Backlight Prism Structure for Tailored Light Distribution
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Solution Overview
Problem
Current display assemblies fail to effectively direct light within a desired viewing envelope, leading to excessive light emission outside this range, causing glare and safety concerns, especially in aircraft cockpits, and existing solutions like privacy films and fiber optic faceplates are either ineffective or prohibitively expensive.
Innovation Solution
A display assembly incorporating a backlight module with a prism structure in the light guide that directs light rays from a light source to a display panel, ensuring that most light is emitted within a predetermined viewing envelope through strategic prism placement and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional backlight modules are used, then light is provided to illuminate the display panel, but light is emitted in unwanted directions causing glare and safety concerns
Solution Approach 1:
The backlight module is segmented into multiple independent light sources (first, second, third light sources) positioned at different locations (first, second, third positions) to provide light from multiple directions. This segmentation allows each light source to be independently controlled to illuminate specific regions of the display panel, enabling precise control over light distribution and viewing angles to eliminate glare while maintaining illumination intensity.
2Object-affected harmful factors
If privacy films are used to control light direction, then light emission outside viewing envelope is reduced, but the solution is ineffective
Solution Approach 1:
A reflective layer is introduced as an intermediary component between the light sources and the display panel. This reflective layer reflects light from the multiple light sources at controlled angles, directing it toward the display panel while preventing light from escaping in unwanted directions. The reflective layer acts as a mediator that achieves effective light direction control without relying on privacy films, thereby improving both light confinement and viewing angle control reliability.
3Illumination intensity
If fiber optic faceplates are used to direct light, then light distribution is improved, but the solution is prohibitively expensive
Solution Approach 1:
The invention replaces expensive fiber optic faceplates with inexpensive conventional light sources (such as LEDs) positioned at multiple locations behind the display panel. These affordable light sources, combined with simple reflective layers, achieve effective light distribution and viewing angle control without the high manufacturing costs associated with fiber optic technology, making the solution economically viable while maintaining performance.
4Illumination intensity
If light is emitted in all directions, then maximum luminance is achieved, but stray light causes safety concerns in aircraft cockpits
Solution Approach 1:
Different regions of the display assembly are provided with different light sources positioned at different locations and orientations. The first, second, and third light sources are strategically positioned to illuminate specific areas of the display panel, creating localized light emission patterns. This local quality approach ensures that light is emitted with appropriate intensity for viewing while directing it away from unwanted areas, thereby maintaining luminance levels while eliminating stray light that could cause safety concerns in aircraft cockpit environments.
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 provides a tailored angular distribution of light, minimizing stray light emission and reducing glare, while maintaining desired luminance levels and reducing power consumption by directing stray light towards the viewer, thus enhancing display performance and safety.
Implementation Method 1
the prism structure is configured for causing substantially all light rays included in the plurality of light rays to be emitted from the display assembly via the display panel into a pre-determined viewing envelope
Data Source
AI summary
The present invention is a display assembly including: a display and a backlight module, the backlight module including a prism structure. The backlight module generates light rays and directs the light rays to the display for illuminating the display. The prism structure of the backlight module is configured for causing the light rays to be directed to the display and for causing substantially all of the light rays to be emitted from the display assembly via the display into a pre-determined viewing envelope (ex.—towards an eye position of a viewer of the display.