Display Panel Sub-Frame Driving to Reduce Peak Current
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Solution Overview
Problem
Micro LED display panels face challenges with high peak current and fluctuating voltage due to simultaneous pixel activation, leading to increased power consumption and image quality deterioration.
Innovation Solution
A display panel design that alternates pixel activation in sub-frame periods using black grayscale voltage and data voltages, combined with a switch circuit to manage pixel groups, reducing peak current and optimizing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If all pixels are turned on and off simultaneously using duty driving technology, then power consumption is reduced at the same target brightness, but peak current flowing through the wiring lines increases
Solution Approach 1:
The pixel array is divided into multiple pixel groups (first pixel group, second pixel group, etc.), and each group is driven in separate sub-frame periods. This segmentation of the driving approach allows the peak current to be distributed across different time slots, preventing simultaneous switching of all pixels while maintaining the duty driving power savings.
2Productivity
If all pixels are turned on and off simultaneously, then duty driving efficiency is achieved, but voltage fluctuation due to IR drop deteriorates image quality
Solution Approach 1:
By segmenting the pixel array into multiple groups driven in different sub-frame periods, the current draw is distributed over time. This reduces the instantaneous IR drop across the power lines, stabilizing the voltage supplied to each pixel group during its active period and preventing image quality deterioration while preserving duty driving efficiency.
3Use of energy by moving object
If micro LED is driven with high current for short time, then luminous efficiency is maximized, but peak current constraints increase wiring and circuit design complexity
Solution Approach 1:
The pixel array is divided into multiple pixel groups that are activated in different sub-frame periods. This allows each pixel group to receive high current during its designated sub-frame, maximizing luminous efficiency, while the overall peak current is reduced compared to simultaneous activation of all pixels, simplifying wiring and circuit design constraints.
Data Source
AI summary
The present disclosure relates to a display panel and a display device including the same. The display panel may include: data lines of a first pixel group to which a first data voltage is applied during a first sub-frame period and then a black grayscale voltage is applied during a second sub-frame period; data lines of a second pixel group to which the black grayscale voltage is applied during the first sub-frame period and then a second data voltage is applied during the second sub-frame period; sub-pixels of the first pixel group connected to the data lines of the first pixel group; and sub-pixels of the second pixel group connected to the data lines of the second pixel group.