Micro-LED Subframe Driving for Low-Luminance Uniformity
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Solution Overview
Problem
Micro-LED display panels face efficiency and uniformity issues when adjusting luminance from high to low modes due to traditional luminance adjustment methods that reduce current density, affecting their performance.
Innovation Solution
A driving method for Micro-LED display panels that adjusts luminance by controlling the duration of luminescence stages and subframes, rather than solely reducing instantaneous luminance, ensuring high uniformity and efficiency by maintaining current density within optimal ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional luminance adjustment methods are used to reduce luminance from high to low modes, then luminance is adjusted, but efficiency and uniformity deteriorate due to reduced current density
Solution Approach 1:
The frame is divided into multiple subframes (first subframe, second subframe, third subframe) with different luminescence durations. By segmenting the display period, the patent achieves luminance adjustment without uniformly reducing current density, thus maintaining efficiency and uniformity while achieving the desired luminance reduction.
Solution Approach 2:
The patent dynamically adjusts the luminescence duration of different subframes based on the required luminance level. In high-luminance mode, all subframes have full luminescence duration, while in low-luminance mode, the luminescence duration is reduced for all subframes or selectively applied, enabling flexible luminance control without compromising efficiency.
2Illumination intensity
If traditional luminance adjustment methods are used to reduce luminance from high to low modes, then luminance is adjusted, but uniformity deteriorates due to reduced current density
Solution Approach 1:
By dividing the frame into multiple subframes with different luminescence durations, the patent maintains uniform current density distribution across different regions. This segmentation approach allows luminance adjustment through temporal control rather than spatial variation in current density, preserving uniformity.
Solution Approach 2:
The patent uses periodic luminescence control across multiple subframes to achieve luminance adjustment. By applying periodic luminescence duration adjustments rather than continuous current density reduction, the system maintains uniformity while achieving the desired luminance level.
3Illumination intensity
If luminance is adjusted by reducing subframe count and luminescence duration, then luminance uniformity and efficiency are maintained, but display duration is reduced
Solution Approach 1:
The patent dynamically adjusts the luminescence duration of subframes based on the required luminance level. In low-luminance mode, the luminescence duration is reduced for all subframes or selectively applied, enabling flexible luminance control while maintaining the total display duration through dynamic timing adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method maintains high luminance uniformity and efficiency by reducing luminescence duration and subframe count, rather than current density, thereby enhancing display performance across varying luminance modes.
Implementation Method 1
A Micro-light-emitting diode (Micro-LED) has characteristics of miniaturization, high photoelectric conversion efficiency, and short response time
Implementation Method 2
the first driving circuit is configured to control a duration of providing a driving current to the light emitting device based on a first data voltage
Data Source
AI summary
Driving method of display panel and display device are provided. The display panel includes a plurality of light-emitting devices and a plurality of pixel circuits. A frame of the display panel including at least one subframe. A working process of a pixel circuit of the plurality of pixel circuits in a subframe of the at least one subframe includes a luminescence stage. The display panel includes a first luminance mode and a second luminance mode. The driving method includes that in both the first luminance mode and the second luminance mode, a light-emitting device of the plurality of light-emitting devices is controlled to display gray levels according to an instantaneous luminance allocation rule for a subframe. A maximum duration of the luminescence stage in subframes in the first luminance mode is greater than a maximum duration of the luminescence stage in subframes in the second luminance mode.