Backlight Module Laser Array Optical Echo-Wall Microcavity
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Solution Overview
Problem
Laser backlight modules in display technology suffer from poor backlight uniformity and limited viewing angle, resulting in a suboptimal display effect.
Innovation Solution
A backlight module comprising a light-emitting unit, a laser array with red and green laser generators featuring an optical echo-wall mode microcavity, a prism sheet, and a diffusion sheet, where the blue laser excites the red and green lasers, which are then mixed to produce a white laser, improving uniformity and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If laser backlight module is used, then energy saving and long service life are achieved, but backlight uniformity is poor
Solution Approach 1:
The patent segments the laser backlight into multiple independent laser elements (red, green, and blue laser generators) that can be individually controlled. This segmentation allows each laser element to be precisely managed, improving overall backlight uniformity while maintaining the energy efficiency of laser technology.
Solution Approach 2:
The patent applies local quality by using different laser elements (red, green, blue) in specific regions or combinations to achieve uniform backlight distribution. The selective arrangement and control of different wavelength lasers address local uniformity issues while preserving global energy efficiency.
2Use of energy by moving object
If laser backlight module is used, then energy saving is achieved, but viewing angle is limited
Solution Approach 1:
The patent merges multiple laser generators (red, green, blue) into a single backlight module, combining their light output to create a broader viewing angle while maintaining the energy efficiency of individual laser elements. The combined light from multiple sources provides better angular distribution.
Solution Approach 2:
The patent uses composite laser materials and optical structures that combine different laser wavelengths and optical properties. This composite approach enables the backlight to maintain laser energy efficiency while achieving improved viewing angles through the combined optical characteristics of multiple laser types.
3Ease of manufacture
If simple laser structure is used, then manufacturing is easier, but display effect is poor
Solution Approach 1:
The patent segments the display system into distinct laser generators (red, green, blue) that can be manufactured separately using established laser fabrication techniques. This segmentation maintains manufacturing simplicity for each component while enabling superior display effects through their combined operation.
Solution Approach 2:
The patent employs universal laser generator designs that can produce multiple wavelengths or are easily configured for different colors. This multi-functionality approach maintains ease of manufacture by using standardized laser components while achieving excellent display effects through versatile color generation and combination.
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 backlight uniformity and viewing angle, leading to an improved display effect by effectively mixing blue, red, and green lasers into a white output.
Implementation Method 1
the light-emitting unit is configured to emit a blue laser and irradiates the red laser generator and the green laser generator with the blue laser, the red laser generator and the green laser generator excite the red laser and the green laser
Implementation Method 2
the red laser, the blue laser, and the green laser are mixed by the prism sheet and the diffusion sheet to emit a white laser
Data Source
AI summary
A backlight module and a display device are provided. A blue laser is emitted by a light emitting unit of the backlight module, and a red laser generator and a green laser generator included in the laser array with an optical echo-wall mode microcavity are disposed on the light-emitting unit, so that the backlight formed by the laser array has a larger viewing angle and higher backlight uniformity.