Segmented Backlight Module With Reflective Film Halo Control
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Solution Overview
Problem
Existing liquid crystal display backlight modules, whether side-type or direct-type, fail to provide optimal image region display contrast due to uniform light source activation and wide diffusion causing halos, especially in highlighted objects against black backgrounds, and do not effectively adjust brightness based on image regions.
Innovation Solution
A backlight module with a substrate divided into light emitting regions, each containing light source assemblies with reflective films that split light towards the center, using tapered surfaces and optionally including diffusion and prism films to enhance light mixing and minimize crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-type backlight module is used with uniformly arranged light sources, then uniform illumination on the display panel is achieved, but a large-range halo is formed when a single region is lit, reducing local display contrast
Solution Approach 1:
The backlight module divides the light source array into multiple independent light source groups, where each group corresponds to a specific display region. This segmentation allows selective activation of light source groups based on image requirements, preventing halos from spreading across the entire panel while maintaining uniform illumination within active regions.
Solution Approach 2:
Different light source groups are configured with different optical characteristics tailored to their specific display regions. The light mixing units and optical films are optimized locally to control light distribution patterns, ensuring uniform illumination where needed while minimizing halo effects in specific areas.
2Length of stationary object
If a side-type backlight module is used with a light guide plate, then the module achieves lightness and thinness, but all light sources must be always turned on to ensure uniform light emission, preventing brightness adjustment based on image regions
Solution Approach 1:
The backlight module adopts a segmented light source structure where multiple independent light source groups can be selectively activated. This allows the system to maintain the thin profile of side-type modules while enabling region-specific brightness control, as only the light source groups corresponding to active display regions need to be turned on.
Solution Approach 2:
The backlight module implements dynamic control of light source groups based on image content requirements. The system can adjust which light source groups are active and at what intensity levels, providing adaptability for different display scenarios while maintaining the compact thinness of the module structure.
3Illumination intensity
If the diffusion range of the light source is increased to improve uniformity, then better overall illumination is achieved, but a large-range halo is formed, reducing local display comparison effect
Solution Approach 1:
The light mixing unit is designed with a segmented structure that corresponds to the segmented light source groups. Each segment controls the diffusion of light from its associated light sources, allowing light to spread uniformly within the intended region while being contained to prevent halo formation in adjacent regions. This segmentation enables both uniform illumination and precise local contrast control.
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
Improves light mixing and reduces halos, providing better image contrast and brightness control, while facilitating module miniaturization through optimized light distribution and reduced thickness.
Implementation Method 1
a reflective film configured to split light emitted by the light emitting unit
Implementation Method 2
The light is scattered by using the light guide plate, and the light is gradually coupled and emitted uniformly to form a surface light source
Data Source
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AI summary
A backlight module (1) and a display screen are disclosed. The backlight module (1) is applied to a display apparatus, and is configured to provide light to the display apparatus. The backlight module (1) includes a substrate (20) and light source assemblies. The substrate (20) has a plurality of light emitting regions (21), and the plurality of light emitting regions (21) are arranged in an array. There are a plurality of light source assemblies, and the plurality of light source assemblies are disposed in the plurality of light emitting regions (21) in a one-to-one correspondence. Each light source assembly includes a plurality of light source members (31) arranged in an array. Each light source member (31) includes a light emitting unit (311), and a reflective film (313) configured to split light emitted by the light emitting unit (311). When the reflective film (313) is disposed, the following condition needs to be met: A proportion of light split by the reflective film (313) towards a center of the light emitting region (21) gradually increases in a direction from the center to an edge of the light emitting region (21) in which the light source member (31) is located. In this way, light emitted by the light source assembly has good light mixing effect in the light emitting region (21). This improves light emitting effect of the backlight module (1). In addition, light splitting is performed by using the reflective film (313), facilitating miniaturization of the backlight module (1).