In-Cell Touch Electrode Phasing for Thinner Display Panels
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Solution Overview
Problem
Existing display devices with touch sensing units require separate sensor layers or digitizer layers, which increase thickness and cost.
Innovation Solution
A display device with a touch sensing unit that uses a touch driver to supply touch driving signals with opposite phases to touch electrodes, generating a magnetic field for electromagnetic resonance and differentially amplifying touch sensing signals to detect touch inputs without additional layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sensor layers or digitizer layers are added to the display device, then touch sensing capability is improved, but device thickness and manufacturing cost increase
Solution Approach 1:
The patent merges the touch sensing function with the existing display electrode structure by using the display electrode as both a display element and a touch sensing element. The touch driver supplies opposite-phase driving signals to adjacent display electrodes, enabling electromagnetic resonance-based touch detection without adding separate sensor layers, thus resolving the contradiction between touch sensing capability and device thickness
Solution Approach 2:
The display electrodes are designed to serve dual functions: displaying images and sensing touch inputs. By enabling the existing electrode structure to perform both display and touch sensing functions simultaneously, the patent eliminates the need for additional dedicated sensor layers, thereby maintaining thin device profile while achieving reliable touch detection
2Reliability
If separate sensor layers or digitizer layers are added to the display device, then touch sensing capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines touch sensing functionality with the existing display electrode structure, eliminating the need for separate sensor layers and digitizer layers. This merging approach reduces the number of manufacturing steps and material layers required, thereby lowering manufacturing cost while maintaining effective touch sensing capability
Solution Approach 2:
By designing the display electrodes to perform both display and touch sensing functions, the patent eliminates the need for additional dedicated sensor components. This multi-functional design reduces bill of materials cost and simplifies the manufacturing process, resolving the contradiction between touch sensing capability and manufacturing cost
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
Reduces thickness and cost by eliminating the need for separate sensor layers while maintaining effective touch input detection.
Implementation Method 1
A display device with a touch sensing unit that uses a touch driver to supply touch driving signals with opposite phases to touch electrodes, generating a magnetic field for electromagnetic resonance
Data Source
AI summary
A display device includes a display unit having pixels, a touch sensing unit including touch electrodes disposed on the display unit, and a touch driver configured to supply a touch driving signal to the plurality of touch electrodes and receive a touch sensing signal from the touch electrodes. The touch driver supplies a first touch driving signal having a first phase to one or more first touch electrodes, and supplies a second touch driving signal having a second phase opposite to the first phase to one or more second touch electrodes, at least a part of which is disposed across a specific point from the first touch electrodes. The touch driver receives a first touch sensing signal having the first phase from at least one of the first touch electrodes, and receives a second touch sensing signal having the second phase from at least one of the second touch electrodes.