Light Refraction Structure for Dual-Viewing-Angle Displays

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Solution Overview

Problem

Dual-viewing-angle display devices have limited side viewing angles and brightness, leading to confusion and color crosstalk, especially when viewing angles exceed a certain range, with no effective solution in existing technologies to address these issues.

Innovation Solution

A light refraction structure featuring a base substrate with parallel light-shielding stripes and protrusions made of transparent material, capable of refracting light beams towards the stripes, which are formed using negative photosensitive resin materials and can have semi-circular, semi-elliptical, conical, trapezoidal, or rectangular cross-sections, integrated into a color filter substrate or display device to enhance viewing angles and prevent color crosstalk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the aperture ratio of the grating is increased to improve brightness, then the brightness of the dual-viewing-angle display device increases, but color crosstalk becomes more serious

Engineering Contradiction:

ImprovebrightnessVSAvoidcolor crosstalk

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The grating structure is segmented into multiple light-shielding stripes with transparent protrusions between them. This segmentation allows light to be divided into multiple paths, refracting different wavelengths of light in different directions to reduce color crosstalk while maintaining brightness through increased aperture ratio

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the grating structure have different properties: light-shielding stripes block certain wavelengths while transparent protrusions allow light transmission and refraction. This local differentiation enables selective light control to minimize color crosstalk in specific viewing angle regions

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the aperture ratio of the grating is decreased to reduce color crosstalk, then color crosstalk is reduced, but the brightness and side viewing angle decrease

Engineering Contradiction:

Improvecolor crosstalkVSAvoidbrightness

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The invention adds a vertical dimension to the grating structure by creating protrusions that extend from the base substrate. This three-dimensional structure increases the effective aperture ratio and light refraction capability without compromising the horizontal spacing that controls color crosstalk

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If the aperture ratio is adjusted to control viewing angles, then viewing angle separation is improved, but side viewing angle and brightness are compromised

Engineering Contradiction:

Improveviewing angle separationVSAvoidbrightness

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The grating structure dynamically adapts light transmission based on viewing angle through its refractive geometry. The transparent protrusions refract light at different angles depending on the incident angle, enabling the system to maintain high brightness for front viewing while providing separated viewing angles for side viewers

Inventive Principle:

Principle #15Dynamics

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 light refraction structure effectively increases side viewing angles and brightness of dual-viewing-angle display devices, reducing color crosstalk and allowing for clearer image viewing across a larger region without significantly reducing the glass substrate thickness, thus improving manufacturing efficiency.

Implementation Method 1

a protrusion made of a transparent material and arranged between the adjacent light-shielding stripes, wherein the protrude is capable of refracting a light beam from the base substrate in a direction close to the light-shielding stripe

Methodology Applied

Scientific EffectLight refraction: Refraction

Implementation Method 2

The transparent material is a resin material having negative photosensitivity

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS10203429B2Light refraction structure and its manufacture method, color filter substrate and its manufacture method, and display device

Publication Date: 2019.02.12 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure provides a light refraction structure and its manufacture method, a color filter substrate and its manufacture method, and a display device. The method for manufacturing the light refraction structure includes steps of: forming on a base substrate a plurality of light-shielding stripes parallel to each other, and forming a protrusion made of a transparent material between the adjacent light-shielding stripes, wherein the protrude is capable of refracting a light beam from the base substrate in a direction close to the light-shielding stripe.