Touch Module Wiring Density for Camera Under Panel Light Transmittance
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Solution Overview
Problem
In camera under panel (CUP) regions of touch display panels, signal attenuation occurs, affecting the normal operation of both display and touch functions, particularly due to light transmittance issues.
Innovation Solution
A touch module is designed with a specific arrangement of insulating layers, touch sensing wirings, and metal layers, including criss-crossed metal lines and connection lines, to reduce signal attenuation by optimizing capacitance ratios and wiring densities between the display and light-transmissive regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch sensing wirings are densely arranged in the CUP region to ensure touch sensitivity, then touch detection capability is improved, but light transmittance deteriorates due to increased wiring density
Solution Approach 1:
The patent applies different wiring densities in different regions: the CUP region uses lower wiring density to maintain light transmittance, while the display region uses higher wiring density for adequate touch sensitivity. The insulating layer structure varies by region, with thicker portions in the CUP region and thinner portions in the display region, optimizing each area's specific requirements.
Solution Approach 2:
The patent introduces a vertical dimension by creating an insulating layer with varying thickness (first insulating layer and second insulating layer with different thicknesses) to resolve the horizontal trade-off between wiring density and light transmittance. This multi-layer insulating structure allows capacitance sensing in the CUP region without increasing horizontal wiring density.
2Reliability
If wiring density is increased to reduce signal attenuation, then touch signal quality is improved, but light transmittance in the CUP region deteriorates
Solution Approach 1:
The patent implements region-specific insulating layer structures where the CUP region has a thicker second insulating layer that provides adequate capacitance for touch sensing without requiring dense wirings, while the display region has a thinner structure optimized for display performance. This local differentiation maintains signal quality without compromising light transmittance in the CUP region.
3Measurement precision
If the insulating layer thickness is increased to improve touch sensing capacitance, then touch sensitivity is improved, but light transmittance deteriorates due to additional material layers
Solution Approach 1:
The patent divides the insulating layer into multiple segments: a first insulating layer and a second insulating layer with different thicknesses. The second insulating layer is thicker in the CUP region to provide adequate capacitance, while the first insulating layer provides base insulation. This segmentation allows localized capacitance enhancement without uniformly increasing light path obstruction.
Solution Approach 2:
The insulating layer structure is optimized locally for the CUP region with a thicker second insulating layer only where needed for capacitance, while maintaining thinner overall structure in the display region. This localized thickness variation improves touch sensing in the CUP region without proportionally increasing light transmittance loss across the entire panel.
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 reduces signal attenuation in the CUP region, ensuring normal touch and display functions without compromising light transmittance, thereby enhancing the overall performance of touch display panels.
Implementation Method 1
a second region corresponding to the light-transmissive region, wherein the second region includes a plurality of second sub-regions arranged in an array and a light-transmissive sub-region disposed between any adjacent four second sub-regions; and a plurality of first touch sensing wirings, wherein each of the first touch sensing wirings is formed in a corresponding one of the second sub-regions
Data Source
AI summary
The present invention provides a touch module placed on a display panel. The display panel includes a display region and a light-transmissive region. The touch module includes: a first insulating layer and multiple first touch sensing wirings. The first insulating layer includes a first region facing the display region and a second region facing the light-transmissive region. The second region includes multiple second sub-regions arranged in an array and a light-transmissive sub-region arranged between any adjacent four second sub-regions. Each of the first touch sensing wirings is formed in a corresponding one of the second sub-regions. The first touch sensing wirings of any two adjacent second sub-regions are electrically connected through a first connection line.