Edge-Lit Backlight Module Polarizer Linear Light Transmittance
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Solution Overview
Problem
Current liquid crystal display (LCD) technologies face challenges in achieving high light transmittance, leading to poor transparent display effects due to significant light loss, especially when trying to show images and real scenes simultaneously, as existing materials have reached their transmittance limits, and increasing transmittance results in high costs.
Innovation Solution
An edge-lit backlight module is designed with a light guide plate, polarizers, and scattering particles to convert light into linearly polarized light, which is then used in conjunction with a polarization analyzer, allowing for improved light utilization and transmittance, enabling clearer image display while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight modules are used, then light is provided for the liquid crystal display panel, but light transmittance is low and transparent display effect is poor
Solution Approach 1:
The patent changes the optical parameters of the system by introducing polarizers and using linearly polarized light. The polarizers convert unpolarized light from the backlight into linearly polarized light, and the polarization analyzer in conjunction with the liquid crystal panel enables high transmittance when the polarization directions are aligned, achieving excellent transparent display effect without significant light loss.
2Illumination intensity
If materials are optimized to increase transmittance, then light transmittance improves, but cost increases significantly
Solution Approach 1:
Instead of using expensive high-transmittance materials, the patent changes the optical parameter regime by utilizing polarization. This approach uses conventional materials but arranges them in a polarization-based optical system (polarizer + liquid crystal panel + polarization analyzer) that achieves high transmittance through optical configuration rather than material properties, thereby avoiding significant cost increase.
3Weight of moving object
If edge-lit backlight module structure is used, then the module becomes lighter and thinner, but light distribution uniformity becomes more difficult to achieve
Solution Approach 1:
The patent maintains the edge-lit structure for lightness and thinness while using polarization-based light control to achieve uniform light distribution. The polarizers and polarization analyzers enable precise control of light transmission, compensating for the inherent non-uniformity of edge-lit structures and achieving both structural advantages and optical uniformity.
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 light transmittance and utilization, allowing viewers to see both images and real scenes clearly behind the LCD, while reducing costs by optimizing the use of materials and improving the display's transparent effect.
Implementation Method 1
The at least one polarizer is configured to convert light emitted from a light source disposed on a side of the polarizer away from the light guide plate into the light guide plate into linearly polarized light
Implementation Method 2
edge-lit backlight modules use a light guide plate with side faces, wherein a polarizer is disposed opposite to a side face of the light guide plate
Data Source
AI summary
An edge-lit backlight module (7) includes a light guide plate (71), at least one polarizer (72) and at least one light source (73). The light guide plate (71) has side faces (71a). A polarizer (72) is disposed opposite to a side face (71a) of the light guide plate (71). A light source (73) is disposed on a side of a polarizer (72) away from the light guide plate (71). The at least one polarizer (72) is configured to convert light emitted from a light source (73) disposed on a side of the polarizer away from the light guide plate to the light guide plate (71) into linearly polarized light.