Backlight Module Light Shielding Member for Keyboard Hole Leak
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Solution Overview
Problem
Light keyboards with backlight modules often experience a light leak phenomenon due to holes in the light guide plate, which reduces their effectiveness in dark environments.
Innovation Solution
A backlight module design incorporating a light shielding member, such as portions of a light shielding sheet or an opaque washer, positioned within the hole of the light guide plate to block light emission, preventing leaks and enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hole is formed on the light guide plate for accommodating a pointing stick or fastening member, then the keyboard structure is simplified and assembly is easier, but light leaks from the hole causing light leak phenomenon
Solution Approach 1:
A light shielding member is introduced as an intermediary component to block light from leaking through the hole in the light guide plate. This member is disposed within the hole and has a light shielding portion that prevents light from the light source from escaping, thereby resolving the light leak issue while maintaining the structural simplicity and assembly ease provided by the hole.
2Object-generated harmful factors
If a light shielding member is added to block light from the hole, then light leak is prevented, but device complexity increases
Solution Approach 1:
Instead of shielding the entire light guide plate, the light shielding member is localized only at the hole position where light leakage occurs. The light shielding portion is specifically positioned within the hole to block light only where needed, maintaining transparency and light guidance functionality in other areas of the light guide plate, thus minimizing the increase in device complexity.
3Object-generated harmful factors
If the light shielding member covers the side wall of the hole, then light leak is effectively blocked, but manufacturing precision requirements increase
Solution Approach 1:
The light shielding member is segmented into a body portion and a light shielding portion, with the light shielding portion specifically designed to cover the side wall of the hole. This segmentation allows the light shielding function to be concentrated at the critical area (hole side wall) while the rest of the structure can be manufactured with standard precision, reducing overall manufacturing precision requirements.
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 effectively prevents light leaks from the holes in the light guide plate, ensuring consistent illumination and improved visual performance in dark conditions, thereby enhancing the user experience of light keyboards.
Implementation Method 1
The light source is disposed neighboring to the light guide plate and used for emitting light into the light guide plate, such that the light is guided by and emitted out of the light guide plate
Implementation Method 2
The light shielding member is disposed in the hole and covers the side wall of the hole, so as to block the light guided by the light guide plate from being emitted out of the hole
Implementation Method 3
The light reflecting sheet is disposed below the light guide plate
Data Source
AI summary
A backlight module includes a light guide plate, a light source, a light shielding sheet, a light reflecting sheet and a light shielding member. The light guide plate has a hole formed thereon and the hole has a side wall. The light source is disposed neighboring to the light guide plate and used for emitting light into the light guide plate. The light shielding sheet is disposed on the light guide plate. The light reflecting sheet is disposed below the light guide plate. The light shielding member is disposed in the hole and covers the side wall of the hole, so as to block the light guided by the light guide plate from being emitted out of the hole.