Multiview Backlight Mitigating Color Breakup via Fluorescent Multibeam Elements
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Solution Overview
Problem
Passive displays, such as LCDs and EP displays, lack the ability to emit light independently, limiting their practical applications and often require external light sources like backlights, which can lead to issues like color breakup due to the spatial displacement of color sub-pixels.
Innovation Solution
A multiview backlight system utilizing a fluorescent multibeam element with a color-tailored emission pattern, comprising a plurality of light beams with different principal angular directions and colors, is employed to provide directional light beams that correspond to various view directions of a multiview display, mitigating color breakup by ensuring the different color light beams have substantially the same principal angular direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional backlight with white light and color filters is used, then the display can show multiple colors, but color breakup occurs due to spatial displacement of color sub-pixels
Solution Approach 1:
The backlight is segmented into multiple independent light sources (red, green, blue LEDs) positioned at different locations. Each LED illuminates its corresponding color sub-pixels directly, eliminating the need for color filters and preventing color breakup by ensuring each color beam maintains its spatial integrity
Solution Approach 2:
Different regions of the backlight have different color characteristics - red LEDs are positioned to illuminate red sub-pixels, green LEDs for green sub-pixels, and blue LEDs for blue sub-pixels. This local color matching ensures each color channel is independently controlled and spatially aligned, preventing color breakup while maintaining manufacturing simplicity
2Use of energy by moving object
If passive displays are used to reduce power consumption, then energy efficiency is improved, but the displays cannot emit light independently
Solution Approach 1:
The display system combines passive display technology with an integrated LED backlight unit, creating a hybrid system that can operate in multiple modes. The passive display maintains low power consumption for image modulation, while the LED backlight provides independent light emission capability, making the display universally adaptable to both power-efficient and self-emissive operation modes
Solution Approach 2:
The LED backlight is positioned and configured in advance to provide pre-conditioned illumination to specific color sub-pixels. This preliminary light preparation occurs before the passive display modulates the light, enabling the passive display to function with enhanced light emission capability while maintaining its inherent power efficiency
3Ease of manufacture
If color filters are used to transform white light into various colors, then color display is achieved, but light intensity is reduced due to filtering losses
Solution Approach 1:
The color filtering stage is completely removed from the optical path. Instead of using white light and color filters, the system extracts and uses only the necessary color components by positioning red, green, and blue LEDs directly behind their corresponding color sub-pixels. This eliminates filtering losses and maximizes light transmission efficiency while maintaining color display capability
Solution Approach 2:
The system changes the fundamental parameter of light source color temperature and spectrum. Rather than using broad-spectrum white light that requires filtering, narrow-spectrum LEDs with specific wavelengths are used for each color channel. This parameter change eliminates the need for energy-lossy color filters while achieving superior color purity and transmission efficiency
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 multiview backlight system effectively addresses the limitations of passive displays by enabling them to emit light with a color-tailored pattern, reducing color breakup and enhancing the display's ability to provide clear, color-accurate images across different views.
Implementation Method 1
A multiview backlight may include a fluorescent multibeam element. The fluorescent multibeam element may be configured to provide emitted light including a plurality of light beams
Data Source
AI summary
Multiview backlighting employs a fluorescent multibeam element having a color-tailored emission pattern to provide directional light beams corresponding to a plurality of different views of a multiview image. A multiview backlight includes a light guide configured to guide light as guided light and a fluorescent multibeam element. The fluorescent multibeam element includes a fluorescent material and is configured to provide emitted light having a color-tailor emission pattern from the guided light. The emitted light includes a plurality of directional light beams having different principal angular directions corresponding to respective different view directions of a multiview display and the color-tailored emission pattern corresponds to an arrangement of color sub-pixels of a view pixel in the multiview display.