Ambient-Light Backlight Module With Fiber Diffusion Uniformity
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Solution Overview
Problem
Conventional backlight modules for LCDs have poor color performance and high energy consumption due to the use of LEDs or CCFLs, which struggle to produce real colors and efficient light distribution.
Innovation Solution
A backlight module that collects ambient light using optical fibers, a fiber light-outputting substrate, and a light coupling device with diffusion recessions to distribute light evenly, reducing energy consumption and enhancing color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs or CCFLs are used as light sources in the backlight module, then the display can provide backlight for the liquid crystal display panel, but the color performance is poor and the color gamut is narrow
Solution Approach 1:
The invention utilizes ambient light (natural light from the environment) as the light source for the backlight module, eliminating the need for energy-consuming LEDs or CCFLs. The optical fibers collect and transmit this free ambient light to the light guide plate, which then provides backlight for the LCD panel, achieving self-service by using freely available environmental resources.
Solution Approach 2:
The invention introduces optical fibers as an intermediary medium to transfer light from the ambient environment to the light guide plate. The optical fibers act as a bridge that captures ambient light and delivers it to the display panel, enabling the system to use external light sources instead of internal energy-consuming light sources.
2Illumination intensity
If LEDs or CCFLs are used as light sources, then the backlight module can illuminate the liquid crystal display panel, but the energy consumption is high especially for large-size LCDs
Solution Approach 1:
The system uses ambient light from the environment as a free energy source, eliminating the need for power-consuming light sources. The optical fibers collect and transmit this ambient light to illuminate the display panel, making the system self-sufficient by utilizing freely available environmental light resources.
Solution Approach 2:
The invention extracts light from the ambient environment and redirects it to the light guide plate using optical fibers. By taking out light from the surrounding environment and utilizing it for backlight illumination, the system eliminates the need for energy-consuming internal light sources.
3Illumination intensity
If conventional light sources are used, then the backlight module can provide illumination, but the light distribution has hotspot issues and poor uniformity
Solution Approach 1:
The light coupling device incorporates light diffusion recessions with specific geometric features (first opening length larger than second opening length) that create localized light diffusion zones. These recessions are strategically positioned to receive light from optical fibers and diffuse it laterally, ensuring uniform light distribution at each local point before the light reaches the light guide plate, thereby eliminating hotspot issues.
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 significantly reduces energy consumption, improves color accuracy, and addresses hotspot issues by laterally diffusing light, resulting in better display quality and uniform illumination.
Implementation Method 1
a plurality of optical fibers connected to the light collector; a fiber light-outputting substrate connected to the optical fibers, wherein the fiber light-outputting substrate includes a plurality of light-outputting openings configured to output the light rays transmitted by the optical fibers
Implementation Method 2
a light coupling device disposed between the fiber light-outputting substrate and the light guide plate, wherein the light coupling device includes a plurality of light diffusion recessions, and the light diffusion recessions face the light-outputting openings of the fiber light-outputting substrate
Data Source
AI summary
The present invention provides a backlight module and a display apparatus. The display apparatus comprises the backlight module and a display panel. The backlight module comprises a light collector, optical fibers, a fiber light-outputting substrate, a light guide plate and a light coupling device. The optical fibers are connected between the light collector and the fiber light-outputting substrate. The light guide plate is disposed at one side of the fiber light-outputting substrate. The light coupling device is disposed between the fiber light-outputting substrate and the light guide plate, wherein light diffusion recessions of the light coupling device face the light-outputting openings of the fiber light-outputting substrate. The present invention can use ambient light rays to form a backlight source.