Mini-LED Driving Method for Grayscale Fineness
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Solution Overview
Problem
Conventional mini-LED display panels rely on high currents and low duty cycles for low grayscale display, resulting in low utilization rates and loss of detail due to limited PWM dimming frequencies, typically achieving only 20% to 40% actual utilization.
Innovation Solution
A driving method for display panels that involves obtaining grayscale data, determining target current levels, and generating pulse width modulation signals to drive light-emitting elements, allowing for finer control of grayscale levels by using different current levels for various grayscales, improving the display of low grayscales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high currents and low duty cycles are used for low grayscale display, then the display panel can achieve low grayscale display functions, but the actual utilization rate is low (20% to 40%) and details of low grayscales are lost
Solution Approach 1:
The patent introduces multiple current levels (first current level and second current level) to replace the conventional single high current approach. By switching between different current levels based on grayscale requirements, the system achieves low grayscale display with higher utilization rates while preserving detail information.
2Illumination intensity
If PWM dimming frequencies are high, then the display panel can achieve low grayscale display functions, but the actual utilization rate is only 20% to 40%, causing loss of details
Solution Approach 1:
The patent segments the grayscale control into multiple current levels rather than relying solely on PWM duty cycle modulation. This segmentation allows for more precise control of low grayscale values, preserving detail information that would otherwise be lost in conventional PWM-only approaches.
3Device complexity
If a single current is used in mini-LED driving chip, then the device structure is simple, but the fineness of grayscale images is limited
Solution Approach 1:
The driving chip is designed to output multiple current levels (first current level and second current level) through the same output terminal. This multi-functional capability allows a single chip to achieve fine grayscale control without requiring multiple separate current sources, maintaining structural simplicity while improving image fineness.
Data Source
AI summary
The present application provides a driving method, a driving device, and a display terminal of a display panel. The display panel includes light emitting elements. The driving method includes: obtaining a grayscale data of a displayed image; determining a target current level from preset multiple current levels according to the grayscale data; determining a pulse width modulation signal according to the grayscale data; and driving the light emitting elements to emit light according to the target current level and the pulse width modulation signal.