In-Cell Touch Display Common Electrode Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In large-screen touch display devices, the increased number of touch sensors and touch lines leads to reduced transmittance and higher manufacturing costs, as well as degradation in display quality due to variations in common voltage.
Innovation Solution
The implementation of a touch display device with subpixels between adjacent touch sensors, where a common electrode is provided to receive and feedback common voltage, reducing the number of touch lines and touch sensors, and integrating feedback mechanisms to stabilize common voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch sensors and touch lines is increased to achieve higher resolution and coverage in large-screen touch display devices, then the touch sensing capability is improved, but the transmittance is reduced and manufacturing cost increases
Solution Approach 1:
The patent combines the common electrode used for display purposes with the touch sensor electrode structure. The common electrode serves dual functions: as a display electrode for liquid crystal control and as a touch sensing electrode. This merging eliminates the need for separate touch sensor electrodes, thereby reducing the number of touch lines required while maintaining touch sensing capability, which in turn improves transmittance without sacrificing touch functionality
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously: it acts as a display electrode for image rendering and as a touch sensor electrode for detecting touch input. This multi-functionality allows the system to maintain high touch sensing capability while reducing the number of dedicated touch lines, thereby improving overall transmittance
2Measurement precision
If the number of touch sensors and touch lines is increased to achieve higher resolution and coverage in large-screen touch display devices, then the touch sensing capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges the common electrode with the touch sensor structure, allowing one electrode to serve both display and touch sensing functions. This reduces the total number of electrodes and corresponding connection lines required, thereby simplifying the manufacturing process and reducing costs while maintaining high-resolution touch sensing capability
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously: display electrode and touch sensor electrode. This multi-functionality reduces the total component count and simplifies the manufacturing process, lowering production costs while maintaining high touch sensing resolution
3Device complexity
If the common voltage is supplied to all touch sensors without feedback mechanism, then the manufacturing complexity is reduced, but the display quality degrades due to common voltage variations
Solution Approach 1:
The patent introduces a feedback mechanism where the common electrode is connected to a feedback line that returns to the common voltage generation circuit. This feedback allows the system to detect and compensate for variations in common voltage, thereby maintaining display quality while managing the complexity through intelligent control rather than purely hardware-based solutions
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 reduces the number of touch lines and sensors, enhancing transmittance and display quality while lowering manufacturing costs by optimizing the number of input/output channels in the source/touch driving ICs and preventing common voltage variations.
Implementation Method 1
the capacitance type provides convenience in a manufacturing process and is good in touch sensitivity
Data Source
AI summary
Disclosed is an in-cell touch type touch display device in which the number of touch lines is reduced to increase a transmittance, and the number of touch integrated circuits (ICs) is reduced to lower the manufacturing cost. The touch display device includes a touch display panel and a driving circuit unit. A plurality of touch sensors may be disposed in the touch display panel, and a plurality of subpixels including a common electrode may be provided between the plurality of touch sensors. The subpixels may be provided between the plurality of touch sensors which are adjacent to each other in a horizontal direction and a vertical direction. The driving circuit unit may include a touch driver, a touch sensing unit, and a power supply. The touch driver may supply a touch driving signal to the plurality of touch sensors.