Keyboard Backlight Module Structure for Blocking Light Leakage
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Solution Overview
Problem
Light leakage occurs in keyboard devices due to the design of the backlight module, where light beams easily escape through hollow portions and slots, compromising the ability to provide distinct luminous effects to different key regions.
Innovation Solution
A light leakage prevention mechanism is implemented using a light guide plate with a slot divided into blocks, accompanied by a light-sheltering layer, a reflecting layer, and an opaque structure. The opaque structure is strategically placed between the light-sheltering layer and the reflecting layer to block light beams that attempt to leak out, ensuring that light remains within the designated blocks and preventing cross-block illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the backlight module is provided with a hollow portion for allowing a positioning post to pass through, then the keyboard device can be integrated into another electronic device, but the light beam easily leaks out from the hollow portion
Solution Approach 1:
The patent extracts the light-blocking function from the existing structure by introducing a separate light-blocking layer and light-blocking posts. The light-blocking posts are positioned at the hollow portion to specifically block light leakage without interfering with the positioning post's integration function, thus separating the integration capability from the light leakage problem.
Solution Approach 2:
The patent introduces light-blocking posts as intermediary elements positioned at the hollow portion of the light guide plate. These posts act as mediators between the positioning post and the light beam, allowing the positioning post to pass through while the light-blocking posts prevent light leakage from the same hollow portion.
2Adaptability or versatility
If the light guide plate comprises plural slots to provide different luminous effects to different regions, then different blocks can cooperate with different light-emitting units, but the light beam readily leaks out of the slots to the adjacent blocks
Solution Approach 1:
The patent extracts the light-blocking function from the slot structure by introducing light-blocking posts that extend into the slots from the light-blocking layer. This separates the light-guiding function of the slots from the light-blocking function, allowing the slots to maintain their luminous effect differentiation while preventing light leakage to adjacent blocks.
Solution Approach 2:
The light-blocking posts serve as intermediary elements positioned within the slots of the light guide plate. These posts act as mediators that prevent direct light transmission between adjacent blocks while allowing each block to maintain its independent luminous effect from its corresponding light-emitting unit.
3Object-generated harmful factors
If a light leakage prevention mechanism is added to block light beams, then light leakage is prevented, but the structure becomes more complex
Solution Approach 1:
The patent merges the light-blocking posts with the existing hollow portion structure of the light guide plate. The light-blocking posts are positioned to utilize the same spatial location as the hollow portions, combining the positioning function with the light-blocking function in a integrated manner rather than adding completely separate structures.
Solution Approach 2:
The light-blocking layer and light-blocking posts serve multiple functions: they block light leakage from hollow portions, block light leakage from slots between blocks, and maintain the structural integrity of the backlight module. This multi-functionality reduces the need for additional separate components.
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 mechanism effectively prevents light leakage from the openings of the backlight module, maintaining the desired luminous effects and enhancing the light guide capability while maintaining the surface flatness of the keyboard device.
Implementation Method 1
The opaque structure is located beside the lateral wall of the light guide plate. Moreover, a portion of the light beam leaking out of the lateral wall is blocked by the opaque structure.
Data Source
AI summary
A keyboard device includes a key module and a backlight module. The key module includes a supporting plate and plural key structures. The key structures are installed on the supporting plate. The backlight module includes a light guide plate, a light-sheltering layer, a reflecting layer, a light-emitting unit, a base plate and an opaque structure. The light guide plate includes a second opening. The second opening includes a lateral wall. The light-sheltering layer is located over the light guide plate. The light-sheltering layer includes a third opening. The reflecting layer is located under the light guide plate. The reflecting layer includes a fourth opening. The light-emitting unit emits a light beam into the light guide plate. The opaque structure is arranged between the light-sheltering layer and the reflecting layer. The opaque structure is located beside the lateral wall of the light guide plate.