Double-Layer Backlight Module for Clear Touch Recognition
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Solution Overview
Problem
The challenge in touch function row (TFR) modules is the inability to immediately recognize whether the correct icon has been successfully pressed due to icons being smaller than a user's finger, leading to uncertainty in touch recognition.
Innovation Solution
A backlight module with a double-layer light guide structure that includes multiple light guide sheets and sheets with microstructures, allowing for independent display of three light effects within a limited space, including an indicating light effect to confirm touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If icons are arranged at equal distances on the TFR module, then the layout is uniform and organized, but the icons become smaller than a user's finger making it impossible to immediately recognize correct touch recognition
Solution Approach 1:
The patent implements a feedback mechanism by providing a separate indication light (third light output path) that confirms whether a touch has been successfully recognized. When a user touches an icon, the corresponding indication light illuminates to provide immediate visual feedback, resolving the problem of uncertain touch recognition caused by small icon size.
Solution Approach 2:
The patent segments the light guide structure into multiple independent light guide sheets (first, second, and third light guide sheets) with separate light output paths. This segmentation allows the indication function to be independently controlled and displayed, separating the icon display function from the touch confirmation function, thereby enabling clear touch feedback without requiring larger icons.
2Adaptability or versatility
If a double-layer light guide structure with multiple light guide sheets is used, then three light effects can be independently displayed within limited space, but the device structure becomes more complex
Solution Approach 1:
The patent combines multiple light guide sheets and light-emitting elements into an integrated double-layer light guide structure. The first and second light guide sheets are positioned at different layers, with corresponding light-transmitting portions aligned to create composite light effects. This merging approach enables three independent light effects (first, second, and third light output paths) within a compact space, achieving high adaptability while managing structural complexity through systematic integration.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking light guide sheets at different layers (first layer and second layer). The light-transmitting portions are positioned at different heights but aligned horizontally, creating three distinct light output paths through vertical layering. This dimensional approach allows independent control of multiple light effects without increasing horizontal footprint, enhancing versatility within limited space.
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 provides clear confirmation of touch recognition by ensuring the indicating light effect is visible even if the primary light effect is blocked by a finger, enhancing user interaction clarity.
Implementation Method 1
a first light guide sheet, a second light guide sheet, and a third light guide sheet... The first light guide sheet is disposed in the first light-isolating area. The second light guide sheet is disposed in the second light-isolating area.
Implementation Method 2
The first light guide sheet has a first microstructure group. The first microstructure group is disposed correspondingly to the first light-transmitting window and the third light-transmitting window to form the first light output path.
Data Source
AI summary
A backlight module includes a base layer having first, second, and third openings, first and second light-isolating sheets, first, second, and third light guide sheets, and first and second light-shielding sheets. The first light-isolating sheet is disposed above the base layer and has first and second light-isolating areas and a fourth opening. The first and second light guide sheets are disposed in the first and second light-isolating areas respectively. The first light-shielding sheet is disposed above the first light-isolating sheet and has first and second light-transmitting windows and a fifth opening. The third, fourth, and fifth openings are disposed correspondingly. The second light-isolating sheet is disposed above the first light-shielding sheet and has a third light-isolating area in which the third light guide sheet is disposed. The second light-shielding sheet is disposed above the second light-isolating sheet and has third, fourth, and fifth light-transmitting windows.