OLET Pixel Circuit for High Mobility Display Control
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Solution Overview
Problem
Existing display technologies, such as OLEDs, face limitations in carrier mobility and luminous efficiency, which can be addressed by utilizing an organic light-emitting transistor (OLET) with a circuit modulation function and light-emitting function, but require effective control mechanisms for optimal light emission and gray scale management.
Innovation Solution
A pixel circuit comprising an input sub-circuit, a light emission control sub-circuit, and an organic light-emitting transistor, where the input sub-circuit writes data signals into the light emission control sub-circuit under a gate scan signal, and the light emission control sub-circuit manages the control electrode voltage to drive the OLET for light emission, with additional mechanisms for pulse width modulation and AC voltage signals to control light emission intensity and duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If OLED is used for display, then light emission function is achieved, but carrier mobility is limited
Solution Approach 1:
The patent merges the circuit modulation function of OFET with the light-emitting function of OLED into a single organic light-emitting transistor (OLET) device, enabling both high carrier mobility and light emission in one component
2Loss of energy
If OLET is used to improve carrier mobility, then higher luminous efficiency is achieved, but control mechanism complexity increases
Solution Approach 1:
The pixel circuit is segmented into distinct functional modules: input sub-circuit for data writing, light emission control sub-circuit for voltage management, and light emission-off sub-circuit for PWM control, simplifying the overall control mechanism while maintaining high luminous efficiency
Solution Approach 2:
The patent implements dynamic control of the OLET through multiple sub-circuits that can independently adjust control electrode voltage and light emission duration based on display requirements, enabling flexible gray scale and brightness control
3Measurement precision
If precise control of light emission intensity is implemented, then gray scale management is improved, but device complexity increases
Solution Approach 1:
The patent employs pulse width modulation (PWM) technique where the light emission-off sub-circuit controls the OLET to emit light for specific time durations within each frame period, achieving precise gray scale control through temporal modulation rather than complex voltage control
Solution Approach 2:
The light emission control sub-circuit acts as an intermediary between the input sub-circuit and the OLET, managing control electrode voltage to ensure precise light emission intensity control while simplifying the overall control architecture
4Duration of action of stationary object
If AC voltage signal is applied to avoid unidirectional carrier movement, then OLET service life is extended, but power supply complexity increases
Solution Approach 1:
The second voltage terminal supplies AC voltage signals that periodically reverse polarity, preventing unidirectional carrier movement and accumulation in the OLET, thereby extending device service life through temporal variation in voltage polarity
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 enables higher carrier mobility and luminous efficiency, allowing for precise control of light emission intensity and gray scale, thereby improving the display performance and extending the service life of the OLETs by avoiding unidirectional carrier movement.
Implementation Method 1
an organic light-emitting transistor (OLET) has both a circuit modulation function of an organic field-effect transistor (OFET) and a light-emitting function of an organic light-emitting diode (OLED)
Data Source
AI summary
The present disclosure relates to a pixel circuit, a driving method therefor, and a display apparatus. The pixel circuit includes an input sub-circuit, a light emission control sub-circuit and an organic light-emitting transistor. The input sub-circuit is coupled to a gate line, a data line and the light emission control sub-circuit and writes a data signal supplied via the data line into the light emission control sub-circuit under control of a gate scan signal supplied via the gate line. The light emission control sub-circuit is coupled to a control electrode of the organic light-emitting transistor and controls a control electrode voltage of the organic light-emitting transistor according to a written data signal to drive the organic light-emitting transistor to emit light. With the pixel circuit according to embodiments of the present disclosure, active driving of an organic light-emitting transistor is achieved when it is applied in a display apparatus.