Multiview Backlight With Scattering Medium And Reflective Layer
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Solution Overview
Problem
Passive electronic displays, such as LCDs and EP displays, lack the ability to emit light independently, limiting their practical applications and requiring external light sources like backlights, which can be inefficient and bulky.
Innovation Solution
A light source with a partially reflective layer and scattering medium is used in a multiview backlight to provide enhanced brightness and collimation of directional light beams, matching the view directions of a multiview display, utilizing optical emitters like LEDs and phosphors to create a compact, efficient light source for multiview displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight is used to illuminate passive displays, then the displays can emit light and function as active displays, but the backlight becomes bulky and inefficient
Solution Approach 1:
The patent combines the light source, scattering medium, and reflective layer into an integrated backlight assembly that is directly coupled to the display panel, eliminating the need for separate bulky components. This merging of functions reduces overall backlight volume while maintaining light emission capability.
Solution Approach 2:
The patent introduces a scattering medium as an intermediary between the light source and the display panel. This scattering medium diffuses the light effectively, allowing for a more compact light source configuration while still providing uniform illumination across the display.
2Illumination intensity
If a conventional light source is used, then the display can be illuminated, but the brightness and directional control of light beams are insufficient
Solution Approach 1:
The patent applies a scattering medium with specific scattering properties at specific locations between the light source and display panel. This localized application of scattering material provides directional control and enhances brightness in specific viewing angles, improving both illumination intensity and directional control.
Solution Approach 2:
The patent modifies the optical parameters of the light propagation path by introducing a scattering medium that changes the scattering angle and light distribution characteristics. This parameter change enables better directional control and enhanced brightness without requiring a larger light source.
3Loss of energy
If passive displays are used without integrated light sources, then power consumption is low, but the displays cannot emit light independently
Solution Approach 1:
The patent creates a self-contained backlight assembly where the light source, scattering medium, and reflective layer work together as an integrated unit. This self-service design provides efficient light emission with minimized energy loss, allowing the display to function independently without requiring external bulky lighting equipment.
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 enhances brightness and efficiency of the light source, providing a compact and efficient means to emit directional light beams suitable for multiview displays, improving the performance and practicality of passive displays by enabling them to function similarly to active displays without the need for bulky external light sources.
Implementation Method 1
The light source may include an optical emitter, such as a light emitting diode (LED), configured to emit light
Implementation Method 2
A scattering medium may be positioned between the optical emitter and the partially reflective layer. The scattering medium may be configured to scatter the emitted light
Implementation Method 3
A partially reflective layer may be positioned at or adjacent to the output aperture of the light source. The partially reflective layer may be configured to reflect a portion of the scattered light
Data Source
AI summary
A light source includes an optical emitter configured to emit light toward an output aperture of the light source. The light source further includes a partially reflective layer at the output aperture. The partially reflective layer is configured to receive the emitted light from the optical emitter and to reflect a portion of the received light as reflected light. The light source additionally includes a scattering medium located between the partially reflective layer and the optical emitter. The scattering medium is configured to scatter the reflected light as scattered light having a different direction from the reflected light. A portion of the scattered light is redirected toward the partially reflective layer as recycled light to be emitted from the light source. A multiview backlight that employs the light source is also provided, along with a method for operating the light source.