Curved Backlight Panel Flat Region Segmentation

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Solution Overview

Problem

Curved surface backlight modules face issues with reduced distance between light sources leading to short-circuiting and bonding pad breakage or pseudo soldering due to the curvature of the lamp panel, which increases the risk of dead lamps.

Innovation Solution

The method involves a back panel with alternating flat and convex/concave regions and a lamp panel with light sources welded on a front surface, where the back panel's curvature is parallel to the convex and concave regions, reducing the inclination of bonding pads and alleviating pressure, thus preventing short-circuiting and breakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the lamp panel is curved along with the back panel to achieve a curved surface display, then the display device obtains better contrast and wider view angle, but the distance between bonding pads of adjacent light sources is reduced leading to short-circuiting risk and bonding pad breakage

Engineering Contradiction:

Improvedisplay qualityVSAvoidlight source connection reliability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The back panel is segmented into multiple flat regions and convex curved regions, while the lamp panel is segmented into multiple flat regions and concave curved regions. This segmentation allows different regions to serve different functions: flat regions maintain proper bonding pad spacing for reliable light source connections, while curved regions provide the overall curved surface shape for display quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the back panel and lamp panel are given different local qualities - flat regions have zero curvature to protect bonding pads, while convex/concave regions have specific curvatures to achieve the desired display shape. This local differentiation resolves the contradiction by applying curvature only where needed for display quality while maintaining flatness where needed for connection reliability.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the lamp panel is curved to form a curved surface backlight module, then the display device achieves broader market prospects in automobiles and wearable devices, but the bonding pads are squeezed by the lamp panel causing breakage or pseudo soldering

Engineering Contradiction:

Improveapplication scopeVSAvoidbonding pad strength

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The lamp panel is divided into flat regions where bonding pads are located and concave curved regions elsewhere. This segmentation ensures that bonding pads remain in flat, stable regions that resist squeezing and deformation, while the concave curved regions provide the necessary curvature for the display device's application scope.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The lamp panel exhibits different local qualities - flat regions with high strength characteristics to protect bonding pads from breakage, and concave curved regions with flexible characteristics to enable curvature for various applications. This local quality differentiation maintains bonding pad strength while achieving application versatility.

Inventive Principle:

Principle #3Local quality

3Shape

If the horizontal distance between bonding pads is reduced due to curvature, then the lamp panel achieves the desired curved shape, but the risk of short-circuiting between adjacent light sources increases

Engineering Contradiction:

Improvecurved surface shapeVSAvoidshort-circuiting risk

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

The back panel and lamp panel are segmented into flat regions and convex/concave curved regions. In the curved regions, the convex-concave pairing maintains the horizontal distance between bonding pads despite the overall curved shape, preventing short-circuiting while achieving the desired curved surface shape.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The back panel has convex curved regions while the lamp panel has corresponding concave curved regions, creating an asymmetric but complementary relationship. This asymmetric design allows the panels to curve together while maintaining proper bonding pad spacing, resolving the contradiction between curved shape and short-circuiting prevention.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS11294237B2Flexible touch display panel and flexible touch display apparatus

Publication Date: 2022.04.05 XIAMEN TIANMA MICRO ELECTRONICS

AI summary

Disclosed are a method for preparing a curved surface backlight module, a curved surface backlight module and a display device. The method includes described below. An initial back panel is provided, where the initial back panel includes a first surface and a second surface which are opposite to each other, the first surface includes multiple first flat regions and multiple first convex curved regions, each of the multiple first convex curved regions is located between adjacent first flat regions, the second surface includes multiple second flat regions and multiple first concave curved regions. An initial lamp panel is provided. The initial back panel and the initial lamp panel are curved to form the curved surface backlight module, where a curving axis of the curved surface backlight module is parallel to curving axes of the multiple first convex curved regions and curving axes of the multiple first concave curved regions.