Light Modulation Film Structure for Privacy Viewing and Front Brightness

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Solution Overview

Problem

Existing display devices with anti-peep functions experience significant brightness reduction as the viewing angle increases, causing user discomfort.

Innovation Solution

A light modulation unit comprising an optical film with microstructures and a collimating optical layer that controls light emission angles, maintaining brightness at orthogonal angles and restricting visibility at non-orthogonal angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a light control film is arranged to adjust the light emission angle for anti-peep function, then visibility at non-orthogonal angles is restricted, but brightness significantly decreases as viewing angle increases causing viewing discomfort

Engineering Contradiction:

Improvevisibility at non-orthogonal anglesVSAvoidbrightness at orthogonal angle

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The light modulation unit is divided into multiple functional layers: a collimating optical layer with microlens arrays to control light direction, and an optical film with microstructures to further modulate light emission. This segmentation allows independent optimization of each layer's function to achieve both anti-peep effect and maintained brightness

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The collimating optical layer acts as an intermediary between the light source and the optical film, converting divergent light from the LED into collimated light beams. This intermediary function enables precise control of light emission angles while maintaining brightness, resolving the contradiction between anti-peep function and viewing comfort

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enhances viewing comfort by maintaining brightness at orthogonal angles while achieving an anti-peep effect, allowing users to switch between privacy and sharing modes.

Implementation Method 1

a first light emitting unit emits an initial light beam to the collimating optical layer, the initial light beam passes through the collimating optical layer to form a collimated beam

Methodology Applied

Scientific EffectCollimation: Lens

Implementation Method 2

the collimated beam passes through the light entrance surface to enter the optical film and then exits from the microstructures of the light exit surface to form a divergent light beam

Methodology Applied

Scientific EffectLight modulation through microstructures: Diffraction

Data Source

PatentUS12625398B2Light modulation unit and display device thereof

Publication Date: 2026.05.12 DARWIN PRECISIONS CORP

AI summary

The invention provides a light modulation unit including a collimating optical layer and an optical film. The optical film has a light exit surface and a light entrance surface opposite to the light exit surface. The collimation optical layer and the light entrance surface of the optical film are disposed relatively. The light exit surface forms a plurality of microstructures, each of which has a height h in the normal direction of the light exit surface and a virtual aperture φ in the x-coordinate axis direction parallel to the light exit surface, and the ratio of the height h to the virtual aperture φ (h/φ) is 0.2 to 1. The light modulation unit of the present invention has the function of adjusting the brightness of anti-peep viewing angles, and can improve the display brightness of front viewing angles through light pattern control.