Reflective Plate Structure for Higher-Brightness Display Panels

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Solution Overview

Problem

Existing display devices face challenges in achieving high front brightness and minimizing brightness deviation across viewing angles due to inefficient light extraction and reflection.

Innovation Solution

The display device incorporates a substrate with closed curve patterns disposed below a reflective plate, where the patterns have inclined surfaces to improve light extraction efficiency and front brightness. The reflective plate has a concave-convex shape corresponding to the patterns, and the inclination angles of the patterns are adjusted to match the brightness distribution of the light-emitting element.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a conventional flat reflective plate is used, then the structure is simple, but light extraction efficiency is low and front brightness is insufficient

Engineering Contradiction:

Improvefront brightnessVSAvoidstructure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The reflective plate is designed with a concave-convex shape featuring multiple inclined surfaces instead of a flat surface. These inclined surfaces are configured at specific angles to reflect light toward the front, improving light extraction efficiency and front brightness while maintaining reasonable structural complexity

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The reflective plate is divided into multiple inclined surfaces (first, second, third, and fourth inclined surfaces) with different orientations. Each surface segment reflects light in specific directions to optimize front brightness and reduce viewing angle dependence, transforming a single flat surface into a multi-faceted structure

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If light is emitted in multiple directions, then the light distribution is broad, but brightness deviation across viewing angles increases

Engineering Contradiction:

Improveviewing angle coverageVSAvoidbrightness uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Different inclined surfaces of the reflective plate are configured with specific inclination angles tailored to their local positions. The first and second inclined surfaces have different angles from the third and fourth inclined surfaces, optimizing light reflection for different viewing directions while maintaining overall brightness uniformity across viewing angles

Inventive Principle:

Principle #3Local quality

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 configuration enhances front brightness and reduces brightness deviation across viewing angles by effectively extracting and reflecting light towards the front surface, resulting in a high-efficiency, high-brightness display device.

Implementation Method 1

a reflective plate disposed on the plurality of patterns

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 2

the inclined surfaces are formed on the plurality of patterns, which may improve front brightness

Methodology Applied

Scientific EffectLight refraction: Refraction

Data Source

PatentUS20250160077A1Display device

Publication Date: 2025.05.15 LG DISPLAY CO LTD

AI summary

Provided is a display device. The display device includes a substrate. The display device includes a plurality of patterns disposed on the substrate. The display device includes a reflective plate disposed on the plurality of patterns. The display device includes a light-emitting element disposed on the reflective plate. The plurality of patterns are closed curves.