
Power voltage fluctuations in display panels due to coupling with data line voltage changes deteriorate display quality.
Innovation Solution
A display device with a data driver that applies data voltages to pixel-rows using alternating slew rates and output delays to distribute power load, reducing peak fluctuations and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data voltage is applied to all pixel-rows simultaneously, then data transmission efficiency is improved, but power voltage fluctuation increases
Solution Approach 1:
The display panel is divided into multiple pixel-row groups (first pixel-row group with odd-numbered rows and second pixel-row group with even-numbered rows). Data voltage is applied to these groups at different times in sequence, preventing simultaneous switching across the entire panel. This segmentation of the data application process distributes the power load over time, reducing peak power voltage fluctuations while maintaining complete data transmission coverage.
Solution Approach 2:
The data driver applies data voltage to pixel-row groups in periodic cycles, alternating between the first group (odd-numbered rows) and the second group (even-numbered rows). This periodic, alternating application pattern ensures that no two groups are activated simultaneously, creating a rhythmic distribution of power consumption that prevents voltage spikes while completing all data transmissions within a frame period.
2Speed
If data voltage changes are applied rapidly, then response speed is improved, but power voltage fluctuation increases
Solution Approach 1:
The rapid data voltage changes are segmented and distributed across different time periods. Instead of changing all data voltages simultaneously at full speed, the patent applies voltage changes to different pixel-row groups at different times. This temporal segmentation allows each group to experience rapid voltage transitions without causing simultaneous current spikes, thereby maintaining response speed while stabilizing power voltage.
Data Source
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AI summary
A display device (1) includes a display panel (100) including pixels (PX), a gate driver (300) configured to output a gate signal (GI, GW, GC, GB) to the pixels (PX), a data driver (500) configured to apply a data voltage (VDATA) to the display panel (100) and a driving controller (200) configured to control the gate driver (300) and the data driver (500). A time period in which the display panel is driven may include a first time period and a second time period . In the first time period, the first gate signal has an activation level, the second gate signal has an inactivation level, the first data voltage may have a first voltage level, and the second data voltage may have a third voltage level. In the second time period, the first gate signal may have an inactivation level, the second gate signal may have an activation level, the first data voltage may be changed to a second voltage level, and the second data voltage may have the third voltage level.