AMOLED Pixel Circuit Integrating Touch Sensing via Shared Data Lines
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Solution Overview
Problem
The integration of a Touch Screen Panel (TSP) in Cell circuit into an Active Matrix Organic Light Emitting Diode (AMOLED) pixel unit circuit is hindered by the lack of space for additional Thin-Film Transistors (TFTs) and signal lines, which are required to maintain the functionality of a touch screen in AMOLED displays.
Innovation Solution
The integration is achieved by incorporating a light emitting module, driving module, threshold compensation module, light emitting control module, touch sensing module, and sensing signal outputting module into the AMOLED pixel unit circuit, utilizing existing data lines and control signals, and redesigning the time sequences and voltage levels of working signals to accommodate the TSP in Cell circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TSP in Cell circuit is integrated into AMOLED pixel unit circuit using traditional design, then touch screen functionality is achieved, but pixel area is insufficient due to additional TFTs and signal lines required
Solution Approach 1:
The patent merges the TSP in Cell circuit with the AMOLED pixel unit circuit by sharing common data lines and control signals. The touch sensing module and light emitting module share the same data line for signal input, and the driving module serves dual purposes for both touch signal amplification and OLED driving, thereby eliminating the need for separate dedicated signal lines and reducing overall circuit area.
Solution Approach 2:
The driving module is designed with multi-functionality to serve both the touch sensing module and the light emitting module. It can amplify touch sensing signals and also drive the OLED pixel, reducing the need for separate dedicated circuits and minimizing the additional area required for integration.
2Adaptability or versatility
If additional TFTs and capacitors are added to maintain TSP functionality in AMOLED, then touch sensing capability is preserved, but device complexity increases
Solution Approach 1:
The patent combines the TSP in Cell circuit components with the AMOLED pixel unit circuit components. The touch sensing module, driving module, and light emitting module are integrated such that they share common data lines and control signals, reducing the total number of discrete components and simplifying the overall circuit architecture.
Solution Approach 2:
The driving module is designed to perform multiple functions: amplifying touch sensing signals and driving the OLED pixel. This multi-functionality reduces the need for separate dedicated circuits, thereby reducing device complexity while maintaining both touch sensing and display functionalities.
3Adaptability or versatility
If TSP in Cell circuit is integrated into AMOLED pixel unit circuit, then functionality is enhanced, but space for additional components is insufficient
Solution Approach 1:
The patent merges the TSP in Cell circuit with the AMOLED pixel unit circuit by sharing common data lines and control signals. The touch sensing module and light emitting module share the same data line for signal input, and the driving module serves dual purposes for both touch signal amplification and OLED driving, thereby eliminating the need for separate dedicated signal lines and reducing overall circuit area.
Solution Approach 2:
The driving module is designed with multi-functionality to serve both the touch sensing module and the light emitting module. It can amplify touch sensing signals and also drive the OLED pixel, reducing the need for separate dedicated circuits and minimizing the additional area required for integration.
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 the successful integration of a touch screen function into AMOLED displays, enhancing their functionality while maintaining the characteristics of rapid response and high contrast ratio.
Implementation Method 1
the sensor senses light using a photodiode D1 and generates electric leakage to detect a touch signal
Implementation Method 2
the sensor senses light using a sensitive capacitor C2 and detects the touch signal by the coupling of the sensitive capacitor and the change of the capacitor
Implementation Method 3
Thin-Film Transistor (TFT) T1 functions as an amplifying transistor to amplify the voltage change across D1 after detecting the touch signal, increase the capability to driving the output
Implementation Method 4
Active Matrix Organic Light Emitting Diode (AMOLED) has characteristics of rapider response, higher contrast ratio, and wider angle of view
Data Source
AI summary
The present invention provides an Active Matrix Organic Light Emitting Diode (AMOLED) pixel unit circuit, a display panel and an electronic product for integrating a touch screen circuit into the AMOLED pixel unit circuit and producing an AMOLED display panel having the functionality of a touch screen. The AMOLED pixel unit circuit comprises a driving module, configured to amplify a sensing signal generated by a touch sensing module, output the sensing signal through a sensing signal output module, and drive a light emitting module; the light emitting control module, configured to control the light emitting module to emit light; a threshold compensation module, configured to compensate a threshold voltage of the driving module; the touch sensing module, configured to generate the sensing signal and output the sensing signal to the driving module; and the sensing signal output module, configured to output the sensing signal amplified by the driving module.