Multi-stage Curved Reflectors for Backlight Light Crosstalk

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing on-board display apparatuses suffer from reduced contrast due to light crosstalk between display areas, leading to poor display effects and user experience, and the addition of shelters to mitigate this issue results in shadows when all light sources are lit, further reducing optical grade.

Innovation Solution

A backlight module with a substrate, light sources, and multi-stage curved reflectors surrounding the light sources, where the reflectors' surfaces facing the light sources are concave cambered with radian values between 10° and 25°, effectively collimating light and preventing light leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If light sources are arranged on the periphery of the backlight module, then the coverage area is improved, but light crosstalk occurs between display areas reducing contrast

Engineering Contradiction:

Improvecoverage areaVSAvoidlight crosstalk

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

A light guide is introduced as an intermediary component between the peripheral light sources and the display areas. The light guide conducts light from the peripheral light sources to the display areas, preventing direct light crosstalk while maintaining coverage. This mediator component solves the contradiction by separating the light source arrangement from the display area illumination path.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The backlight module is segmented into multiple independent light source units, each with its own light guide. This segmentation allows peripheral light sources to be positioned for coverage while their light is individually controlled and directed through light guides to prevent crosstalk between adjacent display areas.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If shelters are added to prevent light crosstalk, then contrast is improved, but shadows appear when all light sources are lit reducing optical grade

Engineering Contradiction:

Improvelight crosstalkVSAvoidshadows

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The light guide serves as a mediator that transmits light from peripheral sources without requiring physical shelters between light sources and display areas. This eliminates the shadowing problem while still preventing light crosstalk through the light guiding mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The mechanical shelter structure is replaced with an optical system (light guide) that conducts light in a controlled manner. This substitution eliminates the need for physical barriers that cast shadows, while achieving the same goal of preventing light crosstalk through optical path control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Speed

If light sources are positioned close to display areas, then response time is improved, but light leakage occurs reducing contrast

Engineering Contradiction:

Improveresponse timeVSAvoidlight leakage

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The light guide acts as an intermediary that allows light sources to be positioned close to display areas for fast response while controlling the light path to prevent leakage. The light guide confines the light within its structure and directs it to the display area, preventing lateral leakage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light guide can be implemented as a thin film or flexible structure that closely follows the display area contour. This allows the light source to be positioned very close to the display for rapid response while the thin film structure confines and directs light to prevent leakage.

Inventive Principle:

Principle #30Flexible shells and thin films

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

The proposed solution improves contrast and optical grade by preventing light leakage and uniformizing light distribution within the reflectors, thereby enhancing user experience and display quality.

Implementation Method 1

The surfaces, facing the light sources, of the reflectors are multi-stage curved surfaces... the light emitted from a side surface of the light source basically emits in the vertical direction after being adjusted by the reflector

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS12287545B2Backlight module and display apparatus with backlight module

Publication Date: 2025.04.29 KUNSHAN WAYS ELECTRONICS

AI summary

The present application discloses a backlight module and a display apparatus with the backlight module. The backlight module includes a substrate, a plurality of light sources, and a plurality of reflectors. The reflectors are arranged on the peripheries of the light sources. The surfaces, facing the light sources, of the reflectors are multi-stage curved surfaces. Light emitted from a side surface of the light source basically emits in the vertical direction after being adjusted by the multi-stage curved surface of the reflector, so as to collimate the light emitted from the light source, prevent the light emitted from the lighted light source on the periphery from irradiating an unlighted area nearby, and prevent light leakage. By using the reflector with this structure, in internal space formed in the reflector, the light in the internal space formed by each reflector is uniform, improving the optical grade of the display apparatus.