Surface Light-Emitting Device with Dual-Angle Light Switching
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Solution Overview
Problem
Existing liquid crystal display devices require viewing angle control means, leading to decreased light transmittance and increased cost.
Innovation Solution
A surface light-emitting device with multiple light sources and a controller that switches between narrow and wide angle light distributions using a simple configuration, including a light guide, prism, and emission surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If viewing angle control means is disposed between light guide plate and liquid crystal panel, then light distribution can be controlled, but light transmittance decreases and device cost increases
Solution Approach 1:
The invention extracts the viewing angle control function from the traditional liquid crystal panel system and relocates it to the light guide plate side. By disposing the viewing angle control means (prism sheet or light controller) on the light guide plate, the patent eliminates the need for complex electrode layers and transmission state variable layers between the light guide plate and liquid crystal panel, thereby maintaining light transmittance while achieving light distribution control.
Solution Approach 2:
The invention replaces the electrical control system (transparent electrode layers and voltage control) with an optical control system using prisms or light controllers. This substitution eliminates the need for electrical components in the light path, reducing light absorption and maintaining higher light transmittance while achieving the same viewing angle control function.
2Adaptability or versatility
If viewing angle control means with electrical control is disposed, then light distribution switching is achieved, but device cost increases
Solution Approach 1:
The invention extracts the viewing angle control function from the liquid crystal panel assembly and integrates it into the light guide plate structure. By using a prism sheet or light controller directly on the light guide plate, the patent eliminates the need for upper and lower transparent electrode layers, transmission state variable layers, and associated voltage control circuits, thereby reducing device complexity and cost while maintaining light distribution switching capability.
Solution Approach 2:
The light guide plate is designed to serve multiple functions: light guiding, light distribution control, and viewing angle adjustment. By integrating the viewing angle control means into the light guide plate, the patent makes the light guide plate a multi-functional component, eliminating the need for separate control layers and reducing overall device complexity.
3Adaptability or versatility
If multiple light sources are used with different positions, then light distribution angle can be switched, but configuration becomes simpler
Solution Approach 1:
The invention uses multiple light sources positioned at different locations relative to the light controller: one light source is positioned on the optical axis to produce narrow angle light distribution, while another is positioned off the optical axis to produce wide angle light distribution. By controlling which light sources are activated, the system can switch between different viewing angles without requiring complex mechanical or electrical control mechanisms.
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
Enables switching between narrow and wide angle light distributions without complex electrical controls, maintaining light transmittance and reducing costs.
Implementation Method 1
a prism that reflects the light having passed through the plurality of light controllers
Data Source
AI summary
A surface light-emitting device includes a plurality of light sources, a light guide that guides light emitted from the plurality of light sources, and a controller that controls turn-on operations of the plurality of light sources. The light guide includes a plurality of light controllers on which the light from the plurality of light sources are incident. The plurality of light controllers are disposed side by side in a first direction intersecting optical axes of the plurality of light controllers, the plurality of light sources include a first light source and a second light source, the first light source is disposed on one of the optical axes of the plurality of light controllers, the second light source is disposed at a position away from the optical axes of the plurality of light controllers, and the controller turns on at least one of the first light source and the second light source.