RF Touch Recognition on Display Lines Without Brightness Loss
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Solution Overview
Problem
Touch screens in displays reduce light emission and increase power consumption, necessitating brighter displays and higher power consumption, which shortens battery life.
Innovation Solution
Implementing radiofrequency (RF) transmitters and receivers on display lines to detect user interactions and gestures using RF signals, allowing for touch and gesture recognition without reducing light emission or increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a laminate touch sensing layer or in-cell pixel sensing is implemented, then touch sensing capability is improved, but light emission is reduced and power consumption increases
Solution Approach 1:
The patent replaces the mechanical/optical touch sensing systems (laminate layers or in-cell pixel sensing) with an RF-based electromagnetic field detection system. The display lines are configured to transmit and receive RF signals, and touch events are detected by measuring changes in the RF signal characteristics (such as impedance changes or signal scattering) caused by the conductive properties of the human body. This substitution eliminates the need for additional touch sensing layers that block light, thereby resolving the contradiction between touch sensing capability and light emission.
2Ease of operation
If a laminate touch sensing layer or in-cell pixel sensing is implemented, then touch sensing capability is improved, but display brightness is reduced
Solution Approach 1:
The patent replaces the mechanical/optical touch sensing systems with an RF-based electromagnetic field detection system. By using the display lines themselves as RF transmitters and receivers, the system detects touch events through electromagnetic field interactions with the human body without requiring any additional physical layers. This eliminates the light-blocking effect of traditional touch layers, thereby maintaining display brightness while providing accurate touch sensing capability.
3Illumination intensity
If brighter display is implemented to compensate for light loss, then display visibility is improved, but power consumption increases
Solution Approach 1:
The patent extracts the touch sensing function from the optical display system and implements it through a separate RF signal detection mechanism using the existing display lines. This separation allows the display to operate at its normal brightness level without the need for compensation, as the RF-based touch sensing does not interfere with light emission. Consequently, the display can maintain optimal visibility while avoiding the additional power consumption that would result from increasing brightness to compensate for light blockage.
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 accurate detection of touch and gesture inputs with minimal impact on display brightness and power consumption, enhancing user interaction efficiency.
Implementation Method 1
An RF signal transmitted on one display line may be scattered to other display lines due to the presence of a nearby object
Data Source
AI summary
Techniques for radiofrequency (RF) touch and gesture recognition are disclosed. In the illustrative embodiment, RF transmitters and receivers are connected to data lines and gate lines of a display. RF signals sent on one data or gate line may be scattered to a different data or gate line based on the presence of a nearby object, such as a finger. The amount of scattering on different data or gate lines can be used to determine a location of one or more objects.