Light Path Control Member for Dynamic Viewing Angle Adjustment
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Solution Overview
Problem
Existing light-shielding films struggle to effectively control viewing angles in display devices, particularly in mobile and vehicle applications, as they fail to adjust light transmission efficiently across different incident angles, leading to suboptimal image quality and glare issues.
Innovation Solution
A light path control member comprising a first substrate, a first electrode, a light conversion unit with a light transmitting part, a high reflective part, and a transmittance variable part between them, where the transmittance of the variable part changes with voltage application, allowing for controlled light transmission and improved viewing angles by switching between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light-shielding film is used to control viewing angles, then light transmission can be blocked in specific directions, but the left and right viewing angles in share mode remain insufficient
Solution Approach 1:
The light conversion unit is segmented into three distinct functional parts: a light transmitting part for forward light transmission, a high reflective part for reflecting oblique light, and a transmittance variable part for dynamic control. This segmentation allows each part to specialize in controlling light in specific directions, thereby improving left and right viewing angles in share mode while maintaining overall image quality.
Solution Approach 2:
The transmittance variable part introduces dynamic control capability by changing its light transmittance based on applied voltage. This dynamic adjustment enables the light path control member to adapt to different viewing conditions and modes (such as share mode), effectively improving viewing angle performance without compromising image quality under varying operational conditions.
2Adaptability or versatility
If multiple functional layers are integrated into the light path control member, then viewing angle control and phase retardation are improved, but the overall thickness increases
Solution Approach 1:
The patent merges the viewing angle control layer and phase retardation layer into a single integrated light path control member structure. By combining these functions into one component with a unified design, the patent achieves both viewing angle control and phase retardation effects without the cumulative thickness increase that would result from stacking separate layers, thereby reducing overall thickness while maintaining enhanced viewing angle performance.
3Object-affected harmful factors
If a light-shielding film is used to shield outside light, then glare is prevented, but the transmission of light in needed directions is restricted
Solution Approach 1:
The light path control member applies local quality by assigning different optical properties to different parts: the light transmitting part allows high light transmission in forward directions, the high reflective part provides strong reflection for oblique incident light to prevent glare, and the transmittance variable part offers localized dynamic control. This spatial differentiation of optical properties enables glare prevention without unduly restricting light transmission in needed directions.
Solution Approach 2:
The transmittance variable part provides dynamic adjustment capability, allowing the system to adapt light transmission levels based on operational conditions. This dynamic control enables the optimization of the balance between glare prevention and light transmission in needed directions, permitting high transmission when required while maintaining glare protection when necessary.
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 solution integrates a viewing angle control layer and phase retardation layer, reducing overall thickness and enhancing left and right viewing angles by dynamically adjusting light transmission based on voltage, thereby improving image clarity and reducing glare.
Implementation Method 1
light transmittance of the transmittance variable part is changed according to application of a voltage
Implementation Method 2
a high reflective part around the light transmitting part
Data Source
AI summary
A light path control member according to one embodiment includes a first substrate; a first electrode disposed on the first substrate; a light conversion unit disposed on the first electrode; a second electrode disposed on the light conversion unit; and a second substrate disposed on the second electrode. The light conversion unit includes a light transmitting part, a high reflective part around the light transmitting part, and a transmittance variable part between the light transmitting part and the high reflective part. The light transmittance of the transmittance variable part is changed based on the voltage applied.