Backlight Module Light Receiving Structure for Privacy Display
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Solution Overview
Problem
Conventional viewing angle adjustable privacy display technologies suffer from low light energy utilization and low contrast, making them unsuitable for mobile devices and providing poor display effects.
Innovation Solution
A backlight module is designed with a light source divided into a first and second light-emitting assembly, a light receiving structure to concentrate light within a predetermined angle range, and a light guide structure for specular reflection, enhancing light energy utilization and contrast while allowing switchable viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If privacy films with blind micro structures or variable haze liquid crystal films are used to switch viewing angles, then viewing angle control is achieved, but light energy utilization is low and energy consumption is high
Solution Approach 1:
The light source is divided into multiple light-emitting units arranged in arrays, with each unit having a corresponding light receiving element. This segmentation allows selective activation of specific light-emitting units to achieve different viewing angle modes without requiring entire privacy films or liquid crystal layers to be activated, thereby reducing energy consumption while maintaining viewing angle control functionality.
2Adaptability or versatility
If third electrodes are provided in display panels to control viewing angle switching, then viewing angle switching is achieved, but front-view contrast is low and display effects are poor
Solution Approach 1:
Different light receiving elements are designed with different light-receiving surface shapes (e.g., planar vs. curved surfaces) to control light extraction in different directions. This local differentiation allows the display to achieve high front-view contrast when needed while maintaining viewing angle switching capability, resolving the contradiction between adaptability and illumination quality.
3Adaptability or versatility
If light is emitted in wide angles for privacy display, then viewing angle coverage is improved, but light energy utilization decreases
Solution Approach 1:
The system dynamically switches between different light-emitting units and light receiving element configurations to provide different viewing angle ranges as needed. Rather than continuously emitting light in all directions (which would waste energy), the system activates only the necessary light paths for the current privacy mode requirement, optimizing light energy utilization while maintaining adequate viewing angle coverage.
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 higher light energy utilization and contrast, and a privacy display effect with switchable viewing angles by concentrating light through the light receiving structure and directing it via specular reflection, improving display performance across different modes.
Implementation Method 1
a light-receiving curved surface disposed between the light incident surface and the light output surface, and configured to concentrate light incident on the light-receiving curved surface within the predetermined angle range so that the light is directed outward from the light output surface
Implementation Method 2
the light guide structure is configured to direct outward the light concentrated in the light receiving structure through specular reflection
Data Source
AI summary
A backlight module and a display device are disclosed. The backlight module includes a light guide structure and a light source. The light source includes a first light-emitting assembly and a second light-emitting assembly. A light receiving structure is disposed behind and corresponding to a position of the first light-emitting assembly and is configured to concentrate light emitted by the first light-emitting assembly within a predetermined angle range so that the light is directed outward from the light receiving structure. The light guide structure is disposed behind and corresponding to a position of the light receiving structure and is configured to direct outward the light concentrated in the light receiving structure through specular reflection.