Reflective Driving Backplate Overlap Layout to Reduce Mura

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Solution Overview

Problem

The exposure of gaps between the edges of electronic devices and the reflective layer in a direct type backlight module of LCD devices leads to issues such as Mura and light shadow, affecting product quality.

Innovation Solution

A driving backplate design with a reflective layer having overlapping parts corresponding to openings, where the orthogonal projection of these overlapping parts overlaps with the orthogonal projection of the electronic devices, reducing the exposed area and minimizing gaps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a reflective layer is provided to cover a surface of a substrate with electronic devices disposed on it, then light reflectivity is improved, but gaps between the edges of electronic devices and the reflective layer expose the substrate causing Mura and light shadow

Engineering Contradiction:

Improvelight reflectivityVSAvoidMura and light shadow

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

Instead of making the reflective layer smaller to fit around the electronic devices, the patent inverts the approach by making the reflective layer larger than the electronic devices. The reflective layer extends beyond the edges of the electronic devices, and its orthogonal projection completely covers the orthogonal projection of the electronic devices. This ensures that no substrate is exposed through gaps, eliminating Mura and light shadow effects while maintaining high light reflectivity.

Inventive Principle:

Principle #13The other way round (Inversion)

2Illumination intensity

If the reflective layer is made larger to cover more area, then light reflectivity is improved, but the exposed substrate area increases causing more Mura and light shadow

Engineering Contradiction:

Improvelight reflectivityVSAvoidexposed substrate area

Core Design Contradiction:

Illumination intensityVSArea of stationary object

Solution Approach 1:

The patent inverts the conventional design by making the reflective layer larger than the electronic devices rather than smaller. The reflective layer's orthogonal projection completely covers the orthogonal projection of the electronic devices, ensuring zero exposed substrate area. This eliminates the trade-off between reflectivity area and exposed substrate area, as the larger reflective layer design simultaneously achieves both high light reflectivity and zero exposed substrate.

Inventive Principle:

Principle #13The other way round (Inversion)

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 improves optical performance by reducing Mura and light shadow, enhancing the product quality of LCD devices.

Implementation Method 1

a reflective layer disposed on a side of the substrate, and including a plurality of openings

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS12481187B2Driving backplates including reflective layer having overlapping part, manufacturing methods thereof, and display devices

Publication Date: 2025.11.25 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

The present disclosure discloses a driving backplate, a manufacturing method thereof, and a display device. The driving backplate includes a substrate, a reflective layer disposed on a side of a substrate, and a plurality of electronic devices disposed on a side of the reflective layer away from the substrate; the reflective layer includes a plurality of openings, and includes a plurality of overlapping parts disposed adjacent to the openings and corresponding to the plurality of openings; and an orthogonal projection of each of the overlapping parts on a plane of the substrate overlaps with an orthogonal projection of a part of each of the electronic devices on the plane of the substrate.