Pre-warped Light Shielding Mask for Display Device

Solution Overview

Problem

Conventional display devices experience positional deviations and uneven viewing angles due to deflection of the light shielding louver when screwed, leading to impaired visibility, especially in bright environments.

Innovation Solution

A manufacturing method involving a substrate with mounted light emitting elements and a light shielding mask with pre-formed warping to protrude towards the incident light side, which is screwed to a case to maintain parallel alignment, offsetting deflection and ensuring a wide viewing angle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the light shielding louver is screwed to the front surface of the light emitting element, then the light shielding function is improved, but the positional relationship between the light emitting element and the light shielding louver deviates due to deflection

Engineering Contradiction:

Improvelight shielding functionVSAvoidpositional relationship

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The light shielding mask is pre-warped to protrude toward the incident light side before assembly. This preliminary deformation compensates for the deflection that occurs during screwing, ensuring that the mask remains parallel to the substrate even after being fixed with screws, thereby maintaining precise positional relationship while achieving effective light shielding

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If the light shielding louver is screwed tightly, then the light shielding function is improved, but the viewing angle becomes narrower and views become uneven due to deflection

Engineering Contradiction:

Improvelight shielding functionVSAvoidviewing angle

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The light shielding mask is pre-warped to protrude toward the incident light side before assembly. This preliminary deformation compensates for the deflection that occurs during screwing, ensuring that the mask remains parallel to the substrate even after being fixed with screws, thereby maintaining precise positional relationship while achieving effective light shielding

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If a flat light shielding mask is used, then the manufacturing is simpler, but deflection occurs during screwing causing positional deviation

Engineering Contradiction:

Improvemask manufacturingVSAvoidpositional relationship

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The light shielding mask is pre-warped to protrude toward the incident light side before assembly. This preliminary deformation compensates for the deflection that occurs during screwing, ensuring that the mask remains parallel to the substrate even after being fixed with screws, thereby maintaining precise positional relationship while achieving effective light shielding

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9812041B2Display device manufacturing method

Publication Date: 2017.11.07 NICHIA CORP

AI summary

A display device manufacturing method includes: preparing a substrate on which a plurality of light emitting elements are mounted; preparing a light shielding mask that is provided with a plurality of windows respectively transmitting light from the plurality of light emitting elements and that is warped so as to protrude towards an incident side of light from the plurality of light emitting elements; preparing a case in which a substrate is disposed; and screwing the light shielding mask to the case so that the light shielding mask is parallel or approximately parallel with respect to the substrate.