Backlight Module Space-Keeping Structure Suppresses Bright Lines
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Solution Overview
Problem
Backlight modules of side-entrance type display devices suffer from bright lines at side edges due to the narrow width of light-shielding tape, leading to poor image quality.
Innovation Solution
A backlight module design featuring a plastic frame with space-keeping structures at the side edges, where a first step groove provides increased spacing between the light guiding plate and a cover structure, such as adhesive tape, to absorb and reflect light, reducing bright lines and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the width of the light-shielding tape is reduced to achieve a narrow frame, then the frame width is reduced, but bright lines are generated at the side region causing poor image quality
Solution Approach 1:
The patent introduces a space-keeping structure as an intermediary element between the light guiding plate and the side edge of the frame. This structure includes a groove that creates a controlled air gap, acting as a mediator to manage light behavior in the previously problematic side region, thereby eliminating bright lines while maintaining the narrow frame design
Solution Approach 2:
The patent transitions from managing light primarily in the horizontal plane to utilizing the vertical dimension by creating a groove with depth. This three-dimensional space-keeping structure allows light to be managed through vertical spacing and reflection paths, effectively controlling side-edge brightness without increasing overall frame width
2Object-generated harmful factors
If the space-keeping structure increases the optical path length to reduce bright lines, then the structural complexity increases
Solution Approach 1:
The space-keeping structure utilizes a thin groove feature integrated into the light guiding plate or frame structure. This thin-film approach creates the necessary optical path extension through a shallow groove rather than a bulky three-dimensional structure, maintaining simplicity while achieving the desired light management effect
Solution Approach 2:
The patent merges the space-keeping function directly into the existing light guiding plate or frame structure by integrating the groove feature. Rather than adding a separate component, the groove is formed as part of the existing structural elements, thereby reducing overall device complexity while still achieving bright line suppression
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 design effectively reduces bright lines at side edges, enhancing image-display quality by increasing the optical path of light and ensuring a smooth, strong adhesive bonding for improved structural strength and optical effect.
Implementation Method 1
a portion of the light existing from the end surface of the light guiding plate is absorbed by the cover structure
Implementation Method 2
another portion is reflected by the cover structure and then reenters into the light guiding plate
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a plastic frame and a light guiding plate provided within the plastic frame. For each non-incident side of two parallel non-incident sides of the plastic frame, a respective space-keeping structure is provided at an end of a side edge on the non-incident side, with the end of the side edge on the non-incident side being close to a side edge of an incident side; and a side of the space-keeping structure that is away from an end surface of the light guiding plate is sealed with a cover structure. The present arrangement can effectively reduce bright lines at side edges occurring in the backlight module, and thus improve image-display quality of the backlight module.