Mini-LED Backlight Luminance Uniformity via Position-Based Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In active submillimeter light-emitting diode (Mini-LED) backlight modules, luminance differences between near-ends and far-ends of signal input terminals lead to display issues due to impedance-related waveform differences, affecting the display effect of larger backlight modules.
Innovation Solution
A light-emitting substrate and display device design that includes data lines, control signal lines, driving circuits with switching and driving transistors, and a control unit, where the durations of pre-set periods decrease from input terminals to the periphery, ensuring uniform light-emitting durations and luminance across the module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the backlight module size is increased, then the coverage area is improved, but the luminance difference between near-end and far-end increases
Solution Approach 1:
The patent applies local quality by differentiating the pre-set period durations for driving circuits based on their position relative to signal input terminals. Driving circuits closer to input terminals have longer pre-set periods, while those farther away have shorter pre-set periods. This position-dependent differentiation compensates for impedance-induced waveform differences across the module, ensuring uniform luminance output throughout the entire backlight module area.
2Reliability
If the line thickness is increased, then the impedance is reduced, but the space occupation increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the pre-set period duration parameter of driving circuits based on their position in the matrix. Instead of changing physical conductor dimensions, the system modifies the temporal parameter (pre-set period duration) to compensate for impedance effects. This allows maintaining signal transmission reliability without increasing conductor thickness or occupying additional space.
Data Source
AI summary
A light-emitting substrate and a display device are provided by the present application. The durations of pre-set periods of a plurality of driving circuits decrease along a direction from close to data signal input terminals to away from the data signal input terminals, and/or durations of the pre-set periods of the plurality of driving circuits decrease along a direction from close to first control signal input terminals to away from the first control signal input terminals, which the light-emitting luminance of the light-emitting elements at a near-end and far-end solving a display problem with the display device.