Backlight Module with Privacy Film for Switchable Viewing Angles
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Solution Overview
Problem
Existing display devices struggle with complex manufacturing processes and inadequate privacy protection, failing to meet varying user needs for wide or narrow viewing angles.
Innovation Solution
A backlight device comprising a first and second backlight device with a privacy film, allowing for a privacy operating state and a sharing operating state, utilizing a substrate, composite brightness enhancement film, and a privacy film to control light emission angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a grating layer is incorporated into the backlight device to block light at wide front-back viewing angles, then privacy protection is improved, but manufacturing complexity increases and machining costs increase
Solution Approach 1:
The patent extracts the privacy protection function from a complex grating layer structure and implements it through a simple privacy film with light-shielding strips. This separates the privacy function from the complex manufacturing process, achieving privacy protection through a straightforward assembly of existing components (privacy film, light-shielding strips, and backlight devices) rather than through complex grating layer fabrication.
Solution Approach 2:
The patent replaces the expensive and complex grating layer with a cost-effective privacy film that can be easily applied. The privacy film uses simple light-shielding strips that are inexpensive to manufacture and apply, significantly reducing machining costs while maintaining the essential privacy protection function.
2Object-affected harmful factors
If a grating layer is incorporated into the backlight device to block light at wide front-back viewing angles, then privacy protection is improved, but the privacy protection effect is generally not satisfactory
Solution Approach 1:
The patent applies light-shielding strips at specific locations within the privacy film to create localized light-blocking zones. These strips are strategically positioned to block light at wide front-back viewing angles while preserving other necessary light transmission properties, achieving satisfactory privacy protection through localized light-shielding rather than uniform blocking.
Solution Approach 2:
The patent uses a composite structure combining the privacy film with light-shielding strips made of light-shielding material. This composite approach integrates the privacy film's base properties with the light-shielding strips' light-blocking capability, creating a synergistic effect that achieves satisfactory privacy protection better than either component alone.
3Adaptability or versatility
If the display device is required to have a wide viewing angle for sharing information, then sharing capability is improved, but privacy protection is compromised
Solution Approach 1:
The patent implements a dynamic viewing angle control system where the backlight device can switch between different operating states. By controlling the light sources and adjusting the privacy film's light-shielding strips, the system can dynamically change its viewing angle characteristics - providing wide viewing angles for sharing when needed and narrow viewing angles for privacy when required.
Solution Approach 2:
The patent creates a multi-functional backlight device that can serve multiple purposes: it can provide wide viewing angles for information sharing, narrow viewing angles for privacy protection, and can operate in different modes (first backlight device, second backlight device, both, or neither). This universal design allows a single device to adapt to different usage scenarios without requiring separate 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
Provides effective privacy protection with adjustable viewing angles, enhancing user privacy while maintaining low manufacturing costs and ease of production.
Implementation Method 1
the composite brightness enhancement film is provided on the light-emitting surface A and is configured to diffuse and collimate light
Implementation Method 2
the composite brightness enhancement film is provided on the light-emitting surface A and is configured to diffuse and collimate light
Implementation Method 3
the privacy film is arranged between a light-emitting side of the composite brightness enhancement film and the light guide surface B, and the privacy film is configured to cooperate with the first backlight device and the second backlight device to provide the backlight device with a privacy operating state and a sharing operating state
Implementation Method 4
the first light guide plate has a light-incident surface B, and a light guide surface B and a light-emitting surface B which are disposed back-to-back and both adjacent to the light-incident surface B
Data Source
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AI summary
Disclosed are a backlight device and a display device. The backlight device includes a first backlight device, a second backlight device and a privacy film. The first backlight device includes a substrate, a first light source and a composite brightness enhancement film. The substrate is made of a light-transmitting material and has a light-incident surface A and a light-emitting surface A. The first light source is arranged adjacent to the light-incident surface A, and the composite brightness enhancement film is provided on the light-emitting surface A. The second backlight device includes a first light guide plate and a second light source. The first light guide plate has a light-incident surface B, and a light guide surface B and a light-emitting surface B which are disposed back-to-back and both adjacent to the light-incident surface B. The second light source is arranged adjacent to the light-incident surface B.