Light Control Sheet with Angled Interfaces for Bright Privacy
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Solution Overview
Problem
Existing privacy films for displays reduce brightness and require higher power illumination to compensate, leading to increased energy consumption and reduced visibility for intended users.
Innovation Solution
Light control sheets with an array of disruptive optical interfaces, comprising elongate optical elements and separation gaps, allow image visibility within a specific field of view while obscuring it outside this field, maintaining high brightness and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If oriented high aspect opaque elements are used to achieve view angle limitation, then privacy protection is improved, but effective brightness is reduced
Solution Approach 1:
The patent changes the orientation parameter of the optical elements from vertical (conventional) to angled relative to the display surface. This parameter change allows the elements to redirect light at specific angles, maintaining brightness for users viewing from the front while blocking side views, thus resolving the contradiction between view angle control and effective brightness
Solution Approach 2:
The patent combines optical elements with specific refractive indices and geometries in a composite structure that selectively transmits and redirects light. This composite approach enables simultaneous achievement of view angle limitation and brightness maintenance by optimizing the interaction between light and the structured optical elements
2Illumination intensity
If higher power illumination is used to compensate for reduced brightness, then visibility is improved, but energy consumption increases
Solution Approach 1:
By changing the orientation parameter of optical elements to angled configurations, the patent optimizes light transmission efficiency. This allows sufficient visibility to be achieved with lower illumination power, directly reducing energy consumption while maintaining visibility requirements
3Object-affected harmful factors
If conventional privacy films are used to obscure side views, then privacy protection is improved, but image clarity for intended users is reduced
Solution Approach 1:
The patent optimizes the angular parameter of optical elements to precisely control light redirection. This precise parameter control ensures that light from the display is redirected only to intended viewing angles, maintaining sharp image clarity for users while effectively obscuring side views, thus resolving the contradiction between privacy protection and image clarity
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
Provides effective control of the field of view with increased brightness and reduced energy consumption, enhancing user experience without compromising image clarity.
Implementation Method 1
The light control sheet has an internal an array of disruptive optical interfaces... The transmission axis of a disruptive optical interface is not perpendicular to the first and second major faces of the light control sheet... such that an image incident to one of the major faces is visible from the other major faces within a field of view which is perpendicular to the major faces but wherein the image is obscured outside the field of view
Data Source
AI summary
A light control sheet having opposing first and second major faces and an internal array of disruptive optical interfaces, wherein the light control sheet is light transmissive such that an image incident to one of the major faces is visible from the other major faces within a field of view which is perpendicular to the major faces but wherein the image is obscured outside the field of view.