Light Source Module Circuit Coverage for Touch Reliability
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Solution Overview
Problem
High-end touch drawing boards require a light source module that does not interfere with electromagnetic induction between the touch sensing layer and electronic styluses, as edge-type backlight modules are insufficient for high dynamic range imaging.
Innovation Solution
A light source module with a circuit layer coverage rate of less than 50% on its light emitting surface, minimizing the distribution area of circuits and avoiding unnecessary metal layers to prevent interference with electromagnetic induction, featuring a substrate with circuit layers and light emitting elements arranged to reduce physical obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional backlight module with larger circuit coverage is used, then manufacturing cost and structural simplicity are improved, but electromagnetic induction between the touch sensing layer and electronic stylus is interfered with
Solution Approach 1:
The patent applies local quality by creating different coverage rates for different regions of the circuit layer. Specifically, the first circuit layer has a first coverage rate in a first region and a second coverage rate in a second region, where the coverage rates differ. This allows the circuit to provide sufficient electrical connection in areas where it matters while minimizing interference with electromagnetic induction in the touch sensing region, thus resolving the contradiction between reliability and device complexity.
2Illumination intensity
If an edge-type backlight module is used to avoid interference, then electromagnetic induction is protected, but high dynamic range imaging demands cannot be satisfied
Solution Approach 1:
The patent segments the circuit layer into multiple layers (first circuit layer and second circuit layer) with different coverage rates in different regions. This segmentation allows the light source module to provide sufficient illumination intensity through the light emitting element while the segmented circuit structure minimizes interference with electromagnetic induction by reducing the overall coverage and distributing the circuit elements strategically.
3Ease of manufacture
If the circuit coverage rate is increased to improve electrical connection, then manufacturing is simplified, but interference with touch sensing increases
Solution Approach 1:
The patent applies parameter changes by optimizing the coverage rate parameters of the circuit layers. The first circuit layer has a first coverage rate and the second circuit layer has a second coverage rate, with specific relationships between these parameters (e.g., the sum of coverage rates or their distribution patterns). By carefully controlling these coverage rate parameters, the patent achieves sufficient electrical connection for manufacturing while minimizing the harmful effect of interference with electromagnetic induction in the touch sensing layer.
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 design ensures that the circuit layers between the electronic stylus and touch sensing layer do not interfere with electromagnetic induction, allowing for reliable touch input functions even in high-end applications with high dynamic range imaging demands.
Implementation Method 1
at least one light emitting element, wherein the circuit layer is disposed between the light emitting element and the touch sensing layer
Implementation Method 2
The circuit layer includes at least one circuit (trace)
Data Source
AI summary
A light source module having a light emitting surface is provided. The light source module includes at least one substrate, at least one circuit layer, and at least one light emitting element. The at least one circuit layer is disposed on at least one surface of the at least one substrate, and the at least one circuit layer includes at least one circuit. An orthogonal projection of the at least one circuit onto the light emitting surface forms a circuit region, and a coverage rate of the circuit region on the light emitting surface is less than 50%. The at least one light emitting element is disposed on the at least one surface of the at least one substrate and is connected to the at least one circuit layer. In addition, a touch device having the light source module is also provided.