Photosensitive Touch Panel for In-Air Detection
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Solution Overview
Problem
Large-sized touch display devices lack an effective in-the-air touch function, requiring users to physically approach the screen for interaction, which limits full-screen touch capability and increases manufacturing costs with the need for additional gesture recognition devices to support multiple users.
Innovation Solution
A touch panel comprising a first electrode layer, a photosensitive layer, and a second electrode layer, where the photosensitive layer generates a dielectric constant change under light irradiation, allowing for capacitive sensing to determine touch positions without physical contact, enabling both in-the-air and contact-type touch operations without additional gesture recognition devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional contact-based touch operation is used, then the touch display device can achieve basic touch functionality, but large-sized devices require users to physically approach the screen, limiting full-screen touch capability and requiring additional gesture recognition devices for multi-user support
Solution Approach 1:
The patent combines the photosensitive layer with the existing capacitor structure of the touch panel, merging the light detection function into the existing touch sensing architecture. This integration allows the touch panel to detect both contact touch and in-the-air touch without requiring separate gesture recognition devices, thereby reducing system complexity while achieving multi-mode touch capability.
Solution Approach 2:
The touch panel is designed to perform multiple functions: it can detect both traditional contact touch operations and in-the-air touch operations using the same hardware structure. The photosensitive layer enables the panel to respond to different types of input (light照射 and physical contact) through the same capacitor structure, achieving universal touch functionality without additional specialized devices.
2Adaptability or versatility
If additional gesture recognition devices are added to support in-the-air touch and multiple users, then multi-point touch capability is achieved, but manufacturing costs increase
Solution Approach 1:
The patent merges the gesture recognition function with the existing touch panel structure by incorporating a photosensitive layer into the capacitor structure. This combination eliminates the need for separate gesture recognition devices, thereby reducing manufacturing costs while achieving multi-point touch capability for multiple users.
Solution Approach 2:
The touch panel is designed to perform multiple functions: it can detect both traditional contact touch operations and in-the-air touch operations using the same hardware structure. The photosensitive layer enables the panel to respond to different types of input (light irradiation and physical contact) through the same capacitor structure, achieving universal touch functionality without additional specialized devices.
3Ease of operation
If the photosensitive layer is made conductive under light irradiation, then in-the-air touch detection is enabled, but the insulation between electrode layers may be compromised
Solution Approach 1:
The photosensitive layer dynamically changes its electrical properties based on light irradiation. In the dark state, it maintains high insulation resistance to prevent leakage between electrode layers. When exposed to light, it becomes conductive, allowing charge transfer for touch detection. This dynamic switching capability enables the layer to serve dual functions: maintaining insulation when needed and enabling detection when illuminated, thus resolving the contradiction between detection capability and insulation reliability.
Solution Approach 2:
The electrical conductivity parameter of the photosensitive layer is changed through light irradiation. The layer transitions from a high-resistance insulating state to a low-resistance conductive state based on the presence or absence of light. This parameter change allows the same material to serve different functional requirements (insulation vs. conduction) at different operational states, enabling in-the-air touch detection while maintaining structural reliability.
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
Enables multi-point touch capabilities for multiple users simultaneously, reducing manufacturing costs and improving user interaction by allowing in-the-air touch without additional hardware, while maintaining contact-type touch functionality.
Implementation Method 1
the photosensitive layer is configured to generate a dielectric constant change at a position under irradiation by light from a line light source
Data Source
AI summary
Provides is a touch panel. The touch panel includes: a first electrode layer, a photosensitive layer, and a second electrode layer that are laminated, wherein the photosensitive layer is insulated from the first electrode layer and the second electrode layer, and the first electrode layer, the photosensitive layer, and the second electrode layer are capable of forming a plurality of touch units arranged in an array. The photosensitive layer is configured to generate a dielectric constant change at a position under irradiation by light from a line light source.