Display Backlight Light Source Segmentation for Function-Area Dark Zones
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Solution Overview
Problem
Light leakage in function-adding areas of display devices due to light from backlight sources entering these areas, affecting the performance of additional functions such as photo-taking.
Innovation Solution
A display device with a backlight module and display panel, where light sources are divided into first and second groups, with the first light groups turned off and second light groups turned on to create a dark zone that prevents light from entering the function-adding area, using optical films with specific light-emitting angles and configurations to achieve this.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are uniformly distributed across the backlight module, then the display area receives sufficient illumination, but light enters the function-adding areas causing light leakage
Solution Approach 1:
The light sources are divided into multiple groups (first light groups and second light groups) with different control characteristics. The first light groups have wider light-emitting angles for general illumination, while the second light groups have narrower angles for targeted lighting. This segmentation allows selective control of different light groups to prevent light leakage in function-adding areas while maintaining sufficient illumination in the display area.
Solution Approach 2:
Different regions of the backlight module are assigned different light-emitting characteristics. The first light groups positioned near function-adding areas have smaller light-emitting angles to avoid illuminating these regions, while other areas maintain broader illumination. This local differentiation of light-emitting properties prevents light leakage in specific function-adding areas while preserving overall display illumination.
2Area of stationary object
If light-emitting angles of all light groups are increased to improve coverage, then more display area is illuminated, but light leakage in function-adding areas worsens
Solution Approach 1:
The light sources are segmented into first light groups with larger light-emitting angles for broad area coverage and second light groups with smaller angles for localized illumination. By selectively controlling which groups are active and at what intensity, the system achieves wide area illumination without causing light leakage in function-adding areas.
Solution Approach 2:
The light-emitting angles of different light groups are set to different parameter values. The first light groups have larger light-emitting angles to cover broader display areas, while the second light groups have smaller angles to avoid function-adding areas. This parameter differentiation allows the system to achieve both wide illumination coverage and prevention of light leakage simultaneously.
3Illumination intensity
If light sources are positioned closer to function-adding areas to improve display brightness, then display quality improves, but light leakage into function-adding areas increases
Solution Approach 1:
Light sources positioned near function-adding areas (first light groups) are configured with smaller light-emitting angles to restrict their illumination away from these sensitive regions. Other light sources can be positioned and configured for optimal display brightness. This local optimization of light-emitting characteristics allows proximity positioning without causing light leakage.
Solution Approach 2:
The light-emitting angles of light groups near function-adding areas are set to smaller values compared to other light groups. This parameter adjustment allows these light sources to be positioned closer to function-adding areas to improve display brightness while their narrower beam angles prevent light from entering the function-adding areas.
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
Prevents light leakage in function-adding areas, enhancing the performance of additional functions by ensuring excellent anti-light leakage performance, thereby improving photo-taking quality and other functions.
Implementation Method 1
The light sources include first light groups and second light groups. When the display device is in a functional mode, the first light groups are turned off, the second light groups are turned on, a first dark zone is formed on the optical film set
Implementation Method 2
The optical film set includes at least one optical film. The light sources are disposed on at least one end of the optical film set that is perpendicular to the light-emitting side of the backlight module
Data Source
AI summary
A display device has a main display area and a function-adding area and includes a backlight module and a display panel. The backlight module includes an optical film set and light sources. The light sources are disposed on at least one end of the optical film set that is perpendicular to a light-emitting side of the backlight module, and include first light groups and second light groups. When the display device is in a functional mode, the first light groups are turned off, the second light groups are turned on, a first dark zone is formed on the optical film set, and the function-adding area is located within the first dark zone.