Backlight Module Viewing Angle Switch Assembly
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Solution Overview
Problem
Conventional viewing angle adjustment and anti-peep display technologies in liquid crystal display devices suffer from low light energy utilization and high power consumption, as well as poor contrast at front viewing angles, making them unsuitable for mobile devices.
Innovation Solution
A backlight module comprising a light source assembly, a light concentration structure that emits light in a predetermined angle range, a light guide structure that guides light through mirror reflection, and a viewing angle switch assembly that adjusts the viewing angle, enhancing light energy utilization and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an anti-peep film of shutter microstructure and liquid crystal film with variable haze are added between backlight module and display panel, then viewing angle switching is achieved, but light energy utilization rate is low and power consumption is high
Solution Approach 1:
The patent extracts the viewing angle control function from the display panel and relocates it to the backlight module. By placing the viewing angle switch assembly in the backlight module, the display panel can maintain its original structure without requiring additional liquid crystal films or variable haze layers, thereby reducing power consumption while achieving viewing angle switching capability.
Solution Approach 2:
The patent introduces a light guide structure as an intermediary component between the light source and display panel. This light guide structure, combined with the viewing angle switch assembly, mediates the light path to achieve viewing angle control without requiring the display panel itself to perform the switching function, thus improving light energy utilization.
2Adaptability or versatility
If a third electrode is added in the display panel to control switching of viewing angle, then viewing angle switching is achieved, but contrast at front viewing angle is low and display effect is poor
Solution Approach 1:
The patent extracts the viewing angle control function from the display panel and relocates it to the backlight module. By placing the viewing angle switch assembly in the backlight module, the display panel can maintain its original structure without requiring additional electrodes or complex control layers, thereby preserving high contrast at front viewing angles while achieving viewing angle switching capability.
Solution Approach 2:
Instead of controlling viewing angle from the display panel side (forward approach), the patent inverts the control location to the backlight module side (backward approach). This inversion allows the viewing angle switch assembly to control light emission angles before the light reaches the display panel, maintaining excellent display quality and contrast.
3Adaptability or versatility
If viewing angle adjustment structure is added to achieve anti-peep display, then viewing angle control is achieved, but light energy utilization is low
Solution Approach 1:
The patent designs the light guide structure with continuous reflective surfaces that guide light from the light source through the viewing angle switch assembly to the display panel. This continuous light path minimizes energy loss and ensures that light energy is utilized efficiently throughout the entire optical path, maintaining high light energy utilization while achieving viewing angle control.
Solution Approach 2:
The patent replaces traditional mechanical shutter mechanisms with an optical-based viewing angle switch assembly that uses light reflection and guidance principles. This substitution eliminates mechanical energy losses and improves overall light energy utilization by using optical fields rather than mechanical movements to control viewing angles.
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 enables a display device with a switchable viewing angle, higher light energy utilization, and improved contrast, addressing the limitations of conventional technologies.
Implementation Method 1
a light concentration structure disposed along a light exiting direction of the light source assembly, and concentrating light emitted from the light source assembly
Implementation Method 2
a light guide structure disposed along a light exiting direction of the light concentration structure, and guiding and emitting the light concentrated by the light concentration structure outward in a way of mirror reflection
Implementation Method 3
guiding and emitting the light concentrated by the light concentration structure outward in a way of mirror reflection out from a light exiting surface of the light guide structure
Implementation Method 4
a viewing angle switch assembly disposed along a light exiting direction of the light guide structure, and guiding the light emitted from the light guide structure outward at a first viewing angle or a second viewing angle
Data Source
AI summary
The present application discloses a backlight module and a display device. The backlight module includes a light source assembly, a light concentration structure concentrating light emitted from the light source assembly and emitting the light in a predetermined angle range, a light guide structure guiding the light concentrated by the light concentration structure in a way of mirror reflection out from a light exiting surface of the light guide structure, and a viewing angle switch assembly, wherein the viewing angle switch assembly guides light emitted from the light guide structure outward at a first viewing angle or a second viewing angle.