Transparent Display Touch Electrode Layout for Capacitance Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in achieving accurate touch sensing due to variations in capacitance between touch lines, which affect the reliability and precision of touch-based inputs.
Innovation Solution
Incorporating a compensation electrode connected to touch lines within the pixel structure to minimize capacitance differences, utilizing a transparent conductive material that extends from the emissive area to the transmissive area to compensate for capacitance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch lines are disposed at different positions in the pixel structure, then the touch sensing coverage is improved, but capacitance variations between touch lines cause decreased touch sensing accuracy
Solution Approach 1:
The patent introduces compensation electrodes at specific locations within the pixel structure to provide localized capacitance compensation. Each compensation electrode is positioned to compensate for capacitance variations of specific touch lines, creating non-uniform electrical properties where needed while maintaining overall structural uniformity
Solution Approach 2:
The patent modifies the electrical parameters of touch lines by introducing compensation electrodes that alter the capacitance values. By changing the capacitance parameter through additional electrostatic coupling paths, the patent equalizes the total capacitance across different touch lines positioned at various locations within the pixel
2Manufacturing precision
If multiple touch lines are integrated within the pixel structure, then the touch sensing resolution is improved, but the capacitance difference between touch lines increases
Solution Approach 1:
The patent divides the capacitance compensation function into separate compensation electrodes associated with different touch lines. Each compensation electrode segment addresses the capacitance characteristics of its corresponding touch line, allowing independent optimization and equalization of capacitance values across multiple touch lines
Solution Approach 2:
The compensation electrodes serve as intermediary elements that mediate between the touch lines and the source/drain electrodes. These intermediary structures provide additional electrostatic coupling paths that balance the capacitance values, acting as a buffer that equalizes electrical characteristics across different touch line positions
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 design enhances touch sensing accuracy by reducing capacitance disparities, thereby improving the reliability and precision of touch inputs in transparent display devices with an in-cell touch structure.
Implementation Method 1
Existing display devices face challenges in achieving accurate touch sensing due to variations in capacitance between touch lines
Implementation Method 2
Incorporating a compensation electrode connected to touch lines within the pixel structure to minimize capacitance differences
Data Source
AI summary
The display device includes a substrate in which a plurality of pixels each including an emissive area and a transmissive area is disposed. The device includes a plurality of touch lines and a plurality of data lines in the emissive area. The device includes a compensation electrode coupled to at least one of the plurality of touch lines. The device includes a planarization layer on the plurality of touch lines and the plurality of data lines and including an opening corresponding to the transmissive area. The device includes a light emitting diode on the planarization layer in the emissive area and a touch electrode disposed within the opening in the transmissive area. The plurality of touch lines includes a first touch line and a second touch line closer to the plurality of data lines than the first touch line. The compensation electrode is coupled to the first touch line.