Light-Emitting Substrate Layout for Uniform Display Backlighting
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Solution Overview
Problem
Conventional display devices face challenges with light extraction efficiency due to the thickness and cost of back-light structures, particularly in large-size displays, where the use of diffusion sheets and Mini-LEDs requires a high number of light-emitting elements, limiting miniaturization and increasing costs.
Innovation Solution
A light-emitting substrate design featuring a drive circuit layer with crosswise wirings and reflective layers that form light transmittance regions, allowing for improved light distribution and reflection, reducing the need for diffusion sheets and minimizing the number of light-emitting elements, thereby enhancing light efficiency and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If diffusion sheets are used to homogenize light, then light uniformity is improved, but overall thickness of back-light structure increases
Solution Approach 1:
The patent removes the diffusion sheets from the back-light structure entirely. Instead of using diffusion sheets to achieve light uniformity, the invention uses a light transmittance region design in the drive circuit layer that inherently provides uniform light distribution without requiring additional diffusion components, thereby reducing overall thickness.
Solution Approach 2:
The drive circuit layer is designed to serve dual functions: electrical signal transmission and light uniformity control. By incorporating light transmittance regions into the drive circuit layer structure, the patent eliminates the need for separate diffusion sheets, as the drive circuit layer itself becomes responsible for both driving the light-emitting elements and ensuring uniform light output.
2Area of stationary object
If the number of light-emitting elements is increased to ensure light coverage, then light coverage is improved, but back-light cost increases significantly
Solution Approach 1:
The patent implements local quality by creating light transmittance regions at specific locations within the drive circuit layer. These localized transmittance regions allow light to pass through more efficiently at critical areas, improving overall light coverage and uniformity without requiring an increased number of light-emitting elements across the entire back-light structure.
3Ease of operation
If Mini-LED chips are used with high fineness of coverage, then regional lighting control is improved, but the quantity of chips needed increases due to small size
Solution Approach 1:
The patent merges the drive circuit layer with the light distribution function by integrating light transmittance regions directly into the drive circuit layer structure. This combination allows the same layer that controls the Mini-LED chips to also manage light distribution, reducing the need for additional components and minimizing the total quantity of chips required while maintaining regional lighting control capability.
4Illumination intensity
If more film structures are added to achieve high uniformity effect, then light uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the unnecessary film structures (diffusion sheets) from the back-light assembly. By using the light transmittance region design in the drive circuit layer, the invention achieves light uniformity without requiring multiple additional film layers, thereby simplifying the overall device structure and reducing 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
This design achieves uniform light emission with high efficiency, reducing the number of light-emitting elements and overall thickness, while maintaining high light uniformity and reducing costs, making it suitable for large-size display applications.
Implementation Method 1
the first reflective layer reflects at least part of light emitted by the light-emitting element to the first light-emitting sub-region; and the first reflective layer reflects light reflected by the drive circuit layer to the second light-emitting sub-region
Data Source
AI summary
Provided are a light-emitting substrate and a preparation method thereof, a light-emitting module, and a display module. The light-emitting substrate includes a substrate, a drive circuit layer located on a side of the substrate, at least one light-emitting element located on a side of the drive circuit layer away from the substrate, and a first reflective layer disposed on a side of the light-emitting element away from the substrate; the drive circuit layer includes multiple first wirings and second wirings which are disposed crosswise, and the first wirings and the second wirings form at least one light transmittance region.