Switchable Light Emission Optics for Directional Privacy Control
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Solution Overview
Problem
Existing electronic devices, such as display and light emitting devices, face challenges in controlling the direction of light emission to prevent unauthorized viewing or interference with drivers, particularly in vehicles, necessitating a solution to manage light output angles and intensities effectively.
Innovation Solution
A light emitting device with switchable light emitting elements and an optical element that can be controlled to emit light in a collimated or diffused state, adjusting light intensity and direction through a light controller using control electrodes and switchable diffusers to manage light output angles and intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If light emitting elements are used to provide illumination or display information, then information transmission and image display are improved, but light may be viewed by unauthorized persons or interfere with drivers
Solution Approach 1:
The patent applies local quality by making different regions of the light emitting device have different light emission characteristics. Specifically, the light emitting elements are controlled to emit light in specific directional ranges, creating localized high-intensity regions for authorized viewing while suppressing light emission in other directions to prevent unauthorized viewing and driver interference.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the emission angle and intensity parameters of the light emitting elements. The device switches between different states (first state with collimated light at specific angles, second state with diffused light) to control where and how light is emitted, thereby resolving the contradiction between providing necessary light information and preventing harmful light exposure to unauthorized areas.
2Ease of operation
If light is emitted in all directions to ensure visibility, then viewing availability is improved, but light intensity cannot be controlled at specific angles to prevent interference
Solution Approach 1:
The patent applies dynamics by making the light emission characteristics switchable and adjustable. The light emitting device can dynamically transition between different emission states (collimated vs. diffused, different viewing angles) based on operational requirements, allowing it to optimize both viewing availability and light intensity control at specific angles rather than maintaining a fixed emission pattern.
Solution Approach 2:
The patent implements universality by designing the light emitting device to perform multiple functions: it can emit light in collimated states for directional visibility, diffused states for broad coverage, and switch between different viewing angle configurations. This multi-functionality allows the single device to adapt to various viewing requirements while maintaining control over light intensity at specific angles.
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 effectively controls light emission, ensuring high collimation or diffusion based on the state, enhancing privacy and safety by managing light distribution to prevent unwanted viewing and interference.
Implementation Method 1
The optical element is configured to guide the first lights for switching the light emitting device in the first state
Implementation Method 2
The first portion of the light emitting elements is configured to emit first lights, and the second portion of the light emitting elements is configured to emit second lights
Data Source
AI summary
A light emitting device is switchable in a first state and a second state, and includes light emitting elements and an optical element. A first portion of the light emitting elements is configured to emit first lights. A second portion of the light emitting elements is configured to emit second lights. The optical element is configured to guide the first lights for switching the light emitting device in the first state. In the first state, the light emitting device has output lights, a first intensity of the output lights is measured at a viewing angle of 0°, a second intensity of the output lights is measured at a viewing angle of θ2 and an azimuth angle of Φ2, and a ratio of the second intensity to the first intensity is less than or equal to 0.1, wherein θ2 ranges from 30° to 60°, and Φ2 is 14° or 166°.