Light Path Control Layer for Viewing Angle and Front Luminance
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Solution Overview
Problem
Existing light-shielding films in display devices struggle to balance private and share modes while maintaining high front luminance, as they often result in reduced light transmission and inefficient light management.
Innovation Solution
A light path control device incorporating a first viewing angle control member with light-shielding patterns and a diffractive transmitting layer featuring slits that induce constructive interference, along with a second viewing angle control member using liquid crystal technology, to control light paths and enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light-shielding film is used to control light paths for private and share modes, then viewing angle control is achieved, but front luminance is reduced
Solution Approach 1:
The light-shielding film is segmented into multiple light-shielding patterns arranged at regular intervals, creating distinct light-shielding regions and light-transmitting regions. This segmentation allows selective control of light paths for different viewing angles while maintaining front luminance through the light-transmitting regions.
Solution Approach 2:
Different regions of the light-shielding film are assigned different functions: light-shielding patterns provide viewing angle control for private and share modes, while the light-transmitting regions between patterns maintain front luminance. This local differentiation resolves the contradiction between viewing angle control and front luminance.
2Adaptability or versatility
If light-shielding patterns are added to control viewing angles, then private and share modes are enabled, but light transmission is reduced
Solution Approach 1:
The film structure is segmented into alternating light-shielding patterns and light-transmitting regions. The light-transmitting regions ensure sufficient light transmission while the light-shielding patterns provide viewing angle control, balancing both requirements.
Solution Approach 2:
A transparent resin layer is introduced as an intermediary between the light-shielding patterns and the external environment. This layer fills the gaps between patterns, provides structural support, and maintains optical clarity, thereby preserving light transmission while enabling viewing angle control through the patterns.
3Adaptability or versatility
If existing light-shielding films are used to balance private and share modes, then viewing angle control is achieved, but light loss increases
Solution Approach 1:
The light-shielding film is divided into discrete light-shielding patterns rather than using continuous light-shielding layers. This segmentation minimizes the total area of light-shielding material, reducing light absorption and reflection losses while maintaining effective viewing angle control through the patterned structure.
Solution Approach 2:
The light-shielding patterns, which would normally absorb and reflect light causing energy loss, are designed to selectively block only the necessary viewing angles while allowing front light transmission. The patterned structure converts what would be uniform light absorption into selective angular control, minimizing overall light loss.
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 achieves improved front luminance and flexible viewing angle control, enabling both private and share modes with enhanced light transmission and reduced light loss.
Implementation Method 1
The plurality of slits may be formed to induce diffraction of lights incident to the plurality of slits so that the diffracted lights cause constructive interference.
Implementation Method 2
The plurality of slits may be formed to induce diffraction of lights incident to the plurality of slits so that the diffracted lights cause constructive interference.
Implementation Method 3
A light-shielding film can function as a light path control device that blocks light in a specific direction and transmits light in another specific direction by controlling the movement path of light according to the incident angle of outside light.
Implementation Method 4
a second viewing angle control member that is formed on an upper portion of the first viewing angle control member and includes a first electrode, a second electrode, and a liquid crystal layer interposed between the first electrode and the second electrode.
Data Source
AI summary
Embodiments relate to a light path control device, including a first viewing angle control member including light-shielding patterns patterned at regular intervals and a pattern cover layer to cover the light-shielding patterns; and a diffractive transmitting layer that is disposed on a lower portion of the first viewing angle control member and includes a plurality of slits, and a display device including the light path control device.