Light-Emitting Substrate Layout for Uniform Mini LED Emission
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Solution Overview
Problem
The removal of diffusion film structures in display products using mini or micro LEDs leads to poor light uniformity due to inadequate dispersion of emitted light, resulting in optical defects and adverse impacts on display quality.
Innovation Solution
A light-emitting substrate design featuring a base substrate with light-emitting units arranged in staggered columns and zigzagging driving signal lines that form a grid-like structure, ensuring uniform light distribution by selectively passing or shielding light through the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If diffusion film structures are removed to simplify the display product structure, then device complexity is reduced, but light uniformity deteriorates due to inadequate dispersion of emitted light
Solution Approach 1:
The patent introduces a light shielding film as an intermediary element between the light-emitting units and the display surface. This film selectively blocks portions of the emitted light to compensate for the lack of dispersion from removed diffusion films, thereby maintaining light uniformity without adding complex diffusion structures. The light shielding film acts as a mediator that adjusts light distribution through strategic placement and pattern design.
Solution Approach 2:
The light shielding film is designed with spatially varying properties, including different shielding patterns, densities, and positions in different regions of the display. This local quality approach allows specific areas to have customized light blocking characteristics, compensating for the non-uniform light emission from mini/micro LEDs in different zones while maintaining overall light uniformity across the display surface.
2Manufacturing precision
If light-emitting units are arranged in a regular grid pattern to simplify manufacturing, then manufacturing precision is improved, but light uniformity deteriorates due to insufficient light dispersion
Solution Approach 1:
The patent employs asymmetric arrangements of light-emitting units and corresponding asymmetric patterns in the light shielding film. Rather than perfect symmetry, the design uses deliberate asymmetric positioning and spacing to optimize light distribution patterns, compensating for the limited dispersion capability of mini/micro LEDs while maintaining manufacturable precision.
Solution Approach 2:
Different regions of the light-emitting unit array and light shielding film have locally optimized characteristics. The spacing, positioning, and shielding patterns vary by region to account for differences in light emission characteristics, viewing angles, and display requirements, achieving overall uniformity through localized optimization rather than uniform design.
3Adaptability or versatility
If the number of driving signal lines is increased to provide individual control to each light-emitting unit, then adaptability is improved, but device complexity increases due to more wiring structures
Solution Approach 1:
The patent combines multiple driving signal lines into shared conductive structures and uses common electrode patterns that can be driven by single or few signal lines to control multiple light-emitting units. This merging approach reduces the total number of independent wiring structures while maintaining the ability to individually address and control each light-emitting unit through multiplexed driving schemes.
Solution Approach 2:
The driving signal lines and electrode structures are designed to serve multiple functions simultaneously. A single signal line can control multiple units at different times, and electrode patterns can serve both as driving electrodes and as part of the light shielding structure, reducing overall wiring complexity while maintaining control flexibility.
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 improves light uniformity by forming a uniform grid-like wiring structure, enhancing the overall display quality and reducing optical defects in display products.
Implementation Method 1
the light shielding film is configured to shield a central part of the light emitted from the light-emitting units
Data Source
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AI summary
A light-emitting substrate, a display apparatus, and an electronic device. The light-emitting substrate comprises a base substrate and light-emitting units and first driving signal line groups located on the base substrate; each light-emitting unit comprises a plurality of light-emitting sub-units, and each light-emitting sub-unit comprises a first electrode terminal and a second electrode terminal; a first driving signal line in each first driving signal line group is configured to be connected to the first electrode terminal of the corresponding light-emitting sub-unit; a k-th light-emitting unit in an N-th column and a k-th light-emitting unit in an (N+1)-th column relatively have a translation spacing in the column direction, the translation spacing is less than a spacing between two adjacent light-emitting units in a same column in the column direction, and N and k are both positive integers greater than 0; the first driving signal line groups are located between the N-th column of light-emitting units and the (N+1)-th column of light-emitting units, and extend in a zigzag manner along the column direction and alternately pass through the N-th column of light-emitting units and the (N+1)-th column of light-emitting units; each light-emitting unit allows passing of two adjacent first driving signal line groups. The light-emitting substrate can improve the uniformity of emergent light.