Backlight Module Light Guide Plate Inclined Grooves
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Solution Overview
Problem
Traditional collimated-backlight designs for display devices often require multiple light sources or increased module thickness to achieve the desired optical effect, which limits their performance in terms of thinness and resolution.
Innovation Solution
A backlight module with an edge-light design that uses a collimated light source and a light guide plate with inclined surfaces and grooves to distribute and reflect light, reducing the number of light sources needed while maintaining collimation, and incorporating a housing to absorb stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional collimated backlight designs use optical films over light sources to adjust collimation, then collimated backlight is achieved, but module thickness increases
Solution Approach 1:
The patent transitions from a direct-type backlight configuration to an edge-light configuration, changing the spatial dimension of light delivery. Light is introduced through the side surface of the light guide plate rather than from below, allowing collimation to be achieved through the inclined surface geometry rather than through additional optical films, thus reducing module thickness while maintaining collimated backlight performance
2Illumination intensity
If traditional collimated backlight designs use multiple light sources to achieve desired optical effect, then collimated backlight is achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple light sources into a single light guide plate structure. The light guide plate integrates light guidance, distribution, and collimation functions through its inclined surface geometry, eliminating the need for multiple separate light sources and associated optical components, thereby reducing device complexity while achieving the desired collimated backlight effect
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
This design achieves a collimated backlight with fewer light sources, enhancing optical performance and reducing module thickness, suitable for thin and high-resolution display devices.
Implementation Method 1
After entering the light guide plate from the light entrance surface, the collimated light may be reflected from a position on different first light receiving surfaces close to the first end to leave the light guide plate through the top surface, thereby forming collimated backlight
Data Source
AI summary
A display device and a backlight module thereof are provided. The backlight module includes a collimated light source and a light guide plate. The collimated light source configured to generate a collimated light. The light guide plate has a bottom surface and a top surface opposite to each other, and a light entrance surface connected to ends of the bottom and top surfaces respectively for receiving collimated light from the collimated light source. The bottom surface inclines toward the top surface from the end of the bottom surface connected to the light entrance surface. A plurality of first grooves are disposed side by side on the bottom surface and respectively extend along the light entrance surface. The first groove has a first light receiving surface with a first end extending toward the top surface and inclining away from the light entrance surface. Compared to the first end of the first light receiving surface closer to the light entrance surface, the first end of the first light receiving surface farther from the light entrance surface has a vertical projection position on the light entrance surface that is closer to the top surface.