Light-Diffusing Member Azimuthal Luminance Control

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Solution Overview

Problem

Conventional liquid crystal displays face challenges in improving viewing angle properties without increasing the ratio of air layers in the light-diffusing member, which affects image quality, especially in directions like the distinct vision direction of TN liquid crystal panels.

Innovation Solution

A liquid crystal display configuration that includes a liquid crystal panel with polarizing plates and a light-diffusing member on the exit side, featuring optically transparent base material with light-shielding and light-diffusing portions, where the light-diffusing portions have a larger incident surface area and a reflective surface to enhance light diffusion without increasing air layer ratios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the ratio of fine air layers (voids) in the light-diffusing member is increased to enhance reflected light strength, then the viewing angle property is improved, but the front transmittance of the light-diffusing member decreases

Engineering Contradiction:

Improvereflected light strengthVSAvoidfront transmittance

Core Design Contradiction:

Illumination intensityVSQuantity of substance

Solution Approach 1:

The light-diffusing member is designed with non-uniform air layer distribution, where air layers are concentrated in specific regions rather than uniformly distributed. This allows enhanced light reflection in certain areas while maintaining good light transmission in other areas, resolving the contradiction between reflected light strength and front transmittance

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The light-diffusing member employs asymmetric air layer configuration where the distribution and thickness of air layers vary across different regions. This asymmetric design enables the member to provide strong reflected light in specific directions while maintaining high transmittance in others, addressing the technical contradiction

Inventive Principle:

Principle #4Asymmetry

2Adaptability or versatility

If conventional light-diffusing members are used to improve viewing angle, then the viewing angle property is enhanced, but color variation increases in the distinct vision direction

Engineering Contradiction:

Improveviewing angle propertyVSAvoidcolor variation

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes the parameters of the light-diffusing member by controlling the distribution, thickness, and position of air layers to optimize both viewing angle and color consistency. By adjusting these parameters, the member achieves wide viewing angle while minimizing color variation in the distinct vision direction

Inventive Principle:

Principle #35Parameter changes

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 configuration enhances viewing angle properties without increasing air layer ratios, improving transmittance and luminance in specific azimuths, reducing color variation in the distinct vision direction, and maintaining high luminance and transmittance, thus improving overall image quality.

Implementation Method 1

a reflective surface that is in contact with the light-exit end surface and the light-incident end surface and reflects light incident on the light-incident end surface

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

a light-diffusing member that is disposed on the light-exit side of the liquid crystal panel and causes light emitted from the liquid crystal panel to diffuse in an azimuth-angle direction

Methodology Applied

Scientific EffectLight diffusion: Scattering

Data Source

PatentUS9904094B2Liquid crystal display

Publication Date: 2018.02.27 SHARP KK

AI summary

A liquid crystal display (1) includes a liquid crystal panel (4), a backlight (2), and a light-diffusing member (7). There exist azimuths in which a transmittance of the liquid crystal panel (4) and a luminance of the backlight (2) are higher than a transmittance and a luminance in a direction of a normal. The azimuth in which the transmittance of the liquid crystal panel (4) is higher coincides with the azimuth in which the luminance of the backlight (2) is higher.