Folded Light Guide Plate for Thin Display Frame
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Solution Overview
Problem
Conventional side-in backlight modules for LCDs face limitations in thinning the display frame due to the size and positioning of LED light sources, which can lead to damage from thermal expansion of the light guide plate.
Innovation Solution
A backlight module design where the light guide plate has a bending portion with a light input end on the backplane's second surface, allowing the light source to be positioned on the same surface, reducing frame size and preventing damage by maintaining a safe distance during thermal expansion, while ensuring effective light transmission and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the light source bar and light guide plate are positioned close together on the same side to reduce frame size, then the frame thickness is reduced, but the light guide plate may squeeze or damage the light source after thermal expansion
Solution Approach 1:
The light guide plate is folded along a bending line to create a three-dimensional structure where the light input end is positioned on the rear surface of the backplane, separated from the light source in the Z-direction. This dimensional reconfiguration allows the light guide plate to maintain close proximity to the light source for compact framing while preventing thermal expansion damage through spatial separation.
2Use of energy by moving object
If the light source is positioned closer to the light guide plate to improve light output efficiency, then light transmission is enhanced, but the risk of damage from thermal expansion increases
Solution Approach 1:
By folding the light guide plate and positioning the light input end on the rear surface, the design achieves close proximity for efficient light coupling while using the Z-dimension to maintain a safety buffer against thermal expansion forces.
Solution Approach 2:
The bending portion of the light guide plate incorporates curved surfaces that facilitate smooth light transmission while the folded geometry creates inherent structural spacing to prevent direct contact between the light guide plate and light source during thermal expansion.
3Length of moving object
If the frame is thinned to achieve a narrower display module, then the overall size is reduced, but the structural space to accommodate light source protection is limited
Solution Approach 1:
The folded light guide plate utilizes the Z-dimension (depth) to achieve light source separation, allowing the front frame to remain thin while the rear structure accommodates the folded configuration and maintains protective spacing.
Solution Approach 2:
The bending portion of the light guide plate is positioned within the depth of the backplane structure, nesting the folded section into the available space without increasing the overall front frame thickness.
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 narrower frame size, protects the light source from damage, and improves light output efficiency by allowing smooth light entry and reducing direct reflections, thus enhancing the structural stability and light guide effect of the backlight module.
Implementation Method 1
utilizing the extension space of the backplane... effectively reduce the thickness or frame size... ensures the installation stability and relative positions
Data Source
AI summary
Disclosed are a backlight module and a display device. The backlight module includes a backplane, a light guide plate and a light source. The backplane includes a first surface and a second surface opposite to the first surface. The light guide plate includes a light output portion provided on the first surface and a bending portion provided with a light input end on the second surface, and an end of the light output portion facing the second surface of the backplane is bent and extended to form the bending portion. The light source is provided on the second surface and corresponds to a light input end face of the light input end.