Pixel Circuit With Floating Gate for Display Element Protection
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Solution Overview
Problem
Display elements in display devices, such as organic light-emitting diodes (OLEDs), are prone to damage during the aging process of the driving transistor, which affects the performance and longevity of the pixels.
Innovation Solution
A pixel design incorporating a first transistor with a floating second gate electrode, a storage capacitor, and transistors controlled by scan signals to manage voltage levels, along with a method of applying specific aging voltages to mitigate stress on the transistors and display elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving transistor undergoes aging process to improve stability, then the transistor performance is improved, but the display element is damaged
Solution Approach 1:
The gate electrode is divided into two separate gates: a first gate electrode and a second gate electrode. This segmentation allows independent control of voltage application to each gate, enabling the aging process to be applied to the transistor while protecting the display element through coordinated voltage control across the two gates.
Solution Approach 2:
The second gate electrode acts as an intermediary between the control circuit and the display element. By controlling the voltage at the second gate, the circuit can mediate the aging process to achieve transistor stabilization while preventing harmful effects from reaching the display element.
2Device complexity
If a conventional single-gate transistor structure is used, then the device complexity is low, but the display element is damaged during aging
Solution Approach 1:
The gate is segmented into two electrodes, which increases structural complexity but enables precise voltage control during aging processes, thereby protecting the display element from damage.
Solution Approach 2:
The patent adds a temporal dimension to the gate control by applying different voltages at different times during the aging process. The first gate receives aging voltage while the second gate receives protective voltage, creating a time-based control strategy that protects the display element.
3Reliability
If high voltage is applied to the gate during aging to improve transistor performance, then the transistor stability is improved, but the display element is damaged
Solution Approach 1:
By segmenting the gate into two electrodes, the patent enables differential voltage application where one gate can withstand high aging voltages while the other gate protects the display element from voltage-induced damage.
Solution Approach 2:
The patent changes the voltage parameters applied to different gates during the aging process. The first gate electrode receives high voltage for aging while the second gate electrode receives controlled voltage levels that prevent display element damage, thereby changing the electrical parameters to resolve the contradiction.
Data Source
AI summary
The disclosure provides a pixel and a method of aging the pixel for reducing or preventing damage to a display element during aging of a driving transistor, the pixel including a display element including an anode and a cathode, a first transistor configured to control a magnitude of a driving current flowing to the display element in response to a gate-source voltage, the first transistor including a first gate electrode configured to function as a gate of the first transistor, a semiconductor layer, and a second gate electrode in a floating state between the first gate electrode and the semiconductor layer, and a second transistor configured to deliver a first voltage to the first transistor in response to a first scan signal.