Backlight Middle Frame Layout for Uniform Splicing Screen Edges
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Solution Overview
Problem
Existing direct-lit backlight modules in splicing screens suffer from darkened edges due to uneven light distribution, leading to poor display uniformity and increased thickness, which affects the overall display quality and cost efficiency.
Innovation Solution
A display module design incorporating a middle frame with a strip-shaped portion that overlaps with the optical element's edge, utilizing an acute or right angle to shield the edge and combine edge-lit and direct-lit backlight characteristics, featuring a light guide plate with auxiliary scattering structures and quantum dot film layers to enhance light uniformity and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-lit backlight module is used in a splicing screen, then the light source is directly arranged behind the display panel to form a surface light source, but darkened edges occur and display uniformity deteriorates
Solution Approach 1:
The patent segments the backlight module into multiple functional regions: a first region with a light guide plate for edge light guidance, and a second region with a diffusion plate for direct light distribution. This segmentation allows different areas to perform specialized functions, with the first region preventing edge darkening by guiding light from the sides and the second region providing uniform overall illumination, thereby resolving the contradiction between light distribution uniformity and display uniformity.
Solution Approach 2:
The patent applies local quality by providing different optical structures in different regions of the backlight module. The first region (edges) uses a light guide plate with specific refractive index and thickness to guide light horizontally, while the second region (center) uses a diffusion plate for direct light distribution. This localized optimization ensures that each region contributes to solving the edge darkening problem while maintaining overall display uniformity.
2Length of stationary object
If a direct-lit backlight module is used to reduce thickness, then the structure becomes thinner, but edge darkening occurs and display quality deteriorates
Solution Approach 1:
The backlight module is segmented into a first light guide region and a second diffusion region, allowing the thin profile to be maintained while the light guide plate in the first region efficiently guides light from the sides to prevent edge darkening. This segmentation enables the module to achieve reduced thickness without sacrificing edge brightness uniformity.
Solution Approach 2:
The patent transitions from traditional vertical light transmission to a combination of horizontal light guidance (in the light guide plate region) and vertical light distribution (in the diffusion plate region). This dimensional change allows light to be effectively distributed across the display area even in a thinner profile, preventing edge darkening while maintaining reduced thickness.
3Device complexity
If the middle frame does not overlap with the optical element edge, then the structure is simpler, but light and dark zones occur at the splicing screen edge
Solution Approach 1:
The middle frame's first strip-shaped portion acts as an intermediary structure that overlaps with the edge of the optical element. This intermediary structure serves as a light guiding path, enabling light from the light-emitting element to be effectively distributed to the edges of the display panel. By positioning the middle frame to overlap with the optical element edge, the patent prevents light and dark zones at splicing screen edges while maintaining reasonable structural complexity.
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 ensures uniform peripheral brightness, improves display quality, reduces splicing screen thickness, and lowers the cost of light-emitting elements by optimizing light distribution and utilizing quantum dot films for high color gamut.
Implementation Method 1
The working principle of the liquid crystal display panel is to apply a driving voltage to the color filter substrate and the TFT array substrate to control a rotation of liquid crystal molecules in the liquid crystal layer, and to refract light of the backlight module for display.
Implementation Method 2
In the edge-lit backlight module, an LED light bar used as a backlight source is arranged at an edge of a backplane at a rear side of the liquid crystal display panel, so that light emitted by the LED light bar enters a light guide plate (LGP) through a light incident surface at a side of the light guide plate, exits through a light emergent surface of the light guide plate after reflection and diffusion
Implementation Method 3
a surface of the light guide plate away from the display panel is provided with an auxiliary scattering structure, and the auxiliary scattering structure is configured to scatter light incident into the light guide plate
Implementation Method 4
the optical element further comprises a quantum dot film layer arranged at a side of the light guide plate close to the display panel
Data Source
AI summary
A display module and a display device are provided, the display module includes a backlight module and a display panel, which includes: a backplane, including a bottom plate and a side plate; an optical element arranged at a side of the bottom plate close to the display panel; a light-emitting element at a side of the side plate close to the optical element; a middle frame between the bottom plate and the display panel, the middle frame includes a first strip-shaped portion; a first included angle is formed between at least part of the first strip-shaped portion and a surface of the optical element close to the display panel; an orthographic projection of the first strip-shaped portion on the display panel at least overlaps with an orthographic projection of an edge of the optical element close to the light-emitting element on the display panel.