Prism-Sheet Dimming Assembly Balancing Brightness and Viewing Angle
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Solution Overview
Problem
Conventional backlight modules using DBEFs fail to meet the visual angle requirements of the TCO 8.0 standard while striving for higher brightness.
Innovation Solution
A dimming assembly comprising two prism sheets with specific cutting angles and haze values, along with an auxiliary film like DBEF, is employed to balance brightness and viewing angle requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If DBEF is added to backlight module to improve brightness, then brightness is improved, but viewing angle becomes insufficient
Solution Approach 1:
The patent divides the single prism sheet into two separate prism sheets with different cutting angles. The first prism sheet has a cutting angle of 0° and the second prism sheet has a cutting angle of 45°, allowing each sheet to contribute differently to light distribution. This segmentation enables simultaneous optimization of brightness (through the 0° sheet) and viewing angle (through the 45° sheet) without compromising either parameter.
Solution Approach 2:
Different regions of the optical path are assigned different optical properties through the two prism sheets with distinct cutting angles. The first prism sheet (0°) provides localized brightness enhancement in the normal viewing direction, while the second prism sheet (45°) provides localized light distribution to oblique viewing angles. This local quality differentiation resolves the contradiction between brightness and viewing angle by optimizing each region for its specific function.
2Device complexity
If conventional backlight module design is used to simplify structure, then device complexity is reduced, but brightness enhancement is insufficient
Solution Approach 1:
The patent combines two prism sheets with different cutting angles (0° and 45°) into a single integrated dimming assembly that works synergistically with the DBEF. This merging approach achieves superior brightness enhancement (comparing favorably with traditional DPP structures) while maintaining relatively simple structure, as the two prism sheets are integrated into one functional unit rather than requiring separate complex optical systems.
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 ensures compliance with TCO 8.0 viewing angle standards while achieving high brightness gains.
Implementation Method 1
The first prism sheet has a first surface and a second surface which are opposite to each other, wherein the first surface includes a plurality of first dimming portions extending in a first direction and arranged in an array. The second prism sheet has a third surface and a fourth surface which are opposite to each other, wherein the third surface is located on a side of the second prism sheet close to the first prism sheet, and the third surface includes a plurality of second dimming portions extending in a second direction and arranged in an array.
Implementation Method 2
an auxiliary film located on a side of the first prism sheet away from the second prism sheet
Data Source
AI summary
A dimming assembly includes a first prism sheet and a second prism sheet disposed oppositely, and an auxiliary film on a side of the first prism sheet away from the second prism sheet. The first prism sheet includes multiple first dimming portions extending in a first direction and arranged in an array. The second prism sheet includes multiple second dimming portions extending in a second direction and arranged in an array. An included angle between the third direction and the first direction is a first cutting angle, and an included angle between the third direction and the second direction is a second cutting angle. An absolute value of the second cutting angle is greater than an absolute value of the first cutting angle, and the absolute values of the first cutting angle and the second cutting angle are greater than or equal to 0 and less than 90 degrees.