Light-Emitting Substrate Layout for Uniform Mini LED Brightness
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Solution Overview
Problem
The direct-type mini/micro LED light sources in display devices experience uneven brightness due to voltage differences between the positive and negative poles of LEDs, leading to current differences and non-uniform brightness.
Innovation Solution
A light-emitting substrate design with multiple light-emitting control units divided into areas, where sub-units are connected to different positive voltage lines, and symmetrically arranged positive voltage lines with varying resistances to reduce IR drops, ensuring uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single positive voltage line is used to drive all sub-light-emitting units, then the device complexity is reduced, but the brightness uniformity deteriorates due to voltage differences and current differences across different positions
Solution Approach 1:
The patent divides the light-emitting area into multiple regions, with each region driven by a separate positive voltage line. This segmentation reduces the length of each voltage line and minimizes voltage drops, thereby improving brightness uniformity across the display while maintaining manageable device complexity through systematic regional division.
2Area of stationary object
If the length of positive voltage lines is increased to cover the entire light-emitting area, then all sub-units can be driven, but the voltage drop increases causing non-uniform brightness
Solution Approach 1:
The patent segments the light-emitting area into multiple regions, each served by a separate positive voltage line. This reduces the length of individual voltage lines, thereby minimizing voltage drops and energy losses while still achieving comprehensive coverage of the entire display area through the combined network of segmented lines.
3Illumination intensity
If the width of positive voltage lines is increased to reduce resistance, then the voltage drop is reduced improving brightness uniformity, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies different line widths to different positive voltage lines based on their specific requirements. Lines serving regions with higher current demands or longer lengths are designed with greater widths to reduce resistance, while lines with lower demands use narrower widths. This localized optimization achieves brightness uniformity without uniformly increasing device complexity.
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 design effectively reduces positive IR drops, resulting in uniform luminous brightness across the display device by halving the number of sub-units driven by each positive voltage line, improving brightness uniformity and reducing power consumption.
Implementation Method 1
each positive voltage line has a same resistance value
Implementation Method 2
the voltage difference between the positive and negative poles of two LEDs will cause a current difference, then lead to a brightness difference
Data Source
AI summary
Provided in embodiments of the disclosure are a light-emitting substrate and a display device. The light-emitting substrate has a light-emitting area and a peripheral area arranged around the light-emitting area, and the light-emitting substrate includes: a plurality of light-emitting control units distributed in an array in the light-emitting area; wherein each of the light-emitting control units includes at least one sub-light-emitting unit, and the plurality of light-emitting control units are divided into at least two areas; at least two positive voltage lines located in the peripheral area and respectively located on opposite sides of the plurality of light-emitting control units; wherein sub-light-emitting units of light-emitting control units in a same area are electrically connected to a same positive voltage line, and sub-light-emitting units of light-emitting control units in different areas are electrically connected to different positive voltage lines.