Curved Display Backlight Unit Stress Distribution via Segmented Support

Solution Overview

Problem

Curved display devices face deformation due to stress applied when bending elements, leading to deteriorated display quality, as the curved surface tends to return to its original shape, causing continuous stress on the backlight unit.

Innovation Solution

A display device design featuring a backlight unit with a flat bottom chassis, a supporting part having a curved upper surface, and a light guide plate curved to match the supporting part's surface, distributing the repulsive force and preventing deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If elements (display panel and light guide plate) are bent to form a curved surface, then the display device achieves a curved shape, but stress is applied to the curved surface causing deformation and deteriorated display quality

Engineering Contradiction:

Improvecurved shapeVSAvoiddeformation

Core Design Contradiction:

ShapeVSStability of the object's composition

Solution Approach 1:

The supporting part is divided into multiple segments including a first supporting part with a first curvature radius and a second supporting part with a second curvature radius. This segmentation allows different regions to have different curvature characteristics, enabling the light guide plate to be supported at multiple points along its curvature, thereby distributing stress and preventing deformation while maintaining the overall curved shape.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The supporting part acts as an intermediary element between the bottom chassis and the light guide plate. It transfers and distributes the repulsive force from the bent light guide plate to the bottom chassis through its multiple supporting structures, preventing direct stress concentration on the light guide plate and thus avoiding deformation that would deteriorate display quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Shape

If the light guide plate is curved to match the display panel, then the curved surface is formed, but the repulsive force causes continuous stress on the backlight unit

Engineering Contradiction:

Improvecurved surfaceVSAvoidrepulsive force

Core Design Contradiction:

ShapeVSStress or pressure

Solution Approach 1:

The supporting part is divided into multiple segments including a first supporting part with a first curvature radius and a second supporting part with a second curvature radius. This segmentation allows different regions to have different curvature characteristics, enabling the light guide plate to be supported at multiple points along its curvature, thereby distributing stress and preventing deformation while maintaining the overall curved shape.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The supporting part utilizes different curvature radii (first curvature radius and second curvature radius) to match different regions of the curved light guide plate. By varying the curvature parameter across different supporting segments, the design optimizes stress distribution to effectively counteract the repulsive force while maintaining the desired curved surface geometry.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If a flat bottom chassis is used, then manufacturing is simplified, but the repulsive force from the curved light guide plate cannot be effectively distributed

Engineering Contradiction:

Improveflat bottom chassisVSAvoiddeformation prevention

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The supporting part is divided into multiple segments including a first supporting part with a first curvature radius and a second supporting part with a second curvature radius. This segmentation allows different regions to have different curvature characteristics, enabling the light guide plate to be supported at multiple points along its curvature, thereby distributing stress and preventing deformation while maintaining the overall curved shape.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The supporting part acts as an intermediary element between the bottom chassis and the light guide plate. It transfers and distributes the repulsive force from the bent light guide plate to the bottom chassis through its multiple supporting structures, preventing direct stress concentration on the light guide plate and thus avoiding deformation that would deteriorate display quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10132991B2Backlight unit, display device, and method of manufacturing the display device

Publication Date: 2018.11.20 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel which displays an image and is curved with respect to a first direction, a light guide plate disposed under the display panel and curved with respect to the first direction, a light source which provides a light to the light guide plate, a bottom chassis disposed under the light guide plate, and a supporting part disposed between the light guide plate and the bottom chassis and including an upper surface curved with respect to the first direction and a lower surface which is flat.