Touch Display Conductive Layer Heating and Shielding
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Solution Overview
Problem
Touch display devices fail to operate normally in low temperature environments and are susceptible to external electromagnetic interference, leading to abnormal displays and reduced touch precision or failure.
Innovation Solution
A touch display device with a conductive layer that functions as both a heating layer at low temperatures and a shielding layer at higher temperatures, using a control device to manage the conductive layer's voltage application and grounding to maintain proper operation and protect against electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a touch display device is used in a low temperature environment, then the device can operate in cold conditions, but the liquid crystal may change into a solid state and the touch function may fail
Solution Approach 1:
The conductive layer is pre-configured between the first and second substrates to provide heating capability before low temperature conditions occur. When temperature drops below the first threshold, the control element activates the conductive layer to generate heat, preventing the liquid crystal from solidifying and maintaining touch functionality throughout the cold environment.
Solution Approach 2:
The conductive layer's electrical properties are utilized to change its function based on temperature conditions. By applying voltage to the conductive layer in low temperature environments, its electrical energy is converted to thermal energy, raising the temperature above the liquid crystal's freezing point and ensuring continuous operation.
2Adaptability or versatility
If the touch display device is exposed to external electromagnetic interference, then the device can be used in electromagnetic environments, but the touch function layer may be affected and touch precision may be reduced or fail
Solution Approach 1:
The conductive layer, which generates electromagnetic fields when used for heating, is repurposed as an electromagnetic shielding layer. By grounding the conductive layer in electromagnetic interference environments, it creates a Faraday cage effect that blocks external electromagnetic fields from reaching the touch function layer, thereby protecting touch precision while utilizing the same structural element.
Solution Approach 2:
The conductive layer serves multiple functions: it acts as a heating element in low temperature environments and as an electromagnetic shielding layer in electromagnetic interference environments. This multi-functionality is achieved through the control element, which switches the conductive layer's configuration based on the type of environmental challenge faced.
3Reliability
If separate heating and shielding components are added to the touch display device, then both low temperature operation and electromagnetic shielding can be achieved, but the device complexity increases
Solution Approach 1:
The conductive layer is designed to perform both heating and electromagnetic shielding functions. By controlling the voltage applied to this single layer, the system achieves both low temperature operation support and electromagnetic interference protection without adding separate heating elements or shielding layers, thereby maintaining structural simplicity.
Solution Approach 2:
The heating function and electromagnetic shielding function are merged into a single conductive layer structure. This layer is positioned between the first and second substrates and can be electrically controlled to provide thermal energy when needed or to act as a Faraday cage when electromagnetic protection is required, eliminating the need for separate components.
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 conductive layer effectively heats the device at low temperatures and shields it from electromagnetic interference at higher temperatures, ensuring normal operation and touch functionality across varying environmental conditions.
Implementation Method 1
the conductive layer is used as a heating layer to heat the touch display device when an ambient temperature where the touch display device is located is lower than or equal to a first threshold and a temperature of the touch display device is lower than a second threshold
Implementation Method 2
the conductive layer is used as a shield layer to shield the touch function layer from electromagnetic interference when the ambient temperature is higher than the first threshold
Data Source
AI summary
A touch display device includes a first substrate and a second substrate disposed opposite to each other, wherein a touch functional layer and a conductive layer are insulated from each other and are disposed on the second substrate. The conductive layer is disposed between the touch function layer and the first substrate; and the conductive layer serves as a heating layer in a first state and serves as a shield layer in a second state.