Capacitive Touch Display Panel Bridge Line Reflection Control
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Solution Overview
Problem
Conventional capacitive touch display panels face issues with light reflection due to metal bridge lines, which affect display performance and increase manufacturing costs and thickness.
Innovation Solution
Incorporating a patterned low reflective layer on the side of non-transparent bridge lines opposite to the display panel, overlapping them in a vertical projective direction to prevent reflection, while maintaining identical conductive materials for transparent electrodes and bridge lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal materials are used for bridge lines to improve signal transmitting performance, then electrical resistance is reduced, but light reflection is generated affecting display performance
Solution Approach 1:
An anti-reflection coating layer is introduced as an intermediary between the metal bridge line and the display panel. This coating layer has a refractive index between air and the metal material, reducing light reflection through optical impedance matching while allowing the metal bridge line to maintain its electrical conductivity function.
Solution Approach 2:
The anti-reflection coating layer modifies the optical properties of the bridge line region by changing the refractive index gradient, thereby reducing reflection across visible wavelengths. This allows the bridge line to maintain its metal composition for electrical performance while the coating suppresses the harmful visual reflection effect.
2Object-generated harmful factors
If an anti-reflection sheet is attached on the touch display panel to reduce reflection, then light reflection is reduced, but manufacturing cost increases and total thickness increases
Solution Approach 1:
The anti-reflection function is merged with the existing bridge line structure by forming an anti-reflection coating directly on or near the bridge line region. This integrates the reflection reduction function into the existing manufacturing process rather than adding a separate anti-reflection sheet, thereby reducing both cost and thickness while maintaining reflection suppression.
Solution Approach 2:
Instead of adding a separate anti-reflection sheet in the Z-direction (thickness dimension), the solution applies an anti-reflection coating that utilizes the existing bridge line structure as a substrate. This approach reduces the need for additional thickness while achieving the same optical function through a more integrated dimensional approach.
3Reliability
If transparent electrodes and bridge lines use different materials to optimize signal transmission, then electrical performance is improved, but display performance is affected due to reflection from metal bridge lines
Solution Approach 1:
The anti-reflection coating acts as an intermediary that allows the metal bridge line to maintain its superior electrical conductivity while preventing it from degrading the display performance through reflection. This mediator enables the coexistence of different materials (transparent electrodes and metal bridge lines) without compromising either electrical performance or display quality.
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 solution effectively reduces light reflection without impacting display performance or manufacturing complexity, maintaining cost-effectiveness and thickness levels.
Implementation Method 1
the display performance of the touch display panel may be affected because reflection light may be generated from the metal materials of the bridge line
Data Source
AI summary
A capacitive touch display panel includes a display panel, an outer substrate, and a capacitive touch device. The capacitive touch device is disposed between the outer substrate and the display panel. The capacitive touch device includes a plurality of first transparent electrodes, at least one transparent bridge line, a plurality of second transparent electrodes, at least one non-transparent bridge line, and at least one patterned low reflective layer. The patterned low reflective layer is disposed on an opposite side of the non-transparent bridge line with respect to the display panel. The patterned low reflective layer and the non-transparent bridge line are overlapped to each other in a vertical projective direction.