Touch Display Panel Electrode Overlap for Expanded Sensing Area
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Solution Overview
Problem
In-cell touch type display devices face reduced touch performance due to decreased touch electrode area caused by the distance between touch electrodes and adjacent metal electrodes, leading to issues such as reduced transmission efficiency and increased production costs.
Innovation Solution
A structure where a portion of the touch electrode overlaps a portion of the anode electrode, with the touch electrode located over or under the anode electrode, and a touch electrode and touch line interconnected by a touch jumping line in the same layer as the anode electrode, along with spacers opposing each other to increase touch capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch panel is combined with a display device, then touch functionality is provided, but the display device becomes thick and light transmission efficiency is reduced
Solution Approach 1:
The patent merges the touch electrode and display electrode into a single integrated electrode structure within the display panel. The touch electrode is formed in the same layer as the anode electrode of the display device, eliminating the need for a separate touch panel layer and thereby reducing overall device thickness while maintaining both display and touch functionalities.
Solution Approach 2:
The integrated electrode serves dual functions: it acts as both the display electrode for light emission control and the touch electrode for sensing touch input. This multi-functional design eliminates the need for separate dedicated touch panel layers, reducing device thickness while providing complete touch functionality.
2Device complexity
If touch electrodes are positioned close to adjacent metal electrodes, then device complexity is reduced, but touch electrode area decreases and touch performance is reduced
Solution Approach 1:
The patent extends the touch electrode area by utilizing the vertical stacking dimension. The touch electrode overlaps with adjacent metal electrodes in the vertical direction (different layers) while maintaining adequate horizontal spacing. This allows the touch electrode to achieve sufficient area for good touch performance without requiring increased horizontal spacing that would complicate the electrode layout.
Solution Approach 2:
The touch electrode is positioned within the vertical stack of the display structure, overlapping with metal electrodes in different layers. This nested arrangement allows multiple electrode functions to coexist in a compact vertical configuration, maintaining touch electrode area while avoiding horizontal spacing conflicts.
3Ease of manufacture
If touch electrodes are positioned close to adjacent metal electrodes, then manufacturing is simplified, but transmission efficiency is reduced
Solution Approach 1:
The patent moves the electrode arrangement to the vertical dimension by overlapping the touch electrode with metal electrodes in different layers. This allows the touch electrode to be positioned close to metal electrodes for simplified manufacturing (formed in the same process layer as the anode) while maintaining light transmission efficiency by avoiding horizontal overlap that would block light paths.
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 configuration enhances the touch electrode area, simplifies the manufacturing process, and improves touch performance by increasing touch capacitance.
Implementation Method 1
a touch electrode including an overlap area overlapping a portion of the anode electrode in a non-light emitting area on the touch buffer layer
Data Source
AI summary
The present disclosure provide a display device and a display panel, the display panel including: a transistor disposed over a substrate; a first planarization layer and a second planarization layer disposed over the transistor; an anode electrode disposed in a light emitting area on the second planarization layer and electrically connected to the transistor through an anode contact hole; a touch buffer layer disposed to cover the anode electrode; a touch electrode including an overlap area overlapping a portion of the anode electrode in a non-light emitting area on the touch buffer layer; a touch line disposed under the touch electrode and electrically connected to the touch electrode through a touch contact hole; a bank covering the touch electrode and including an opening in which the light emitting area is placed; and an emission layer and a cathode electrode sequentially disposed on the anode electrode.