OLED Touch Display Substrate Integrating Cathode as Touch Electrode
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Solution Overview
Problem
Existing OLED touch display devices have relatively low light transmittance and large thickness due to the separate manufacturing and assembly of OLED display and touch panels.
Innovation Solution
An OLED touch display substrate is designed with a cathode formed into sub-cathodes that serve as touch electrodes, integrated with touch signal lines, allowing for a single structure that combines display and touch functions without an add-on touch panel, utilizing a base substrate with an anode and functional layers for high light transmittance and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an OLED display panel and a touch panel are manufactured separately and combined together, then the device can provide touch functionality, but the light transmittance is reduced and the thickness increases
Solution Approach 1:
The patent merges the OLED display panel and touch panel into a single integrated substrate. The cathode of the OLED is designed to serve dual purposes: as the electron injection electrode for light emission and as the touch electrode for touch sensing. This eliminates the need for separate touch panel layers, thereby improving light transmittance and reducing overall thickness while maintaining full touch functionality.
Solution Approach 2:
The cathode electrode is designed with multi-functionality, serving both as the electron injection electrode for OLED light emission and as the touch electrode for capacitive touch sensing. This universal design allows a single component to fulfill multiple roles, eliminating redundant structures and improving optical performance.
2Adaptability or versatility
If an OLED display panel and a touch panel are manufactured separately and combined together, then the device can provide touch functionality, but the structure becomes more complex and thickness increases
Solution Approach 1:
The patent combines the display and touch functions into a single integrated substrate structure. The OLED cathode is formed as the touch electrode, eliminating the need for separate touch panel manufacturing steps and reducing structural complexity. The insulating layer and anode structure serve both display and touch sensing functions.
Solution Approach 2:
Multiple components in the integrated structure serve dual purposes: the cathode is both the OLED electron injection electrode and the touch sensing electrode; the insulating layer provides both OLED device isolation and touch electrode insulation; the anode serves both light emission and touch signal detection functions.
3Adaptability or versatility
If an OLED display panel and a touch panel are manufactured separately and combined together, then the device can provide touch functionality, but the overall thickness becomes larger
Solution Approach 1:
The patent merges the OLED display structure and touch panel structure into a single integrated substrate, eliminating the need for separate touch panel layers. This integration significantly reduces the overall thickness by removing redundant substrate layers, adhesive layers, and encapsulation structures that would be present in a stacked configuration.
Solution Approach 2:
The touch sensing functionality is nested within the OLED display structure itself. The touch electrodes are formed using the same cathode layer that serves the OLED function, and the touch sensing operations are integrated into the OLED driving waveform, creating a compact nested architecture.
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
The solution simplifies the structure, reduces thickness, and enhances light transmittance by integrating touch functionality into the OLED display substrate, eliminating the need for a separate touch panel and improving touch sensitivity and display performance.
Implementation Method 1
the functional layer arranged between the anode and the cathode... within the display time period, the functional layer is capable of emitting white light
Data Source
AI summary
An OLED touch display substrate, an OLED touch display panel, a display device and a control method thereof are provided. The OLED touch display substrate includes an anode, a cathode and a functional layer arranged on a base substrate. The cathode includes sub-cathodes, a time period for displaying one image frame of the OLED touch display substrate includes a display time period and a touch time period, and the sub-cathodes further serve as touch electrodes. The touch display substrate further includes touch signal lines electrically connected to the touch electrodes. Within the display time period, a common voltage signal is applied to each touch electrode via the respective touch signal line. Within the touch time period, a touch scanning signal is applied to each touch electrode via the respective touch signal line, and it is detected whether or not a self-capacitance of the touch electrode changes.