Backlight Module With Dual-Directional Prism Films
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Solution Overview
Problem
Current backlight module structures do not optimize light-emitting angles, resulting in suboptimal brightness and luminous intensity.
Innovation Solution
A backlight module design incorporating a light guiding element with optical microstructures and a brightness enhancement component, including two perpendicular prism structures, to converge light-emitting angles and enhance luminous intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight module structure is used, then the structure is simple, but the brightness and luminous intensity are insufficient
Solution Approach 1:
The brightness enhancement component is divided into two separate brightness enhancement films, each with prism structures oriented in different directions (first direction and second direction perpendicular to each other). This segmentation allows each film to independently control light in specific directions, achieving comprehensive light convergence and brightness enhancement while maintaining manageable structural complexity
Solution Approach 2:
The patent introduces a new dimensional aspect by adding prism structures in two perpendicular directions rather than relying on a single directional control mechanism. This dual-directional approach adds optical control capability in multiple dimensions, significantly improving brightness enhancement without proportionally increasing structural complexity
2Illumination intensity
If high gain BEF with high refractive index material is used, then brightness increases by about 10%, but the structure is still not optimized for optimal brightness
Solution Approach 1:
The patent applies different optical properties to different parts of the system by using two brightness enhancement films with prism structures oriented in different directions. Each film is positioned and oriented to address specific light distribution needs in different spatial directions, achieving localized optical optimization that conventional single-film structures cannot provide
Solution Approach 2:
The patent changes the optical parameters of the brightness enhancement component by introducing dual-directional prism structures with specific angular orientations. This parameter change enables precise control over light-emitting angles in multiple directions, optimizing brightness distribution beyond what single-directional structures or conventional high gain BEF can achieve
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 design achieves a significant brightness gain of at least 1.45 times compared to general backlight module dispositions by optimizing light-emitting angles and overall luminous intensity.
Implementation Method 1
the light guide plate, due to a total internal reflection characteristic thereof, can transmit the light to the other end of the light guide plate
Implementation Method 2
the light guide plate, due to a total internal reflection characteristic thereof, can transmit the light to the other end of the light guide plate. Furthermore, in order to allow the light to be emitted from a top surface of the light guide plate
Implementation Method 3
a high gain brightness enhancement film (high gain BEF) with a material having a high refractive index has been used
Implementation Method 4
When the light incidents the dots on the bottom surface, reflected light spreads to different angles, so the light may be emitted from the top surface of the light guide plate
Data Source
AI summary
A backlight module including a light source, a light guiding element, a brightness enhancement component, and a reflecting part is provided. A plate body of the light guiding element has an upper surface, a lower surface, and a light incident surface. A plurality of optical microstructures of the light guiding element are formed on the lower surface. The brightness enhancement component is disposed on a side of the upper surface. The brightness enhancement component includes two brightness enhancement films having a plurality of prism structures and disposed perpendicular to each other. The reflecting part is disposed on a side of the lower surface in the light guiding element. Each of the optical microstructures has a light receiving surface and a shady surface, and an angle between the light receiving surface and the lower surface is ranged between 2 degrees and 12 degrees.