Dual Viewing-Angle Backlight Module for Local Anti-Peep
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Solution Overview
Problem
Existing display apparatuses lack a local anti-peep function, which is necessary for secure operations such as local sharing between multiple users, and current anti-peep functions are limited to the entire screen.
Innovation Solution
A backlight module with a substrate controlling first and second light-emitting devices to achieve different viewing angles, allowing for a sharing state, fully anti-peep state, and local anti-peep state by adjusting the emission states of these devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional backlight module with uniform light emission is used, then the display provides consistent illumination across all viewing angles, but it cannot achieve local anti-peep functionality for privacy protection
Solution Approach 1:
The backlight module is divided into multiple independent light-emitting regions (first light-emitting devices and second light-emitting devices) that can be controlled separately. This segmentation enables different regions to emit light at different viewing angles, achieving local anti-peep functionality while maintaining manageable structural complexity through modular organization
Solution Approach 2:
Different regions of the backlight module are assigned different light emission characteristics. The first light-emitting devices emit light at a first viewing angle while the second light-emitting devices emit light at a second viewing angle. This local differentiation enables specific areas to provide anti-peep protection while other areas maintain normal visibility, resolving the contradiction between functionality and complexity
2Adaptability or versatility
If multiple light-emitting devices with different viewing angles are integrated, then viewing angle control and anti-peep functionality are achieved, but the device structure becomes more complex
Solution Approach 1:
The backlight module integrates multiple light-emitting devices that serve multiple functions: the first light-emitting devices provide light for normal viewing while the second light-emitting devices provide light for anti-peep protection. Both device types share the same backlight module structure and can be controlled through a unified control system, achieving viewing angle control without proportionally increasing overall complexity
Solution Approach 2:
The patent combines multiple light-emitting devices with different viewing angle characteristics into a single integrated backlight module. By merging these devices and sharing common structural elements and control mechanisms, the design achieves versatile viewing angle control while minimizing the increase in overall device complexity
3Adaptability or versatility
If the backlight module supports multiple display states (sharing, fully anti-peep, local anti-peep), then functionality and adaptability are improved, but control complexity increases
Solution Approach 1:
The backlight module employs dynamic control of the light-emitting devices to achieve different display states. The control system can dynamically adjust which light-emitting devices are active and at what viewing angles, enabling transitions between sharing state, fully anti-peep state, and local anti-peep state. This dynamic approach provides versatility while keeping the control system manageable through algorithmic control rather than complex hardware
4Adaptability or versatility
If light is emitted at multiple viewing angles simultaneously, then both sharing and anti-peep functions are achieved, but light distribution and uniformity become more difficult to control
Solution Approach 1:
The light-emitting devices are segmented into distinct groups (first and second light-emitting devices) with different viewing angle characteristics. This segmentation allows independent control of light distribution for each group, enabling simultaneous multi-functionality while maintaining light distribution uniformity through separate optimization and control of each segment
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
Enables secure local sharing and anti-peep functionality by controlling light emission from different viewing angles, ensuring privacy and visibility as needed.
Implementation Method 1
a light guide plate, a substrate, a plurality of first light-emitting devices, a plurality of second light-emitting devices, and a prism sheet. The light guide plate has a bottom surface and a light exit surface that are disposed oppositely
Implementation Method 2
The prism sheet is located on a side of the light guide plate away from the substrate. The plurality of first light-emitting devices are configured to emit first light, so that the first light passes through the light guide plate and the prism sheet to become light of a first viewing angle. The prism sheet is configured to cooperate with the light guide plate to modulate second light emitted by the plurality of second light-emitting devices into light of a second viewing angle
Data Source
AI summary
A backlight module includes a light guide plate having a bottom surface, a light exit surface, and a light incident surface a substrate located on a side of the bottom surface away from the light exit surface; first light-emitting devices located on a side of the substrate proximate to the bottom surface second light-emitting devices disposed opposite to the light incident surface; and a prism sheet located on a side of the light guide plate away from the substrate. The first light-emitting devices are configured to emit first light, so that the first light passes through the light guide plate and the prism sheet to become light of a first viewing angle. The prism sheet is configured to cooperate with the light guide plate to modulate second light emitted by the second light-emitting devices into light of a second viewing angle which is smaller than the first viewing angle.