Prism Optical Film Assembly for Privacy Backlight Contrast Control
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Solution Overview
Problem
Existing display devices face issues with high energy consumption, high cost, low yield, and poor light package stability due to the use of privacy films and inadequate optical film assembly, which also fail to achieve high contrast and low side lobe.
Innovation Solution
A backlight device comprising a substrate with a light emitting component and multiple optical films with prism structures arranged at specific angles to concentrate light towards the front viewing angle without additional privacy films, using a configuration that includes a first optical film with a first prism structure extending along a first direction, a second optical film with a second prism structure extending along a second direction, and a third optical film with a third prism structure extending along a third direction, with included angles between these directions ranging from 30 to 150 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a privacy film is attached to achieve concentrated light source and privacy effect, then privacy protection is improved, but energy consumption increases and cost increases
Solution Approach 1:
The patent extracts the privacy protection function from the external privacy film and integrates it into the backlight device itself through the optical film assembly with prism structures. This eliminates the need for separate privacy films, reducing additional energy consumption and cost while maintaining privacy protection效果
Solution Approach 2:
The patent combines multiple functions (light concentration, privacy protection, and optical diffusion) into a single integrated optical film assembly with multiple prism structures, replacing the separate privacy film attachment and reducing overall system complexity and energy overhead
2Object-affected harmful factors
If a privacy film is attached to achieve concentrated light source, then privacy effect is improved, but manufacturing cost increases and yield decreases
Solution Approach 1:
The patent merges the privacy protection function with the backlight device manufacturing process itself. The optical film assembly with specific prism structures is integrated during backlight device assembly, eliminating the need for separate privacy film attachment processes and improving manufacturing yield
Solution Approach 2:
The patent incorporates privacy protection features into the backlight device design from the outset. The optical films with predetermined prism structures are pre-configured during backlight device manufacturing, eliminating later privacy film attachment steps and associated yield losses
3Ease of manufacture
If optical films are assembled with standard configurations, then assembly is simplified, but light package stability decreases due to low tolerance for assembly errors
Solution Approach 1:
The patent employs asymmetric prism structures with specific geometric parameters (different heights, widths, and angles) that create a self-aligning optical path. This asymmetric design provides inherent tolerance to assembly variations while maintaining stable light packaging performance
Solution Approach 2:
The patent optimizes specific geometric parameters of the prism structures (height, width, angle) to achieve optimal light concentration and stability. These parameter optimizations provide a buffer against assembly errors while maintaining manufacturing simplicity
4Illumination intensity
If additional privacy films or collimated backlight modules are used to achieve high contrast and low side lobe, then display quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines light concentration, contrast enhancement, and side lobe suppression functions into a single integrated optical film assembly with multiple prism structures. This eliminates the need for separate privacy films or collimated backlight modules, reducing device complexity while achieving high contrast
Solution Approach 2:
The optical film assembly with multiple prism structures performs multiple functions simultaneously: concentrating light, enhancing contrast, suppressing side lobes, and providing privacy protection. This multi-functional design replaces multiple separate components, simplifying the overall optical system
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 achieves high contrast and reduces side lobe without the need for additional privacy films or collimated backlight modules, thereby optimizing energy efficiency and reducing costs while maintaining privacy requirements.
Implementation Method 1
a first optical film disposed on the substrate and provided with a first prism structure extending along a first direction; a second optical film disposed on the first optical film and provided with a second prism structure extending along a second direction
Data Source
AI summary
A backlight device includes a substrate, a light emitting component, a first optical film, a second optical film and a third optical film. The light emitting component is disposed on the substrate. The first optical film is disposed on the substrate, and includes a first prism structure extending along a first direction. The second optical film is disposed on the first optical film, and includes a second prism structure extending along a second direction. The third optical film is disposed on the second optical film, and includes a third prism structure extending along a third direction. An included angle between the first direction and the second direction is substantially between 30 degrees and 150 degrees, and the second direction is substantially parallel to the third direction.