OLED Substrate Touch Integration via Mutual Capacitance
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Solution Overview
Problem
Current display technologies lack integration of touch functionality with OLED display technology, preventing the simultaneous implementation of touch capabilities and OLED display features in a single device.
Innovation Solution
An OLED display substrate is designed with a base substrate, a first electrode layer containing driving and sensing electrodes that form mutual capacitance, and a light-emitting layer between the electrode layers, along with a driving circuit for resetting and loading signals to enable touch detection and picture display in separate stages, allowing for simultaneous touch operation and picture display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch function and OLED display function are integrated in the same device, then the device functionality is improved, but the interference between touch detection and display causes deterioration in operation reliability
Solution Approach 1:
The patent divides the operation cycle into distinct time segments: a first time period dedicated to touch detection and a second time period dedicated to display operation. During the first time period, the display is turned off to detect touch input, and during the second time period, normal display operation resumes. This temporal segmentation eliminates interference between touch detection and display functions, resolving the reliability issue while maintaining integrated functionality.
2Productivity
If touch detection and display operation are performed simultaneously, then operation efficiency is improved, but mutual interference between the two functions causes deterioration in detection precision
Solution Approach 1:
The patent implements periodic alternation between touch detection mode and display operation mode. The control circuit periodically switches between these two states, with each period consisting of a touch detection phase followed by a display operation phase. This periodic action ensures that touch detection is performed under optimal conditions (without display interference) while maintaining continuous operational cycles, thus preserving both detection precision and operational efficiency.
3Measurement precision
If time-sharing operation is used to separate touch detection and display, then detection precision is improved, but time loss due to sequential operation increases
Solution Approach 1:
The patent incorporates a capacitance reset step before each touch detection phase, which is a preliminary action that prepares the sensing system for accurate detection. By resetting the capacitance values to baseline levels before touch detection begins, the system ensures that subsequent measurements start from a known state, improving detection precision. This preliminary reset action is performed quickly and automatically as part of the periodic cycle, minimizing its impact on overall operation time.
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 solution effectively integrates touch technology with OLED display technology, reducing the impact of touch operations on picture display by separating reset and display stages, and eliminates the need for time-sharing operations, achieving efficient and effective touch functionality.
Implementation Method 1
mutual capacitance is formed between the driving electrodes and the sensing electrodes
Implementation Method 2
the hole and the electron are transported in the organic layer and encounter to form an exciton; under action of an electric field, the exciton causes radiation transition in an organic light-emitting molecule, resulting in a luminescence phenomenon
Data Source
AI summary
An OLED display substrate, a driving method thereof and an OLED display device. The OLED display substrate includes: a base substrate and a first electrode layer, a light-emitting layer and a second electrode layer disposed on the base substrate, the light-emitting layer being disposed between the first electrode layer and the second electrode layer, the first electrode layer including a driving electrode and a sensing electrode corresponding to the driving electrode, and a mutual capacitance being formed between the driving electrode and the sensing electrode corresponding to the driving electrode. A mutual capacitance is formed between the driving electrode and the sensing electrode corresponding to the driving electrode, so as to integrate a touch technology and an OLED display technology.