Stereoscopic Display Light Source Luminance Attenuation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional stereoscopic image display devices exhibit a grid-like visual effect due to greater center intensity of the lens compared to edge intensity, resulting in poor image quality.

Innovation Solution

A stereoscopic image display device is designed with a flat display unit, a light source unit, and a lens array unit, where the light source has an attenuation amplitude of luminance not greater than 65% within a divergence angle of the light field system, reducing the grid visual effect by optimizing the light source's optical characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a conventional light source is used in the light field system, then the device structure is simple, but the center intensity of the lens is greater than the edge intensity, causing a grid-like visual effect with light and dark contrast

Engineering Contradiction:

Improvedevice structureVSAvoidgrid visual effect

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by making different regions of the light source have different luminance characteristics. Specifically, the light source is designed with a luminance distribution where the center region has lower luminance and the edge regions have higher luminance, which compensates for the lens's natural intensity distribution and reduces the grid visual effect while maintaining simple device structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the luminance parameter distribution of the light source from uniform to non-uniform. By controlling the attenuation amplitude of luminance within the divergence angle to be not greater than a specific value, the patent adjusts the light intensity parameters to match the lens characteristics, thereby eliminating the grid visual effect without complicating the device structure

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the light source luminance is uniformly distributed, then the device is easy to manufacture, but the grid visual effect occurs due to mismatch with lens intensity distribution

Engineering Contradiction:

Improvelight source manufacturingVSAvoidgrid visual effect

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent implements local quality by creating a light source with spatially varying luminance characteristics. The light source is designed to emit light with different intensities at different locations, specifically with enhanced edge luminance and reduced center luminance, which matches the lens transmission characteristics and eliminates the grid visual effect while maintaining manufacturing feasibility

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies inversion by reversing the conventional approach to light source design. Instead of making the light source uniform and accepting the lens's non-uniform response, the patent inverts the strategy by making the light source non-uniform in a way that compensates for the lens characteristics, thereby canceling out the grid visual effect

Inventive Principle:

Principle #13The other way round (Inversion)

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 solution effectively reduces the grid visual effect and enhances the display quality of stereo images by ensuring smooth light intensity distribution across the lens array, allowing for improved perception of depth and image clarity.

Implementation Method 1

The light source unit is configured to provide a light source to pass through the flat display unit. After the light source provided by the light source unit passes through the flat display unit, the light source is capable of passing through the lens array unit, so that the light of the integrated image is capable being reconstructed into a stereo image

Methodology Applied

Scientific EffectLight transmission and refraction: Refraction

Implementation Method 2

an attenuation amplitude of a luminance of the light source before entering the lens array unit being not greater than 65% within a divergence angle of a light field system of the stereoscopic image display device

Methodology Applied

Scientific EffectLuminance attenuation: Absorption (EM radiation)

Data Source

PatentUS20220360762A1Stereoscopic image display device capable of reducing grid visual effect

Publication Date: 2022.11.10 LIXEL INC

AI summary

A stereoscopic image display device capable of reducing grid visual effect includes a flat display unit, a light source unit disposed on a side of the flat display unit, and a lens array unit disposed on another side of the flat display unit. A light source provided by the light source unit satisfies an optical characteristic as follows: an attenuation amplitude of a luminance of the light source before entering the lens array unit being not greater than 65% within a divergence angle of a light field system of the stereoscopic image display device, thereby reducing the grid visual effect of a stereo image generated by the stereoscopic image display device.