Display Module Middle Frame Overlap for Thin Uniform-Edge Backlighting
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Solution Overview
Problem
Existing liquid crystal display devices, particularly direct-lit splicing screens, suffer from darkened edges due to non-uniform light distribution, leading to poor display quality and increased thickness, with high costs from multiple light sources.
Innovation Solution
A display module design incorporating a middle frame with a strip-shaped portion that overlaps with the edge of an optical element, utilizing an acute or right angle to shield light edges, combined with a light guide plate and quantum dot film, ensuring uniform light distribution and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-lit backlight module is used with multiple light sources to illuminate the display panel, then the brightness coverage is improved, but the thickness of the splicing screen increases
Solution Approach 1:
The patent divides the backlight module into two distinct parts: an edge-lit section with light sources at the edges and a direct-lit section with light sources at the backplane. This segmentation allows each part to perform its function optimally while maintaining overall thinness, as the edge-lit portion requires minimal thickness for light guidance
Solution Approach 2:
The patent transitions from a conventional single-plane direct-lit structure to a hybrid structure that utilizes both edge positions and backplane positions for light source arrangement. This dimensional change in light source placement enables improved brightness coverage without proportionally increasing screen thickness
2Illumination intensity
If multiple light sources are arranged to cover the entire display area, then the illumination uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent applies different lighting strategies to different regions of the display: edge-lit technology is used at the periphery where light guidance is most effective, while direct-lit technology is used at the backplane for overall illumination. This local differentiation achieves uniform brightness without requiring light sources across the entire surface
Solution Approach 2:
The patent merges edge-lit and direct-lit backlight technologies into a single hybrid module, combining the advantages of both approaches. The edge-lit portion provides efficient light guidance with minimal thickness, while the direct-lit portion ensures comprehensive coverage, together achieving uniform illumination with reduced overall complexity
3Length of stationary object
If the light source is positioned close to the display panel to reduce thickness, then the splicing screen thickness is reduced, but light and dark zones appear at the edges
Solution Approach 1:
The patent segments the backlight function between the edge-lit and direct-lit portions, where the edge-lit section specifically addresses the peripheral illumination problem by placing light sources at the edges, ensuring uniform brightness at the boundaries while maintaining thin overall structure
Solution Approach 2:
The patent introduces a light guide plate as an intermediary component that receives light from the edge light sources and distributes it uniformly across the display area. This mediator enables the light to travel from the thin edge region to illuminate the entire panel evenly, including the previously problematic dark zones
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 peripheral brightness uniformity, enhances display quality, and reduces splicing screen thickness while minimizing the need for multiple light sources, thus lowering costs.
Implementation Method 1
a light guide plate and quantum dot film, ensuring uniform light distribution
Implementation Method 2
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 first strip-shaped portion included in a middle frame extends to be above an optical element from a position close to a display panel towards a position away from the display panel... so that the problem of light and dark zone occurred at an edge of a splicing screen
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.