Electrochromic Light Path Control for Wide Luminance Privacy Displays
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Solution Overview
Problem
Light-shielding films attached to display devices reduce luminance, limiting their effectiveness in adjusting viewing angles and maintaining image clarity.
Innovation Solution
A light path control device incorporating a substrate with light-shielding patterns and a lens assembly, featuring electrochromic elements and lenses, to dynamically control light transmission and viewing angles, enhancing luminance in both liquid crystal and organic light-emitting diode displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light-shielding film is attached to control light path and viewing angle, then viewing angle control is improved, but luminance is reduced
Solution Approach 1:
The light-shielding film is divided into multiple light-shielding patterns arranged in specific directions (first and second directions perpendicular to each other). These patterns are segmented to create directional light blocking while maintaining overall light transmission, allowing viewing angle control without excessive luminance reduction. The segmentation enables selective light path control in different orientations.
Solution Approach 2:
The light-shielding patterns have different properties in different regions and directions. The patterns are designed with specific widths, spacing, and orientations to provide directional light shielding characteristics. This local quality variation allows the film to control viewing angles selectively while maintaining high luminance in desired directions, resolving the contradiction between viewing angle control and luminance preservation.
2Adaptability or versatility
If light-shielding patterns are used to block light in specific directions, then viewing angle restriction is achieved, but light transmission is reduced
Solution Approach 1:
The light-shielding patterns exhibit asymmetric design where the pattern width, spacing, and orientation are specifically configured to create different light transmission characteristics in different directions. This asymmetry enables effective light path control for viewing angle restriction while minimizing energy loss by allowing maximum light transmission in the desired viewing direction through optimized pattern geometry and arrangement.
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 device improves luminance and adjusts viewing angles effectively, enabling share and private modes while maintaining image clarity, applicable to both LCD and OLED displays.
Implementation Method 1
the light-shielding patterns may include electrochromic elements to implement a light-shielding mode or a light-transmitting mode
Implementation Method 2
a lens assembly that is formed on the viewing angle control member and includes a plurality of lenses
Data Source
AI summary
A light path control device includes a substrate, a viewing angle control member including light-shielding patterns patterned on the substrate at regular intervals, and a lens assembly that is formed on the viewing angle control member and includes a plurality of lenses, wherein the light-shielding patterns include electrochromic elements to implement a light-shielding mode or a light-transmitting mode, and a display device including the light path control device.