Optical Film Set Light-Guiding Structures Front-Viewing Luminance
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Solution Overview
Problem
Existing display devices achieve limited front-viewing luminance gain due to the lack of optical coordination between diffusing sheets and prism sheets, resulting in inefficient light gathering and distribution.
Innovation Solution
An optical film set is introduced, comprising a base with light-guiding structures that have included angles between their surfaces and the normal of the light entrance surface, ranging from greater than 0 degrees to less than 25 degrees, to effectively manage and redirect light for improved luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusing sheet and prism sheet are configured to achieve front-viewing luminance gain, then luminance gain is improved, but the optical coordination between sheets is insufficient resulting in limited performance
Solution Approach 1:
The patent merges the diffusing sheet and prism sheet into a single integrated optical film structure. The light-guiding structures are directly formed on the base sheet, eliminating the need for separate prism sheets and achieving coordinated optical function in one component. This integration resolves the contradiction by simplifying the structure while maintaining effective optical coordination for luminance gain.
Solution Approach 2:
The optical film structure performs multiple functions simultaneously: the base sheet provides mechanical support and light transmission, while the light-guiding structures on its surface provide both light guidance and diffusion functions. This multi-functionality eliminates the need for separate specialized components, achieving effective optical coordination without increasing device complexity.
2Illumination intensity
If light-guiding structures with small included angles are used, then front-viewing luminance is improved, but light gathering efficiency is reduced
Solution Approach 1:
The patent applies different optical characteristics to different regions of the optical film. The light-guiding structures have specific included angles (greater than 0 and less than 25 degrees) optimized for front-viewing luminance enhancement, while the base sheet provides uniform light transmission. This local optimization allows the structure to achieve high front-viewing luminance without requiring large included angles that would reduce light gathering efficiency.
Solution Approach 2:
The patent optimizes the included angle parameter of the light-guiding structures to a specific range (greater than 0 and less than 25 degrees). This parameter change balances two competing requirements: small enough angles to maintain front-viewing luminance enhancement, but large enough to ensure adequate light gathering efficiency. The optimization resolves the contradiction by finding the optimal parameter value that satisfies both conditions.
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 optical film set enhances front-viewing luminance by maintaining the traveling direction of front-viewing light and redirecting oblique light towards the front-viewing direction, resulting in a significant luminance gain compared to conventional display devices.
Implementation Method 1
The first light-guiding structures are disposed on the first light entrance surface of the first base. Each of the first light-guiding structures includes two first light-guiding surfaces opposite to each other. A first included angle is between each of the two first light-guiding surfaces and a normal of the first light entrance surface
Implementation Method 2
maintain the travelling direction of front-viewing (zero AOV) light of a backlight source, and cause oblique light of the backlight source to approach in a front-viewing direction
Data Source
AI summary
An optical film set is disclosed. The optical film set including an optical film. The optical film includes a base and multiple light-guiding structures. The base has a light entrance surface and a light exit surface opposite to each other. The light-guiding structures are disposed on the light entrance surface of the base. Each of the light-guiding structures has two light-guiding surfaces opposite to each other. An included angle is between the each of the two light-guiding surfaces and a normal of the light entrance surface, and an angle range of the included angle is larger than 0 degrees and less than 25 degrees. A display device having the optical film set is also disclosed.