Integrated Cathode Touch Metal for Thinner Displays
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Solution Overview
Problem
Existing touch display devices face challenges in achieving a thinner structure and reducing power consumption, particularly when integrating a touch panel with the display panel.
Innovation Solution
The touch display device incorporates a substrate with a planarization film, an anode electrode, touch metal, and a bank with cavities, along with an organic light emitting layer and a cathode electrode that includes separated cathode electrodes connected to touch metals, enabling touch sensing without a separate touch electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate touch panel is disposed on the display panel, then touch sensing function is achieved, but device thickness is increased
Solution Approach 1:
The patent merges the touch electrode layer with the cathode electrode layer of the OLED, creating a single integrated structure that performs both touch sensing and light emission functions. The cathode electrode is configured to serve dual purposes: emitting light as part of the OLED structure and detecting touch input through capacitance changes, thereby eliminating the need for a separate touch panel layer and reducing overall device thickness.
Solution Approach 2:
The cathode electrode is designed with multi-functionality, serving both as the light-emitting component of the OLED and as the touch sensing electrode. This universal structure allows the same component to perform multiple functions (light emission and touch detection), eliminating redundant layers and reducing device thickness while maintaining both display and touch capabilities.
2Ease of operation
If a separate touch panel is disposed on the display panel, then touch sensing function is achieved, but power consumption is increased
Solution Approach 1:
The patent combines the touch electrode and cathode electrode into a single structure, eliminating the need for separate touch panel driving circuits and reducing redundant power consumption. The integrated structure allows shared use of electrode materials and driving signals, reducing overall energy consumption while maintaining touch sensing functionality.
Solution Approach 2:
The multi-functional cathode electrode reduces power consumption by eliminating redundant electrical connections and driving circuits associated with separate touch panels. The same electrode structure serves both light emission and touch sensing, reducing the total energy required to operate both display and touch functions.
3Ease of operation
If a separate touch panel is disposed on the display panel, then touch sensing function is achieved, but manufacturing process complexity is increased
Solution Approach 1:
The patent merges the touch electrode formation process with the OLED cathode electrode formation process, allowing both structures to be created in the same manufacturing steps. This integration eliminates separate alignment and deposition processes for touch panels, simplifying manufacturing while maintaining precise electrode positioning for touch sensing.
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 allows for a thinner touch display device structure and reduces power consumption by eliminating the need for a separate touch electrode layer and simplifying the manufacturing process.
Implementation Method 1
an organic light emitting layer disposed in the first cavity and disposed over the anode electrode
Implementation Method 2
capacitive sensing scheme enabling the presence or absence of a touch, touch coordinates, or the like to be detected based on a change in capacitance between touch electrodes
Data Source
AI summary
A touch display device comprises a substrate; planarization film disposed over the substrate; an anode electrode and a touch metal disposed on the planarization film; a bank disposed over the planarization film on which the anode electrode and the touch metal are disposed, and the bank including a first cavity exposing the anode electrode and a second cavity exposing the touch metal; an organic light emitting layer disposed in the first cavity and disposed over the anode electrode; and a cathode electrode disposed over the organic light emitting layer and the bank, wherein the cathode electrode includes a first cathode electrode and a second cathode electrode, which are separated from each other, and a part of the first cathode electrode is disposed in the second cavity and connected to the touch metal in the second cavity.