Backlight Module Prism Structures for Front Light Concentration

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing electronic devices with concentrated light sources face challenges of high energy consumption and high cost due to the use of privacy sheets or collimated backlight modules, which are not energy-efficient or cost-effective.

Innovation Solution

A backlight module design featuring a light guide plate with multiple optical units having prism structures, where the first prism structure faces the light guide plate, and the second and third prism structures face the panel, optimizing light concentration towards the front viewing angle without additional privacy protection sheets or collimated modules.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If privacy sheets or collimated backlight modules are used to achieve concentrated light sources, then privacy protection is improved, but energy consumption increases

Engineering Contradiction:

Improveprivacy protectionVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The backlight module is segmented into multiple optical units (first, second, and third optical units) with different prism structures positioned at specific locations. This segmentation allows different regions of the backlight to serve different functions: the first optical unit concentrates light for brightness enhancement, while the second and third optical units control light distribution for privacy protection, achieving both goals without excessive energy consumption

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different optical units are designed with different prism structures tailored to their specific functions. The first optical unit has a first prism structure optimized for light concentration, while the second and third optical units have second and third prism structures optimized for light distribution control. This local quality differentiation enables each region to perform its specific function efficiently, reducing overall energy consumption while maintaining privacy protection

Inventive Principle:

Principle #3Local quality

2Reliability

If privacy sheets or collimated backlight modules are used to achieve concentrated light sources, then privacy protection is improved, but manufacturing cost increases

Engineering Contradiction:

Improveprivacy protectionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges multiple functions (light concentration, light distribution control, and privacy protection) into a single integrated backlight module structure. By combining the first, second, and third optical units with different prism structures into one module, the design eliminates the need for separate privacy sheets and collimated backlight modules, thereby reducing manufacturing complexity and cost while maintaining privacy protection functionality

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If traditional backlight modules are used, then manufacturing cost is reduced, but light concentration towards front viewing angle is insufficient

Engineering Contradiction:

Improvemanufacturing costVSAvoidlight concentration

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The patent introduces a multi-dimensional optical control approach by positioning optical units at different locations (first optical unit at one position, second and third optical units at another position) and using different prism structures oriented in different directions. This dimensional differentiation enables precise control of light concentration towards the front viewing angle while maintaining cost-effectiveness through a modular design

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design enhances light concentration towards the front viewing angle, achieving privacy requirements while reducing energy consumption and costs by improving light utilization and brightness uniformity.

Implementation Method 1

a first optical unit disposed on the light guide plate and having a first prism structure

Methodology Applied

Scientific EffectPrism refraction: Refraction

Implementation Method 2

a second optical unit disposed on the first optical unit and having a second prism structure

Methodology Applied

Scientific EffectPrism refraction: Refraction

Implementation Method 3

a third optical unit disposed on the second optical unit and having a third prism structure

Methodology Applied

Scientific EffectPrism refraction: Refraction

Data Source

PatentUS11573364B2Backlight module and electronic device comprising the same

Publication Date: 2023.02.07 INNOLUX CORP

AI summary

A backlight module and an electronic device including the same are provided. The electronic device includes: a panel; and a backlight module opposite to the panel and including: a light guide plate; a first optical unit disposed on the light guide plate and having a first prism structure; a second optical unit disposed on the first optical unit and having a second prism structure; and a third optical unit disposed on the second optical unit and having a third prism structure, wherein the first prism structure faces the light guide plate, and the second prism structure and the third prism structure face the panel.