Backlight Module Light Guide Plates Turning Film
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Solution Overview
Problem
Current switchable backlight modules for display devices are costly, thick, and inefficient in light use, leading to insufficient brightness and increased energy consumption due to the use of optical films like prism sheets and privacy filters.
Innovation Solution
A simplified backlight module structure comprising a first and second light guide plate, a turning film, and multiple light source modules that can switch between anti-peep and sharing modes, reducing the need for optical films by using a turning film with a prismatic surface and optical microstructures on the light guide plates to control light direction and divergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical films such as prism sheets and privacy filters are used to guide viewing angle and block light, then the anti-peep mode and sharing mode switching is achieved, but the manufacturing cost increases and the thickness of the backlight module increases
Solution Approach 1:
The patent removes traditional optical films (prism sheets and privacy filters) from the backlight module structure. Instead, it uses a turning film with prismatic surface and optical microstructures formed directly on the light guide plate to achieve the same light guiding and viewing angle control functions, thereby reducing the overall thickness and complexity of the module.
Solution Approach 2:
The patent combines multiple functions into integrated components: the turning film with prismatic surface and optical microstructures performs both light guiding and viewing angle control that were previously handled by separate optical films. The light guide plate itself is designed with both light guiding structures and optical microstructures, merging multiple functional layers into fewer integrated components.
2Adaptability or versatility
If optical films such as prism sheets and privacy filters are disposed between light guide plates, then viewing angle control is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the need for expensive optical films like prism sheets and privacy filters. The viewing angle control function is achieved through a turning film with prismatic surface and optical microstructures formed on the light guide plate, which are less costly to manufacture and assemble.
Solution Approach 2:
The patent changes the approach from using separate optical films with specific optical parameters to forming optical microstructures directly on the light guide plate and using a turning film with prismatic surface. This parameter change in the structural design reduces manufacturing complexity and cost while maintaining the required viewing angle control functionality.
3Adaptability or versatility
If optical films such as privacy filter are used to block light with large viewing angle, then anti-peep mode is achieved, but light use efficiency decreases resulting in insufficient brightness and higher power consumption
Solution Approach 1:
The patent removes the privacy filter optical film that caused light blocking and efficiency loss. Instead, it uses a turning film with prismatic surface and optical microstructures on the light guide plate to redirect light at specific angles, achieving the anti-peep effect without blocking light and maintaining high light use efficiency.
Solution Approach 2:
The patent converts the potential harm of light scattering (which would reduce brightness) into a beneficial directed light distribution. The optical microstructures and turning film redirect scattered light into useful viewing angles, transforming what would be wasted light into effective illumination that maintains brightness while enabling anti-peep functionality.
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 reduces manufacturing costs, improves image brightness, and extends service time by optimizing light use efficiency and reducing energy consumption while maintaining privacy and sharing mode functionality.
Implementation Method 1
a turning film, wherein the turning film has a prismatic surface
Implementation Method 2
a second light guide plate... and a plurality of optical microstructures
Implementation Method 3
a light guide structure is formed on the first bottom surface
Data Source
AI summary
A backlight module includes a first and a second light guide plate; a turning film; a first, a second, and a third light source module. The first light guide plate has a first light entrance surface, a first light-emitting surface, a first bottom surface, and a light guide structure formed on the first bottom surface. The second light guide plate is disposed above the first light-emitting surface and has a second light-emitting surface, a second bottom surface, a second light entrance surface, a third light entrance surface, and optical microstructures, wherein the second and the third light entrance surface are located on two opposite sides of the second light guide plate. The turning film is disposed between the two light guide plates. The first, the second, and the third light source module are disposed aside the first, the second, and the third light entrance surface, respectively.