Backlight Module Light Guide Plate Prisms Microstructures
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Solution Overview
Problem
Existing backlight devices, such as edge-lit type backlights, face challenges in providing a proper surface light source due to the disposition of structures like V-cut structures on light guide plates, which can result in patterns on display devices, affecting the directivity and uniformity of the light source.
Innovation Solution
A backlight module with a light guide plate featuring prisms and microstructure groups on its bottom surface, where the prisms extend along a first direction and the microstructures connect adjacent prisms, with ridgelines parallel to a second direction, enhancing light-emitting efficiency and avoiding pattern formation in the surface light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If V-cut structures are disposed on the light guide plate to enhance directivity of surface light source, then light directionality is improved, but extra patterns emerge on the display device
Solution Approach 1:
The light guide plate is segmented into multiple regions with different microstructure types (first microstructures, second microstructures, and third microstructures) arranged in alternating patterns. This segmentation allows different areas to perform different functions: some regions enhance directivity while others suppress pattern formation, thereby resolving the contradiction between improving light directionality and preventing extra patterns on the display device.
Solution Approach 2:
Different microstructures are applied to different locations on the light guide plate bottom surface. The first microstructures (e.g., V-cut structures) are placed in regions where directivity enhancement is needed, while second and third microstructures are placed in regions where pattern suppression is critical. This local differentiation allows each region to optimize its function without causing harmful patterns elsewhere.
2Productivity
If large structures are used on the light guide plate to enhance light transmission, then light-emitting efficiency is improved, but corresponding patterns emerge on the display device pictures
Solution Approach 1:
Instead of using a single large structure, the light guide plate employs multiple smaller microstructures of different types arranged in alternating sequences. This segmentation maintains high light-emitting efficiency through cumulative effect while the varied sizes and shapes prevent the formation of large-scale patterns that would be visible on the display device.
Solution Approach 2:
The patent employs asymmetric microstructure designs where the first, second, and third microstructures have different geometries, orientations, and dimensions. This asymmetry disrupts the formation of regular patterns on the display device while still maintaining effective light extraction and emission efficiency.
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 enhances the directivity and uniformity of the surface light source, improving the brightness and contrast of images displayed, while preventing the emergence of extra patterns or spots, thus providing a more proper and uniform light distribution.
Implementation Method 1
The prisms are disposed on the bottom surface. The microstructure groups include microstructures, and the microstructures respectively connect two of the prisms adjacently disposed
Implementation Method 2
the microstructure groups on the bottom surface can avoid the surface light source provided by the light-emitting surface emerging patterns corresponded to the prisms, so as to improve directivity and uniformity of the surface light source
Data Source
AI summary
A backlight module including a plurality of first light-emitting devices and a light guide plate is provided. The light guide plate includes light-emitting surface, bottom surface and a first light-receiving side. The bottom surface is corresponded to the light-emitting surface, and the first light-receiving side connects the light-emitting surface and the bottom surface. The first light-emitting devices are disposed on the first light-receiving side, arranged along a first direction. The light guide plate further includes a plurality of prisms and a plurality of microstructure groups. The prisms are disposed on the bottom surface and extend along the first direction. The microstructure group includes microstructures, and the microstructures are respectively connecting two of the prisms adjacently disposed. Each of the microstructures has a ridgeline, and the ridgeline is parallel to a second direction, which is different from the first direction. A manufacture method of a light guide plate is also provided.