Optical Sheet Prism Patterns Diffusion Dots LCD Luminance

Solution Overview

Problem

LCD devices face limitations in optical characteristics, such as limited viewing angle and increased manufacturing costs due to the need for multiple optical sheets, which can lead to defects and complex assembly processes.

Innovation Solution

An optical sheet design featuring a base film with protruded prism patterns and a diffusion member, including diffusion dots or grooves, enhances front luminance and luminance uniformity, while air tunnels and temporary adhesive layers simplify manufacturing and reduce assembly complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If multiple optical sheets are used to enhance optical characteristics, then the optical performance is improved, but the assembly complexity and manufacturing cost increase

Engineering Contradiction:

Improveoptical characteristicsVSAvoidassembly complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent combines multiple optical functions (prism sheet for directional light control and diffusion sheet for uniform light distribution) into a single integrated optical sheet. The optical sheet includes a base film with prism patterns formed on its upper surface, and a diffusion layer formed in the lower portion of the base film, eliminating the need for separate optical sheets and simplifying assembly while maintaining enhanced optical characteristics.

Inventive Principle:

Principle #5Merging (Combining)

2Illumination intensity

If multiple optical sheets are used to enhance optical characteristics, then the optical performance is improved, but the manufacturing cost increases

Engineering Contradiction:

Improveoptical characteristicsVSAvoidmanufacturing cost

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent combines multiple optical functions (prism sheet for directional light control and diffusion sheet for uniform light distribution) into a single integrated optical sheet. The optical sheet includes a base film with prism patterns formed on its upper surface, and a diffusion layer formed in the lower portion of the base film, eliminating the need for separate optical sheets and simplifying assembly while maintaining enhanced optical characteristics.

Inventive Principle:

Principle #5Merging (Combining)

3Illumination intensity

If multiple optical sheets are stacked together, then optical characteristics are enhanced, but defects due to scratches occur at contact areas

Engineering Contradiction:

Improveoptical characteristicsVSAvoiddefects

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent combines multiple optical functions (prism sheet for directional light control and diffusion sheet for uniform light distribution) into a single integrated optical sheet. The optical sheet includes a base film with prism patterns formed on its upper surface, and a diffusion layer formed in the lower portion of the base film, eliminating the need for separate optical sheets and simplifying assembly while maintaining enhanced optical characteristics.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If the liquid crystal layer thickness is increased to improve viewing angle, then the viewing angle is enhanced, but the front luminance decreases

Engineering Contradiction:

Improveviewing angleVSAvoidfront luminance

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent applies different optical functions to different regions of the optical sheet. The upper surface features prism patterns for controlling light direction and enhancing viewing angle, while the lower portion features a diffusion layer for uniform light distribution. This local differentiation allows the optical sheet to simultaneously improve viewing angle and maintain front luminance without requiring increased liquid crystal layer thickness.

Inventive Principle:

Principle #3Local quality

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 optical sheet design improves display quality by enhancing front luminance and viewing angle, reduces manufacturing costs, and simplifies the assembly process by eliminating the need for additional diffusion sheets and minimizing defects.

Implementation Method 1

The prism patterns are protruded to be spaced apart from each other on the base film to enhance the front luminance of light incident from the lower side of the base film

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

The diffusion member includes a plurality of diffusion dots capable of enhancing the luminance uniformity of light incident from the lower side of the base film

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS8730579B2Optical sheet having enhanced optical characteristics

Publication Date: 2014.05.20 SANGBOGROUP CO LTD

AI summary

An optical sheet includes a base film in which light is incident from a lower side, a plurality of prism patterns and a diffusion member. The prism patterns are protruded to be spaced apart from each other on the base film to enhance the front luminance of light incident from the lower side of the base film. The diffusion member is disposed between prism patterns to have a diffusion surface in parallel with the base film. The diffusion member includes a plurality of diffusion dots capable of enhancing the luminance uniformity of light incident from the lower side of the base film. Thus, front luminance and luminance uniformity may be enhanced due to a juxtaposition of the prism patterns and the diffusion portion, and the viewing angle of the LCD device may be enhanced.