Light Emitting Touchpad Spacing Blocks for Signal Consistency
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Solution Overview
Problem
Conventional light emitting touchpads face misjudgment issues due to inconsistent recessed levels caused by adhesive application, leading to varying touch sensing signal intensities and increased misjudgment rates.
Innovation Solution
The light emitting touchpad device incorporates a configuration of first and second spacing blocks on the light guiding plate, arranged in complementary intervals within nil-light spot areas, ensuring uniform surface recession and consistent touch sensing signals, while reducing light energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is applied in full range of light guide film, then surface evenness is maintained and touch sensing consistency is improved, but light emission efficiency is degraded due to optical dot effect
Solution Approach 1:
The adhesive application area is segmented into two distinct zones: a first adhesive application area covering the non-light-emitting region and a second adhesive application area covering the light-emitting region. This segmentation allows different adhesive application strategies for different functional areas, resolving the contradiction between maintaining surface evenness and preserving light emission efficiency.
Solution Approach 2:
Different adhesive application characteristics are applied to different local regions: the first adhesive application area uses full-range adhesive application to ensure surface evenness and touch sensing consistency, while the second adhesive application area uses selective adhesive application to maintain light emission efficiency. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Loss of energy
If adhesive is applied only along periphery of light emitting area, then light emission efficiency is maintained, but surface recessed level inconsistency increases causing touch control misjudgment
Solution Approach 1:
The adhesive application is segmented into two distinct areas with different application patterns. The first area (non-light-emitting) uses full-range adhesive application to maintain surface evenness, while the second area (light-emitting) uses periphery-only adhesive application to preserve light emission efficiency. This segmentation resolves the contradiction by applying the appropriate adhesive strategy to each functional zone.
Solution Approach 2:
The solution applies different adhesive application qualities to different local regions: full-range adhesive application in the non-light-emitting region for surface stability, and periphery-only adhesive application in the light-emitting region for optical performance. This local quality differentiation simultaneously achieves both surface evenness and light emission efficiency.
3Ease of manufacture
If different recessed levels exist at different positions, then adhesive application flexibility is improved, but touch sensing signal intensity varies causing misjudgment rate to increase
Solution Approach 1:
The adhesive application is segmented into two distinct patterns applied to different regions. The first pattern (full-range adhesive in non-light-emitting area) ensures uniform surface recessed levels and consistent touch sensing signals, while the second pattern (periphery-only adhesive in light-emitting area) provides manufacturing flexibility and preserves optical performance. This segmentation resolves the contradiction between manufacturing ease and measurement precision.
Solution Approach 2:
Different adhesive application qualities are applied locally: full-range adhesive application in the non-light-emitting region ensures surface uniformity and signal consistency, while periphery-only adhesive application in the light-emitting region provides manufacturing flexibility. This local differentiation simultaneously achieves both ease of manufacture and touch sensing precision.
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 configuration enhances the accuracy of touch control systems by generating consistent touch sensing signals and improves light emission efficiency by minimizing light loss.
Implementation Method 1
a light emitting component disposed adjacent to the light guiding plate and configured to emit light toward the light guiding plate
Implementation Method 2
an effect similar to optical dots would be produced (that is, the conditions for total inner reflection of light propagating within the film are changed)
Data Source
AI summary
The present disclosure discloses a light emitting touchpad device including a circuit board, a plurality of sensing elements, a light guiding plate, a plurality of first spacing blocks, and a plurality of second spacing blocks. The sensing elements are disposed on the circuit board. Each of the first spacing blocks and each of the second spacing blocks are respectively disposed on a bottom surface and a top surface of the light guiding plate, and are all located in a nil-light spot area of the light guiding plate. A spacing distance between two adjacent first spacing blocks is a third length. A spacing distance between two adjacent second spacing blocks is a fifth length. A position of any one of the second spacing blocks corresponds to a position between two of the first spacing blocks.