Touch Display Device Using Pixel Electrodes for Touch Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch display devices face challenges in sensing touch inputs without additional touch panels or electrodes, leading to increased size and complex manufacturing processes, especially with external touch panels and embedded touch panels requiring additional electrode formation.
Innovation Solution
A touch display device utilizing pixel electrodes as touch electrodes, where a sensing circuit applies a variable reference signal to sense touch inputs, preventing parasitic capacitance and improving sensitivity by controlling the gate signal output to increase touch electrode size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external touch panel is used, then touch sensing function is achieved, but device size is increased and additional manufacturing processes are required
Solution Approach 1:
The patent merges the touch sensing function with the display panel by using the same pixel electrodes for both display and touch sensing purposes. This integration eliminates the need for a separate external touch panel, thereby reducing device size while maintaining touch sensing functionality.
Solution Approach 2:
The pixel electrodes in the display panel are designed to serve dual functions: displaying images and sensing touch inputs. By making the display electrodes multi-functional, the patent eliminates the need for additional touch panel components, reducing overall device volume.
2Reliability
If an embedded touch panel is used, then touch sensing function is achieved, but manufacturing process complexity is increased due to additional electrode formation
Solution Approach 1:
The patent makes the display panel electrodes serve dual purposes as both display elements and touch sensing elements. This eliminates the need for separate touch electrode formation processes, thereby simplifying the manufacturing process while maintaining embedded touch functionality.
Solution Approach 2:
The patent combines the touch sensing electrode structure with the display electrode structure, so that the same physical electrodes perform both display and touch sensing functions. This merging eliminates additional manufacturing steps required for separate touch electrode formation.
3Ease of manufacture
If pixel electrodes are used as touch electrodes without driving nearby electrodes, then manufacturing is simplified, but parasitic capacitance forms and touch sensitivity decreases
Solution Approach 1:
The patent applies preliminary action by driving nearby electrodes in synchronization with the touch sensing electrode before and during the touch sensing operation. This pre-coordination of electrode driving prevents the formation of parasitic capacitance that would otherwise degrade touch sensitivity, while maintaining the manufacturing simplicity of using pixel electrodes.
Solution Approach 2:
The patent applies preliminary anti-action by driving adjacent electrodes with complementary signals that counteract the formation of parasitic capacitance. This anti-phase driving prevents unwanted capacitance buildup that would reduce touch sensing accuracy, while keeping the electrode structure simple.
4Reliability
If the touch electrode size is increased by controlling gate signal output, then touch sensitivity is improved, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the gate signal voltage levels and driving waveforms based on the touch sensing requirements. This dynamic control allows the system to increase touch electrode effectiveness for improved sensitivity while optimizing energy consumption by using higher voltages only when and where needed for touch detection.
Solution Approach 2:
The patent changes electrical parameters such as gate signal voltage amplitude, frequency, and waveform characteristics to optimize touch sensitivity. By adjusting these parameters, the system achieves improved touch detection capability while managing energy consumption through efficient signal design.
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 approach simplifies manufacturing, reduces device size, and enhances touch sensitivity by using existing display electrodes for touch sensing, eliminating the need for additional touch panels and electrodes.
Implementation Method 1
A touch panel including a plurality of touch electrodes, which correspond to touch sensors
Implementation Method 2
the size of a touch electrode is increased by controlling an output of a gate signal
Data Source
AI summary
The present disclosure relates to a touch display device and a driving method of the same, and more particularly, to a touch display device, in which a touch is sensed by only utilizing electrodes and a line structure for display so that there is no need to provide a touch panel additionally or form additional touch electrodes in a display panel, thereby reducing the size (thickness) of the touch display device and simplifying a manufacturing process of the touch display device, and a driving method of the same.