Backlight Module Prism Sheet Angle Optimization
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Solution Overview
Problem
Current backlight modules face challenges in achieving high collimation and reducing light at large viewing angles due to the high cost and low shielding properties of reverse prisms, as well as the difficulty in adjusting the full width at half maximum (FWHM) of emitted light, which affects the optical quality and visual effect.
Innovation Solution
A backlight module design incorporating a light output module, a first prism sheet with first prism structures extending in a specific direction, and a second prism sheet with second prism structures extending in a different direction, where the angle between the two directions is less than or equal to 30 degrees, to enhance refraction, reflection, and diffraction, thereby focusing light and improving brightness and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reverse prism is used to achieve collimated light output with FWHM within 40 degrees, then the light collimation is improved, but the cost increases and the shielding property becomes low
Solution Approach 1:
The patent divides the single reverse prism function into multiple prism sheets (first prism sheet with first prism structures and second prism sheet with second prism structures). Each prism sheet provides partial light control function, and together they achieve the desired collimation effect with better cost-performance ratio and shielding properties.
Solution Approach 2:
The patent introduces a new dimension by using multiple layers of prism structures with different extending directions instead of a single reverse prism. The first prism structures extend in a first extending direction while the second prism structures extend in a second extending direction, creating a multi-dimensional light control system that improves both collimation and shielding.
2Device complexity
If single reverse prism is used for light output, then the structure is simple, but the shielding property is low and defects cause light path bias
Solution Approach 1:
The patent segments the light control function into multiple prism sheets, where each sheet provides redundant light path control. This segmentation improves shielding property because defects in one prism sheet can be compensated by the other sheets, reducing light path bias and improving reliability.
Solution Approach 2:
The patent applies different prism structure configurations in different regions (first prism structures in one orientation, second prism structures in another orientation) to create localized light control zones. This allows each region to contribute to overall shielding, making the system more robust against local defects.
3Manufacturing precision
If conventional optical films are used to adjust FWHM, then the light collimation can be improved, but the halo effect occurs and visual quality deteriorates
Solution Approach 1:
The patent uses multiple prism sheets with different extending directions to control light in multiple dimensions simultaneously. This multi-dimensional approach adjusts FWHM and improves collimation without creating the halo effect that occurs with conventional single-direction optical films, as the light is controlled more uniformly across different angular ranges.
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 proposed design reduces light at large viewing angles and enhances light collimation, improving the overall brightness and uniformity of the backlight module while reducing the halo effect and enhancing visual quality.
Implementation Method 1
the first prism sheet and the second prism sheet provide some optical effects, such as refraction, reflection, scattering and/or diffraction, etc., the emitted light is focused within a certain range of viewing angle
Implementation Method 2
the first prism sheet and the second prism sheet provide some optical effects, such as refraction, reflection, scattering and/or diffraction, etc., the emitted light is focused within a certain range of viewing angle
Implementation Method 3
the first prism sheet and the second prism sheet provide some optical effects, such as refraction, reflection, scattering and/or diffraction, etc., the emitted light is focused within a certain range of viewing angle
Implementation Method 4
the first prism sheet and the second prism sheet provide some optical effects, such as refraction, reflection, scattering and/or diffraction, etc., the emitted light is focused within a certain range of viewing angle
Data Source
AI summary
A backlight module including a light output module, a first prism sheet, and a second prism sheet is provided. The light output module has a light output surface. The first prism sheet is disposed on the light output surface of the light output module. The first prism sheet has a plurality of first prism structures extending in a first extending direction. The second prism sheet is disposed on the first prism sheet. The second prism sheet has a plurality of second prism structures extending in a second extending direction. The angle between the first extending direction and the second extending direction is less than or equal to 30 degrees.